Validate preview sessions against real classpath and module-path fixtures

2026-11-12 09:47:59 +01:00
parent e97af99412
commit 28c1e47c95
52 changed files with 1867 additions and 9 deletions
@@ -0,0 +1,24 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+    <artifactId>preview-classpath</artifactId>
+    <version>1</version>
+  </parent>
+  <artifactId>app-classpath</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>de.neitzel.lib</groupId>
+      <artifactId>fx</artifactId>
+      <version>1.0-SNAPSHOT</version>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner</groupId>
+      <artifactId>designer-target-tools</artifactId>
+      <version>0.1.0-SNAPSHOT</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>
@@ -0,0 +1,51 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+public class Card extends javafx.scene.layout.VBox implements de.neitzel.fx.view.HasViewModel {
+  public final Greeting greeting;
+  private final javafx.beans.property.ObjectProperty<Object> model =
+      new javafx.beans.property.SimpleObjectProperty<>();
+  @javafx.fxml.FXML private javafx.scene.control.Label captionLabel;
+  @javafx.fxml.FXML private javafx.scene.control.TextField street;
+  public de.neitzel.fx.view.ViewModel received;
+  public boolean injected;
+
+  public Card(Greeting greeting) {
+    this.greeting = greeting;
+  }
+
+  @javafx.fxml.FXML
+  public void initialize() {
+    injected = true;
+    captionLabel.setText(greeting.prefix);
+  }
+
+  public String getCaption() {
+    return captionLabel.getText();
+  }
+
+  public void setCaption(String value) {
+    if (!injected) throw new IllegalStateException("Caption applied before injection");
+    captionLabel.setText(value);
+  }
+
+  public javafx.beans.property.ObjectProperty<Object> modelProperty() {
+    return model;
+  }
+
+  public Object getModel() {
+    return model.get();
+  }
+
+  public void setModel(Object value) {
+    model.set(value);
+  }
+
+  public void setViewModel(de.neitzel.fx.view.ViewModel vm) {
+    received = vm;
+  }
+
+  public javafx.scene.control.TextField street() {
+    return street;
+  }
+}
@@ -0,0 +1,16 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+public class Greeting implements AutoCloseable {
+  public final String identity = java.util.UUID.randomUUID().toString();
+  public String prefix = "sample";
+  public int closes;
+
+  public void close() {
+    closes++;
+  }
+
+  public String text() {
+    return prefix + "-" + identity;
+  }
+}
@@ -0,0 +1,22 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+@de.neitzel.fx.view.ViewModelClass(PersonViewModel.class)
+public class PersonController implements de.neitzel.fx.view.HasViewModel {
+  public final Greeting greeting;
+  public de.neitzel.fx.view.ViewModel received;
+
+  public PersonController(Greeting greeting) {
+    this.greeting = greeting;
+    System.setProperty("fixture.controllers", "constructed");
+  }
+
+  public void setViewModel(de.neitzel.fx.view.ViewModel vm) {
+    received = vm;
+  }
+
+  public String greeting() {
+    if (received == null) throw new IllegalStateException("No ViewModel before bindings");
+    return greeting.text();
+  }
+}
@@ -0,0 +1,7 @@
+package fixture.components;
+
+public class PersonViewModel extends de.neitzel.fx.view.ViewModel {
+  public PersonViewModel(Object model) {
+    super(model);
+  }
+}
@@ -0,0 +1,13 @@
+package fixture.model;
+
+public class Address {
+  private String street = "First Street";
+
+  public String getStreet() {
+    return street;
+  }
+
+  public void setStreet(String street) {
+    this.street = street;
+  }
+}
@@ -0,0 +1,28 @@
+package fixture.model;
+
+public class Person {
+  private String name = "Ada";
+  private Address home = new Address();
+
+  public Person() {
+    System.setProperty(
+        "fixture.models",
+        Integer.toString(Integer.parseInt(System.getProperty("fixture.models", "0")) + 1));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Address getHome() {
+    return home;
+  }
+
+  public void setHome(Address home) {
+    this.home = home;
+  }
+}
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?>
+ <fx:root type="javafx.scene.layout.VBox" xmlns:fx="http://javafx.com/fxml/1"><fx:define><BindingList><DirectBinding control="street" property="text" path="street" direction="both"/></BindingList></fx:define><Label fx:id="captionLabel"/><TextField fx:id="street"/></fx:root>
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import fixture.components.Card?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?><?import de.neitzel.fx.view.ComputedBinding?>
+ <VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fixture.components.PersonController" prefWidth="420" prefHeight="240"><fx:define><BindingList><DirectBinding control="name" property="text" path="name" direction="both"/><DirectBinding control="card" property="model" path="home" direction="both"/><DirectBinding control="second" property="model" path="home" direction="both"/><ComputedBinding control="greeting" property="text" method="#greeting"/></BindingList></fx:define><TextField fx:id="name"/><Label fx:id="greeting"/><Card fx:id="card" caption="FXML caption" prefWidth="not-a-number" alignment="CENTER_LEFT"/><Card fx:id="second" caption="Second"/></VBox>
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import fixture.components.Card?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?><?import de.neitzel.fx.view.ComputedBinding?>
+ <VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fixture.components.PersonController" prefWidth="420" prefHeight="240"><fx:define><BindingList><DirectBinding control="name" property="text" path="name" direction="both"/><DirectBinding control="card" property="model" path="home" direction="both"/><DirectBinding control="second" property="model" path="home" direction="both"/><ComputedBinding control="greeting" property="text" method="#greeting"/></BindingList></fx:define><TextField fx:id="name"/><Label fx:id="greeting"/><Card fx:id="card" caption="FXML caption" prefWidth="310" alignment="CENTER_LEFT"/><Card fx:id="second" caption="Second"/></VBox>
@@ -0,0 +1,197 @@
+package fixture.checks;
+
+import de.neitzel.fxdesigner.preview.*;
+import de.neitzel.fxdesigner.target.*;
+import fixture.components.*;
+import fixture.model.*;
+import fixture.preview.Examples;
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.*;
+import javafx.application.Platform;
+import javafx.geometry.Pos;
+import javafx.scene.control.*;
+
+public final class PreviewChecks {
+  static int checks;
+
+  static void check(boolean b, String message) {
+    if (!b) throw new AssertionError(message);
+    checks++;
+  }
+
+  static <T> T fx(Callable<T> action) throws Exception {
+    var result = new CompletableFuture<T>();
+    Platform.runLater(
+        () -> {
+          try {
+            result.complete(action.call());
+          } catch (Throwable e) {
+            result.completeExceptionally(e);
+          }
+        });
+    return result.get(10, TimeUnit.SECONDS);
+  }
+
+  static PreviewFailure failure(Throwable error) {
+    for (Throwable t = error; t != null; t = t.getCause())
+      if (t instanceof PreviewFailure f) return f;
+    throw new AssertionError("No structured preview diagnostic", error);
+  }
+
+  public static void main(String[] args) throws Exception {
+    String mode = args[0];
+    ClassLoader loader = PreviewChecks.class.getClassLoader();
+    var descriptors = ExampleCatalog.discover(loader);
+    check(descriptors.size() == 9, "Descriptor discovery");
+    check(
+        System.getProperty("fixture.provider.initialized") == null,
+        "Discovery initialized provider");
+    check(System.getProperty("fixture.models") == null, "Discovery constructed Model");
+    check(System.getProperty("fixture.controllers") == null, "Discovery constructed Controller");
+    if (mode.equals("discovery")) {
+      System.out.println("PASS discovery " + checks);
+      return;
+    }
+    var started = new CountDownLatch(1);
+    Platform.startup(
+        () -> {
+          Platform.setImplicitExit(false);
+          started.countDown();
+        });
+    check(started.await(10, TimeUnit.SECONDS), "FX startup");
+    TargetPreview preview = null;
+    try {
+      String id = mode.startsWith("missing-") ? "standard" : mode;
+      var descriptor =
+          descriptors.stream().filter(d -> d.id().equals(id)).findFirst().orElseThrow();
+      preview =
+          TargetPreview.open(
+              descriptor, loader, Duration.ofMillis(mode.equals("timeout") ? 2000 : 10000));
+      if (mode.equals("async") || mode.equals("cancel")) {
+        for (int i = 0; i < 100 && Examples.pending == null; i++) Thread.sleep(20);
+        check(Examples.pending != null, "Provider readiness created");
+        check(!preview.ready().toCompletableFuture().isDone(), "Premature readiness");
+        if (mode.equals("async")) Examples.pending.complete(null);
+        else preview.cancel();
+      }
+      if (java.util.Set.of(
+              "timeout",
+              "cancel",
+              "readiness-failure",
+              "wrong-model",
+              "invalid-attribute",
+              "factory-failure",
+              "missing-components",
+              "missing-model")
+          .contains(mode)) {
+        try {
+          preview.ready().toCompletableFuture().get(15, TimeUnit.SECONDS);
+          throw new AssertionError("Failure accepted: " + mode);
+        } catch (ExecutionException error) {
+          var f = failure(error);
+          var expected =
+              switch (mode) {
+                case "timeout" -> PreviewFailure.Code.TIMEOUT;
+                case "cancel" -> PreviewFailure.Code.CANCELLED;
+                case "readiness-failure" -> PreviewFailure.Code.READINESS;
+                case "wrong-model" -> PreviewFailure.Code.MODEL_TYPE;
+                case "missing-components", "missing-model" -> PreviewFailure.Code.MODULE_ACCESS;
+                default -> PreviewFailure.Code.LOAD;
+              };
+          check(f.code() == expected, "Wrong diagnostic: " + f.code() + " expected " + expected);
+        }
+        preview.cleanup().toCompletableFuture().get(5, TimeUnit.SECONDS);
+        if (!mode.equals("missing-components")) {
+          check(Examples.service.closes == 1, "Failure did not clean services once");
+          if (!mode.equals("factory-failure"))
+            check(Examples.closes == 1, "Session cleanup missing");
+        }
+      } else {
+        TargetPreview ready = preview.ready().toCompletableFuture().get(15, TimeUnit.SECONDS);
+        fx(
+            () -> {
+              var view = ready.loadedView();
+              check(view.getViewModel() instanceof PersonViewModel, "Named ViewModel not selected");
+              var controller = Examples.context.getComponent(PersonController.class);
+              check(controller.received == view.getViewModel(), "Controller ViewModel handoff");
+              check(controller.greeting == Examples.service, "Configured service not injected");
+              var card = (Card) view.getRoot().lookup("#card");
+              var second = (Card) view.getRoot().lookup("#second");
+              check(card != second, "Component instances reused");
+              check(
+                  card.getModel() == Examples.person.getHome()
+                      && second.getModel() == card.getModel(),
+                  "Nested Model identity not shared");
+              check(card.received == second.received, "Nested ViewModel identity changed");
+              check(
+                  card.greeting == Examples.service && second.greeting == Examples.service,
+                  "Component injection");
+              check(card.getCaption().equals("FXML caption"), "Custom caption lost");
+              check(
+                  card.getPrefWidth() == 310 && card.getAlignment() == Pos.CENTER_LEFT,
+                  "Inherited/coerced attributes lost");
+              check(card.injected, "Component initialization");
+              TextField name = (TextField) view.getRoot().lookup("#name");
+              check(name.getText().equals("Ada"), "Initial parent binding");
+              name.setText("Grace");
+              check(Examples.person.getName().equals("Grace"), "Parent write-back");
+              card.street().setText("Changed Street");
+              check(
+                  Examples.person.getHome().getStreet().equals("Changed Street")
+                      && second.street().getText().equals("Changed Street"),
+                  "Component write-back and shared Model");
+              check(
+                  ((Label) view.getRoot().lookup("#greeting")).getText().startsWith("configured-"),
+                  "Computed controller binding");
+              byte[] rgba = ready.render(420, 240);
+              check(rgba.length == 420 * 240 * 4, "Render size");
+              boolean nonzero = false;
+              for (byte value : rgba)
+                if (value != 0) {
+                  nonzero = true;
+                  break;
+                }
+              check(nonzero, "Blank rendering");
+              try {
+                ready.render(8192, 8192);
+                throw new AssertionError("Oversized image allowed");
+              } catch (IllegalArgumentException expected) {
+                checks++;
+              }
+              return null;
+            });
+        System.out.println(
+            "SESSION "
+                + Examples.service.identity
+                + " models="
+                + System.getProperty("fixture.models"));
+        preview.close();
+        try {
+          preview.cleanup().toCompletableFuture().get(5, TimeUnit.SECONDS);
+          check(!mode.equals("cleanup-failure"), "Cleanup failure hidden");
+        } catch (ExecutionException error) {
+          check(
+              mode.equals("cleanup-failure")
+                  && failure(error).code() == PreviewFailure.Code.CLEANUP,
+              "Wrong cleanup diagnostic");
+        }
+        check(
+            Examples.closes == 1 && Examples.service.closes == 1,
+            "Owned resources not cleaned exactly once");
+        preview.close();
+        check(Examples.closes == 1, "Repeated close cleaned twice");
+      }
+      try {
+        TargetPreview.open(descriptor, loader, Duration.ofSeconds(1));
+        throw new AssertionError("Process session reused");
+      } catch (PreviewFailure e) {
+        check(e.code() == PreviewFailure.Code.SESSION_REUSE, "Wrong reuse diagnostic");
+      }
+      System.out.println("PASS " + mode + " " + checks);
+    } finally {
+      if (preview != null) preview.close();
+      Platform.exit();
+    }
+  }
+}
@@ -0,0 +1,62 @@
+package fixture.preview;
+
+import de.neitzel.fxdesigner.preview.*;
+import de.neitzel.injection.ApplicationContext;
+import fixture.components.*;
+import fixture.model.Person;
+import java.util.concurrent.*;
+
+public final class Examples implements PreviewProvider<Person, ApplicationContext> {
+  static {
+    System.setProperty("fixture.provider.initialized", "true");
+  }
+
+  public static Person person;
+  public static ApplicationContext context;
+  public static Greeting service;
+  public static volatile CompletableFuture<Void> pending;
+  public static int closes;
+
+  public Class<Person> modelType() {
+    return Person.class;
+  }
+
+  public PreviewSession<Person, ApplicationContext> open(String id) throws Exception {
+    if (!javafx.application.Platform.isFxApplicationThread())
+      throw new AssertionError("Provider not on FX");
+    person = new Person();
+    context = new ApplicationContext("fixture.components");
+    service = context.getComponent(Greeting.class);
+    service.prefix = "configured";
+    if (id.equals("factory-failure")) {
+      service.close();
+      throw new IllegalStateException("Factory failed after cleaning partial resources");
+    }
+    pending = new CompletableFuture<>();
+    if (!java.util.Set.of("async", "timeout", "cancel", "readiness-failure").contains(id))
+      pending.complete(null);
+    return new PreviewSession<>() {
+      public Person model() {
+        return id.equals("wrong-model") ? null : person;
+      }
+
+      public ApplicationContext context() {
+        return context;
+      }
+
+      public CompletionStage<Void> ready() {
+        if (id.equals("readiness-failure"))
+          return CompletableFuture.failedFuture(new IllegalStateException("Readiness failed"));
+        return pending;
+      }
+
+      public void close() {
+        if (!javafx.application.Platform.isFxApplicationThread())
+          throw new AssertionError("Cleanup not on FX");
+        closes++;
+        service.close();
+        if (id.equals("cleanup-failure")) throw new IllegalStateException("Cleanup failure");
+      }
+    };
+  }
+}
@@ -0,0 +1,56 @@
+format=1
+count=9
+example.0.id=standard
+example.0.label=standard
+example.0.modelType=fixture.model.Person
+example.0.providerClass=fixture.preview.Examples
+example.0.viewResource=fixture/components/Person.fxml
+example.0.componentPackage=fixture.components
+example.1.id=async
+example.1.label=async
+example.1.modelType=fixture.model.Person
+example.1.providerClass=fixture.preview.Examples
+example.1.viewResource=fixture/components/Person.fxml
+example.1.componentPackage=fixture.components
+example.2.id=timeout
+example.2.label=timeout
+example.2.modelType=fixture.model.Person
+example.2.providerClass=fixture.preview.Examples
+example.2.viewResource=fixture/components/Person.fxml
+example.2.componentPackage=fixture.components
+example.3.id=cancel
+example.3.label=cancel
+example.3.modelType=fixture.model.Person
+example.3.providerClass=fixture.preview.Examples
+example.3.viewResource=fixture/components/Person.fxml
+example.3.componentPackage=fixture.components
+example.4.id=readiness-failure
+example.4.label=readiness-failure
+example.4.modelType=fixture.model.Person
+example.4.providerClass=fixture.preview.Examples
+example.4.viewResource=fixture/components/Person.fxml
+example.4.componentPackage=fixture.components
+example.5.id=wrong-model
+example.5.label=wrong-model
+example.5.modelType=fixture.model.Person
+example.5.providerClass=fixture.preview.Examples
+example.5.viewResource=fixture/components/Person.fxml
+example.5.componentPackage=fixture.components
+example.6.id=invalid-attribute
+example.6.label=invalid-attribute
+example.6.modelType=fixture.model.Person
+example.6.providerClass=fixture.preview.Examples
+example.6.viewResource=fixture/components/Invalid.fxml
+example.6.componentPackage=fixture.components
+example.7.id=cleanup-failure
+example.7.label=cleanup-failure
+example.7.modelType=fixture.model.Person
+example.7.providerClass=fixture.preview.Examples
+example.7.viewResource=fixture/components/Person.fxml
+example.7.componentPackage=fixture.components
+example.8.id=factory-failure
+example.8.label=factory-failure
+example.8.modelType=fixture.model.Person
+example.8.providerClass=fixture.preview.Examples
+example.8.viewResource=fixture/components/Person.fxml
+example.8.componentPackage=fixture.components
@@ -0,0 +1,15 @@
+{
+  "schemaVersion": "1.0",
+  "contexts": {
+    "fixture": {
+      "applicationModule": "app",
+      "launchMode": "classpath",
+      "buildRuntime": "java21",
+      "targetRuntime": "java21",
+      "preview": {
+        "sourceSet": "test",
+        "provider": "fixture.preview.Examples"
+      }
+    }
+  }
+}
@@ -0,0 +1,41 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+  <artifactId>preview-classpath</artifactId>
+  <version>1</version>
+  <packaging>pom</packaging>
+  <modules>
+    <module>app</module>
+  </modules>
+  <properties>
+    <maven.compiler.release>21</maven.compiler.release>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.14.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.3.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>3.5.4</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.4.2</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>
@@ -0,0 +1,18 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+    <artifactId>preview-fixture-modulepath</artifactId>
+    <version>1</version>
+  </parent>
+  <artifactId>app-modulepath</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>de.neitzel.lib</groupId>
+      <artifactId>fx</artifactId>
+      <version>1.0-SNAPSHOT</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+</project>
@@ -0,0 +1,51 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+public class Card extends javafx.scene.layout.VBox implements de.neitzel.fx.view.HasViewModel {
+  public final Greeting greeting;
+  private final javafx.beans.property.ObjectProperty<Object> model =
+      new javafx.beans.property.SimpleObjectProperty<>();
+  @javafx.fxml.FXML private javafx.scene.control.Label captionLabel;
+  @javafx.fxml.FXML private javafx.scene.control.TextField street;
+  public de.neitzel.fx.view.ViewModel received;
+  public boolean injected;
+
+  public Card(Greeting greeting) {
+    this.greeting = greeting;
+  }
+
+  @javafx.fxml.FXML
+  public void initialize() {
+    injected = true;
+    captionLabel.setText(greeting.prefix);
+  }
+
+  public String getCaption() {
+    return captionLabel.getText();
+  }
+
+  public void setCaption(String value) {
+    if (!injected) throw new IllegalStateException("Caption applied before injection");
+    captionLabel.setText(value);
+  }
+
+  public javafx.beans.property.ObjectProperty<Object> modelProperty() {
+    return model;
+  }
+
+  public Object getModel() {
+    return model.get();
+  }
+
+  public void setModel(Object value) {
+    model.set(value);
+  }
+
+  public void setViewModel(de.neitzel.fx.view.ViewModel vm) {
+    received = vm;
+  }
+
+  public javafx.scene.control.TextField street() {
+    return street;
+  }
+}
@@ -0,0 +1,16 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+public class Greeting implements AutoCloseable {
+  public final String identity = java.util.UUID.randomUUID().toString();
+  public String prefix = "sample";
+  public int closes;
+
+  public void close() {
+    closes++;
+  }
+
+  public String text() {
+    return prefix + "-" + identity;
+  }
+}
@@ -0,0 +1,22 @@
+package fixture.components;
+
+@jakarta.inject.Singleton
+@de.neitzel.fx.view.ViewModelClass(PersonViewModel.class)
+public class PersonController implements de.neitzel.fx.view.HasViewModel {
+  public final Greeting greeting;
+  public de.neitzel.fx.view.ViewModel received;
+
+  public PersonController(Greeting greeting) {
+    this.greeting = greeting;
+    System.setProperty("fixture.controllers", "constructed");
+  }
+
+  public void setViewModel(de.neitzel.fx.view.ViewModel vm) {
+    received = vm;
+  }
+
+  public String greeting() {
+    if (received == null) throw new IllegalStateException("No ViewModel before bindings");
+    return greeting.text();
+  }
+}
@@ -0,0 +1,7 @@
+package fixture.components;
+
+public class PersonViewModel extends de.neitzel.fx.view.ViewModel {
+  public PersonViewModel(Object model) {
+    super(model);
+  }
+}
@@ -0,0 +1,13 @@
+package fixture.model;
+
+public class Address {
+  private String street = "First Street";
+
+  public String getStreet() {
+    return street;
+  }
+
+  public void setStreet(String street) {
+    this.street = street;
+  }
+}
@@ -0,0 +1,28 @@
+package fixture.model;
+
+public class Person {
+  private String name = "Ada";
+  private Address home = new Address();
+
+  public Person() {
+    System.setProperty(
+        "fixture.models",
+        Integer.toString(Integer.parseInt(System.getProperty("fixture.models", "0")) + 1));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Address getHome() {
+    return home;
+  }
+
+  public void setHome(Address home) {
+    this.home = home;
+  }
+}
@@ -0,0 +1,18 @@
+module fixture.app {
+  requires fx;
+  requires injection;
+  requires jakarta.inject;
+  requires javafx.controls;
+  requires javafx.fxml;
+
+  exports fixture.model to
+      fixture.preview,
+      fixture.checks;
+  exports fixture.components to
+      fixture.preview,
+      fixture.checks;
+
+  opens fixture.components;
+  opens fixture.model to
+      fx;
+}
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?>
+ <fx:root type="javafx.scene.layout.VBox" xmlns:fx="http://javafx.com/fxml/1"><fx:define><BindingList><DirectBinding control="street" property="text" path="street" direction="both"/></BindingList></fx:define><Label fx:id="captionLabel"/><TextField fx:id="street"/></fx:root>
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import fixture.components.Card?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?><?import de.neitzel.fx.view.ComputedBinding?>
+ <VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fixture.components.PersonController" prefWidth="420" prefHeight="240"><fx:define><BindingList><DirectBinding control="name" property="text" path="name" direction="both"/><DirectBinding control="card" property="model" path="home" direction="both"/><DirectBinding control="second" property="model" path="home" direction="both"/><ComputedBinding control="greeting" property="text" method="#greeting"/></BindingList></fx:define><TextField fx:id="name"/><Label fx:id="greeting"/><Card fx:id="card" caption="FXML caption" prefWidth="not-a-number" alignment="CENTER_LEFT"/><Card fx:id="second" caption="Second"/></VBox>
@@ -0,0 +1,2 @@
+<?import javafx.scene.layout.VBox?><?import javafx.scene.control.Label?><?import javafx.scene.control.TextField?><?import fixture.components.Card?><?import de.neitzel.fx.view.BindingList?><?import de.neitzel.fx.view.DirectBinding?><?import de.neitzel.fx.view.ComputedBinding?>
+ <VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fixture.components.PersonController" prefWidth="420" prefHeight="240"><fx:define><BindingList><DirectBinding control="name" property="text" path="name" direction="both"/><DirectBinding control="card" property="model" path="home" direction="both"/><DirectBinding control="second" property="model" path="home" direction="both"/><ComputedBinding control="greeting" property="text" method="#greeting"/></BindingList></fx:define><TextField fx:id="name"/><Label fx:id="greeting"/><Card fx:id="card" caption="FXML caption" prefWidth="310" alignment="CENTER_LEFT"/><Card fx:id="second" caption="Second"/></VBox>
@@ -0,0 +1,24 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+    <artifactId>preview-fixture-modulepath</artifactId>
+    <version>1</version>
+  </parent>
+  <artifactId>checks-modulepath</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+      <artifactId>preview-modulepath</artifactId>
+      <version>1</version>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner</groupId>
+      <artifactId>designer-target-tools</artifactId>
+      <version>0.1.0-SNAPSHOT</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+</project>
@@ -0,0 +1,197 @@
+package fixture.checks;
+
+import de.neitzel.fxdesigner.preview.*;
+import de.neitzel.fxdesigner.target.*;
+import fixture.components.*;
+import fixture.model.*;
+import fixture.preview.Examples;
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.*;
+import javafx.application.Platform;
+import javafx.geometry.Pos;
+import javafx.scene.control.*;
+
+public final class PreviewChecks {
+  static int checks;
+
+  static void check(boolean b, String message) {
+    if (!b) throw new AssertionError(message);
+    checks++;
+  }
+
+  static <T> T fx(Callable<T> action) throws Exception {
+    var result = new CompletableFuture<T>();
+    Platform.runLater(
+        () -> {
+          try {
+            result.complete(action.call());
+          } catch (Throwable e) {
+            result.completeExceptionally(e);
+          }
+        });
+    return result.get(10, TimeUnit.SECONDS);
+  }
+
+  static PreviewFailure failure(Throwable error) {
+    for (Throwable t = error; t != null; t = t.getCause())
+      if (t instanceof PreviewFailure f) return f;
+    throw new AssertionError("No structured preview diagnostic", error);
+  }
+
+  public static void main(String[] args) throws Exception {
+    String mode = args[0];
+    ClassLoader loader = PreviewChecks.class.getClassLoader();
+    var descriptors = ExampleCatalog.discover(loader);
+    check(descriptors.size() == 9, "Descriptor discovery");
+    check(
+        System.getProperty("fixture.provider.initialized") == null,
+        "Discovery initialized provider");
+    check(System.getProperty("fixture.models") == null, "Discovery constructed Model");
+    check(System.getProperty("fixture.controllers") == null, "Discovery constructed Controller");
+    if (mode.equals("discovery")) {
+      System.out.println("PASS discovery " + checks);
+      return;
+    }
+    var started = new CountDownLatch(1);
+    Platform.startup(
+        () -> {
+          Platform.setImplicitExit(false);
+          started.countDown();
+        });
+    check(started.await(10, TimeUnit.SECONDS), "FX startup");
+    TargetPreview preview = null;
+    try {
+      String id = mode.startsWith("missing-") ? "standard" : mode;
+      var descriptor =
+          descriptors.stream().filter(d -> d.id().equals(id)).findFirst().orElseThrow();
+      preview =
+          TargetPreview.open(
+              descriptor, loader, Duration.ofMillis(mode.equals("timeout") ? 2000 : 10000));
+      if (mode.equals("async") || mode.equals("cancel")) {
+        for (int i = 0; i < 100 && Examples.pending == null; i++) Thread.sleep(20);
+        check(Examples.pending != null, "Provider readiness created");
+        check(!preview.ready().toCompletableFuture().isDone(), "Premature readiness");
+        if (mode.equals("async")) Examples.pending.complete(null);
+        else preview.cancel();
+      }
+      if (java.util.Set.of(
+              "timeout",
+              "cancel",
+              "readiness-failure",
+              "wrong-model",
+              "invalid-attribute",
+              "factory-failure",
+              "missing-components",
+              "missing-model")
+          .contains(mode)) {
+        try {
+          preview.ready().toCompletableFuture().get(15, TimeUnit.SECONDS);
+          throw new AssertionError("Failure accepted: " + mode);
+        } catch (ExecutionException error) {
+          var f = failure(error);
+          var expected =
+              switch (mode) {
+                case "timeout" -> PreviewFailure.Code.TIMEOUT;
+                case "cancel" -> PreviewFailure.Code.CANCELLED;
+                case "readiness-failure" -> PreviewFailure.Code.READINESS;
+                case "wrong-model" -> PreviewFailure.Code.MODEL_TYPE;
+                case "missing-components", "missing-model" -> PreviewFailure.Code.MODULE_ACCESS;
+                default -> PreviewFailure.Code.LOAD;
+              };
+          check(f.code() == expected, "Wrong diagnostic: " + f.code() + " expected " + expected);
+        }
+        preview.cleanup().toCompletableFuture().get(5, TimeUnit.SECONDS);
+        if (!mode.equals("missing-components")) {
+          check(Examples.service.closes == 1, "Failure did not clean services once");
+          if (!mode.equals("factory-failure"))
+            check(Examples.closes == 1, "Session cleanup missing");
+        }
+      } else {
+        TargetPreview ready = preview.ready().toCompletableFuture().get(15, TimeUnit.SECONDS);
+        fx(
+            () -> {
+              var view = ready.loadedView();
+              check(view.getViewModel() instanceof PersonViewModel, "Named ViewModel not selected");
+              var controller = Examples.context.getComponent(PersonController.class);
+              check(controller.received == view.getViewModel(), "Controller ViewModel handoff");
+              check(controller.greeting == Examples.service, "Configured service not injected");
+              var card = (Card) view.getRoot().lookup("#card");
+              var second = (Card) view.getRoot().lookup("#second");
+              check(card != second, "Component instances reused");
+              check(
+                  card.getModel() == Examples.person.getHome()
+                      && second.getModel() == card.getModel(),
+                  "Nested Model identity not shared");
+              check(card.received == second.received, "Nested ViewModel identity changed");
+              check(
+                  card.greeting == Examples.service && second.greeting == Examples.service,
+                  "Component injection");
+              check(card.getCaption().equals("FXML caption"), "Custom caption lost");
+              check(
+                  card.getPrefWidth() == 310 && card.getAlignment() == Pos.CENTER_LEFT,
+                  "Inherited/coerced attributes lost");
+              check(card.injected, "Component initialization");
+              TextField name = (TextField) view.getRoot().lookup("#name");
+              check(name.getText().equals("Ada"), "Initial parent binding");
+              name.setText("Grace");
+              check(Examples.person.getName().equals("Grace"), "Parent write-back");
+              card.street().setText("Changed Street");
+              check(
+                  Examples.person.getHome().getStreet().equals("Changed Street")
+                      && second.street().getText().equals("Changed Street"),
+                  "Component write-back and shared Model");
+              check(
+                  ((Label) view.getRoot().lookup("#greeting")).getText().startsWith("configured-"),
+                  "Computed controller binding");
+              byte[] rgba = ready.render(420, 240);
+              check(rgba.length == 420 * 240 * 4, "Render size");
+              boolean nonzero = false;
+              for (byte value : rgba)
+                if (value != 0) {
+                  nonzero = true;
+                  break;
+                }
+              check(nonzero, "Blank rendering");
+              try {
+                ready.render(8192, 8192);
+                throw new AssertionError("Oversized image allowed");
+              } catch (IllegalArgumentException expected) {
+                checks++;
+              }
+              return null;
+            });
+        System.out.println(
+            "SESSION "
+                + Examples.service.identity
+                + " models="
+                + System.getProperty("fixture.models"));
+        preview.close();
+        try {
+          preview.cleanup().toCompletableFuture().get(5, TimeUnit.SECONDS);
+          check(!mode.equals("cleanup-failure"), "Cleanup failure hidden");
+        } catch (ExecutionException error) {
+          check(
+              mode.equals("cleanup-failure")
+                  && failure(error).code() == PreviewFailure.Code.CLEANUP,
+              "Wrong cleanup diagnostic");
+        }
+        check(
+            Examples.closes == 1 && Examples.service.closes == 1,
+            "Owned resources not cleaned exactly once");
+        preview.close();
+        check(Examples.closes == 1, "Repeated close cleaned twice");
+      }
+      try {
+        TargetPreview.open(descriptor, loader, Duration.ofSeconds(1));
+        throw new AssertionError("Process session reused");
+      } catch (PreviewFailure e) {
+        check(e.code() == PreviewFailure.Code.SESSION_REUSE, "Wrong reuse diagnostic");
+      }
+      System.out.println("PASS " + mode + " " + checks);
+    } finally {
+      if (preview != null) preview.close();
+      Platform.exit();
+    }
+  }
+}
@@ -0,0 +1,10 @@
+module fixture.checks {
+  requires fixture.app;
+  requires fixture.preview;
+  requires de.neitzel.fxdesigner.target;
+  requires de.neitzel.fxdesigner.preview;
+  requires fx;
+  requires injection;
+  requires javafx.controls;
+  requires javafx.fxml;
+}
@@ -0,0 +1,19 @@
+{
+  "schemaVersion": "1.0",
+  "contexts": {
+    "fixture": {
+      "applicationModule": "app",
+      "launchMode": "module-path",
+      "buildRuntime": "java21",
+      "targetRuntime": "java21",
+      "preview": {
+        "sourceSet": "module",
+        "module": "preview",
+        "provider": "fixture.preview.Examples"
+      },
+      "modulePath": {
+        "entryModule": "fixture.checks"
+      }
+    }
+  }
+}
@@ -0,0 +1,43 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+  <artifactId>preview-fixture-modulepath</artifactId>
+  <version>1</version>
+  <packaging>pom</packaging>
+  <modules>
+    <module>app</module>
+    <module>preview</module>
+    <module>checks</module>
+  </modules>
+  <properties>
+    <maven.compiler.release>21</maven.compiler.release>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.14.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.3.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>3.5.4</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.4.2</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>
@@ -0,0 +1,24 @@
+<?xml version="1.0" ?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+    <artifactId>preview-fixture-modulepath</artifactId>
+    <version>1</version>
+  </parent>
+  <artifactId>preview-modulepath</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner.fixtures</groupId>
+      <artifactId>app-modulepath</artifactId>
+      <version>1</version>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner</groupId>
+      <artifactId>designer-preview-api</artifactId>
+      <version>0.1.0-SNAPSHOT</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+</project>
@@ -0,0 +1,62 @@
+package fixture.preview;
+
+import de.neitzel.fxdesigner.preview.*;
+import de.neitzel.injection.ApplicationContext;
+import fixture.components.*;
+import fixture.model.Person;
+import java.util.concurrent.*;
+
+public final class Examples implements PreviewProvider<Person, ApplicationContext> {
+  static {
+    System.setProperty("fixture.provider.initialized", "true");
+  }
+
+  public static Person person;
+  public static ApplicationContext context;
+  public static Greeting service;
+  public static volatile CompletableFuture<Void> pending;
+  public static int closes;
+
+  public Class<Person> modelType() {
+    return Person.class;
+  }
+
+  public PreviewSession<Person, ApplicationContext> open(String id) throws Exception {
+    if (!javafx.application.Platform.isFxApplicationThread())
+      throw new AssertionError("Provider not on FX");
+    person = new Person();
+    context = new ApplicationContext("fixture.components");
+    service = context.getComponent(Greeting.class);
+    service.prefix = "configured";
+    if (id.equals("factory-failure")) {
+      service.close();
+      throw new IllegalStateException("Factory failed after cleaning partial resources");
+    }
+    pending = new CompletableFuture<>();
+    if (!java.util.Set.of("async", "timeout", "cancel", "readiness-failure").contains(id))
+      pending.complete(null);
+    return new PreviewSession<>() {
+      public Person model() {
+        return id.equals("wrong-model") ? null : person;
+      }
+
+      public ApplicationContext context() {
+        return context;
+      }
+
+      public CompletionStage<Void> ready() {
+        if (id.equals("readiness-failure"))
+          return CompletableFuture.failedFuture(new IllegalStateException("Readiness failed"));
+        return pending;
+      }
+
+      public void close() {
+        if (!javafx.application.Platform.isFxApplicationThread())
+          throw new AssertionError("Cleanup not on FX");
+        closes++;
+        service.close();
+        if (id.equals("cleanup-failure")) throw new IllegalStateException("Cleanup failure");
+      }
+    };
+  }
+}
@@ -0,0 +1,10 @@
+module fixture.preview {
+  requires fixture.app;
+  requires injection;
+  requires javafx.graphics;
+  requires de.neitzel.fxdesigner.preview;
+
+  exports fixture.preview to
+      fixture.checks,
+      de.neitzel.fxdesigner.target;
+}
@@ -0,0 +1,56 @@
+format=1
+count=9
+example.0.id=standard
+example.0.label=standard
+example.0.modelType=fixture.model.Person
+example.0.providerClass=fixture.preview.Examples
+example.0.viewResource=fixture/components/Person.fxml
+example.0.componentPackage=fixture.components
+example.1.id=async
+example.1.label=async
+example.1.modelType=fixture.model.Person
+example.1.providerClass=fixture.preview.Examples
+example.1.viewResource=fixture/components/Person.fxml
+example.1.componentPackage=fixture.components
+example.2.id=timeout
+example.2.label=timeout
+example.2.modelType=fixture.model.Person
+example.2.providerClass=fixture.preview.Examples
+example.2.viewResource=fixture/components/Person.fxml
+example.2.componentPackage=fixture.components
+example.3.id=cancel
+example.3.label=cancel
+example.3.modelType=fixture.model.Person
+example.3.providerClass=fixture.preview.Examples
+example.3.viewResource=fixture/components/Person.fxml
+example.3.componentPackage=fixture.components
+example.4.id=readiness-failure
+example.4.label=readiness-failure
+example.4.modelType=fixture.model.Person
+example.4.providerClass=fixture.preview.Examples
+example.4.viewResource=fixture/components/Person.fxml
+example.4.componentPackage=fixture.components
+example.5.id=wrong-model
+example.5.label=wrong-model
+example.5.modelType=fixture.model.Person
+example.5.providerClass=fixture.preview.Examples
+example.5.viewResource=fixture/components/Person.fxml
+example.5.componentPackage=fixture.components
+example.6.id=invalid-attribute
+example.6.label=invalid-attribute
+example.6.modelType=fixture.model.Person
+example.6.providerClass=fixture.preview.Examples
+example.6.viewResource=fixture/components/Invalid.fxml
+example.6.componentPackage=fixture.components
+example.7.id=cleanup-failure
+example.7.label=cleanup-failure
+example.7.modelType=fixture.model.Person
+example.7.providerClass=fixture.preview.Examples
+example.7.viewResource=fixture/components/Person.fxml
+example.7.componentPackage=fixture.components
+example.8.id=factory-failure
+example.8.label=factory-failure
+example.8.modelType=fixture.model.Person
+example.8.providerClass=fixture.preview.Examples
+example.8.viewResource=fixture/components/Person.fxml
+example.8.componentPackage=fixture.components