Feature/issue 373 improve testing for jupiter

docs/junit5.adoc

@@ -74,6 +74,7 @@ public class JGiven5ScenarioTest
     }
 }
 ----
+Please note that JGiven is built around each scenario, i.e. test method, having its own test instance. Therefore, we cannot support JUnit's per-class test instance lifecycle. An exception will be thrown if any such attempt is made.
 
 === Example Project
 

jgiven-junit5/src/main/java/com/tngtech/jgiven/junit5/JGivenExtension.java

@@ -3,20 +3,25 @@
 import static com.tngtech.jgiven.report.model.ExecutionStatus.FAILED;
 import static com.tngtech.jgiven.report.model.ExecutionStatus.SUCCESS;
 
-import java.util.EnumSet;
-
-import org.junit.jupiter.api.Assumptions;
-import org.junit.jupiter.api.Tag;
-import org.junit.jupiter.api.extension.*;
-import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
-
 import com.tngtech.jgiven.base.ScenarioTestBase;
 import com.tngtech.jgiven.config.AbstractJGivenConfiguration;
 import com.tngtech.jgiven.config.ConfigurationUtil;
+import com.tngtech.jgiven.exception.JGivenWrongUsageException;
 import com.tngtech.jgiven.impl.ScenarioBase;
 import com.tngtech.jgiven.impl.ScenarioHolder;
 import com.tngtech.jgiven.report.impl.CommonReportHelper;
 import com.tngtech.jgiven.report.model.ReportModel;
+import java.util.EnumSet;
+import org.junit.jupiter.api.Assumptions;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.extension.AfterAllCallback;
+import org.junit.jupiter.api.extension.AfterTestExecutionCallback;
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
+import org.junit.jupiter.api.extension.TestInstancePostProcessor;
 
 /**
  * This extension enables JGiven for JUnit 5 Tests.
@@ -39,14 +44,16 @@ public class JGivenExtension implements
     BeforeAllCallback,
     AfterAllCallback,
     BeforeEachCallback,
-    AfterEachCallback {
+    AfterTestExecutionCallback {
 
     private static final Namespace NAMESPACE = Namespace.create("com.tngtech.jgiven");
 
     private static final String REPORT_MODEL = "report-model";
 
     @Override
     public void beforeAll(ExtensionContext context) {
+        validatePerMethodLifecycle(context);
+
         ReportModel reportModel = new ReportModel();
         reportModel.setTestClass(context.getTestClass().get());
         if (!context.getDisplayName().equals(context.getTestClass().get().getSimpleName())) {
@@ -62,6 +69,7 @@ public void beforeAll(ExtensionContext context) {
         }
     }
 
+
     @Override
     public void afterAll(ExtensionContext context) {
         ScenarioHolder.get().removeScenarioOfCurrentThread();
@@ -75,7 +83,7 @@ public void beforeEach(ExtensionContext context) {
     }
 
     @Override
-    public void afterEach(ExtensionContext context) throws Exception {
+    public void afterTestExecution(ExtensionContext context) throws Exception {
         ScenarioBase scenario = getScenario();
         try {
             if (context.getExecutionException().isPresent()) {
@@ -96,10 +104,6 @@ public void afterEach(ExtensionContext context) throws Exception {
         }
     }
 
-    private ScenarioBase getScenario() {
-        return ScenarioHolder.get().getScenarioOfCurrentThread();
-    }
-
     @Override
     public void postProcessTestInstance(Object testInstance, ExtensionContext context) {
         ScenarioBase currentScenario = ScenarioHolder.get().getScenarioOfCurrentThread();
@@ -125,4 +129,21 @@ public void postProcessTestInstance(Object testInstance, ExtensionContext contex
         scenario.getExecutor().readScenarioState(testInstance);
     }
 
+    private void validatePerMethodLifecycle(ExtensionContext context) {
+        if (isPerClassLifecycle(context)) {
+            throw new JGivenWrongUsageException(
+                "JGiven does not support keeping a test instance over multiple scenarios. Please use Lifecycle '"
+                    + TestInstance.Lifecycle.PER_METHOD + "'.");
+        }
+    }
+
+    private boolean isPerClassLifecycle(ExtensionContext context) {
+        return context.getTestInstanceLifecycle()
+            .filter(lifecycle -> TestInstance.Lifecycle.PER_CLASS == lifecycle)
+            .isPresent();
+    }
+
+    private ScenarioBase getScenario() {
+        return ScenarioHolder.get().getScenarioOfCurrentThread();
+    }
 }

jgiven-tests/build.gradle

@@ -3,8 +3,12 @@ description = 'JGiven Tests - Contains BDD tests for JGiven written in JGiven'
 dependencies {
     implementation project(':jgiven-junit')
     implementation project(':jgiven-testng')
+    implementation project(':jgiven-junit5')
     implementation project(':jgiven-html5-report')
     implementation "junit:junit:$junitVersion"
+    implementation "org.junit.jupiter:junit-jupiter-api:5.8.2"
+    implementation "org.junit.jupiter:junit-jupiter-engine:5.8.2"
+    implementation "org.junit.platform:junit-platform-runner:1.8.2"
     implementation "org.testng:testng:$testngVersion"
     implementation "com.tngtech.java:junit-dataprovider:$junitDataproviderVersion"
     implementation 'com.beust:jcommander:1.82'

jgiven-tests/src/main/java/com/tngtech/jgiven/tags/FeatureJUnit5.java

@@ -0,0 +1,13 @@
+package com.tngtech.jgiven.tags;
+
+import com.tngtech.jgiven.annotation.IsTag;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@FeatureTestFramework
+@IsTag( name = "JUnit5",
+    description = "Tests can be be executed with JUnit5" )
+@Retention( RetentionPolicy.RUNTIME )
+public @interface FeatureJUnit5 {
+
+}

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/GivenTestStage.java

@@ -7,13 +7,15 @@ public GivenTestStage an_exception_is_thrown() {
         throw new RuntimeException("Some Exception");
     }
 
-    public void nothing() {
+    public GivenTestStage nothing() {
+        return this;
     }
 
-    public void a_failed_step(boolean fail) {
+    public GivenTestStage a_failed_step(boolean fail) {
         if (fail) {
             throw new IllegalArgumentException();
         }
+        return this;
     }
 
 

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/GuaranteedFieldRealTest.java

@@ -6,7 +6,8 @@
 import com.tngtech.jgiven.junit.ScenarioTest;
 import org.junit.Test;
 
-public class GuaranteedFieldRealTest extends ScenarioTest<GuaranteedFieldRealTest.RealGiven, GuaranteedFieldRealTest.RealWhen, GuaranteedFieldRealTest.RealThen> {
+public class GuaranteedFieldRealTest extends
+    ScenarioTest<GuaranteedFieldRealTest.RealGiven, GuaranteedFieldRealTest.RealWhen, GuaranteedFieldRealTest.RealThen> {
 
     @Test
     public void a_sample_test() {

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/JGivenReportExtractingExtension.java

@@ -0,0 +1,35 @@
+package com.tngtech.jgiven.tests;
+
+import com.tngtech.jgiven.exception.JGivenWrongUsageException;
+import com.tngtech.jgiven.impl.ScenarioBase;
+import com.tngtech.jgiven.impl.ScenarioHolder;
+import com.tngtech.jgiven.junit5.JGivenExtension;
+import com.tngtech.jgiven.report.model.ReportModel;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+/**
+ * Extracts the report Model from within the Test context before it gets deleted.
+ */
+public class JGivenReportExtractingExtension extends JGivenExtension {
+
+    private static final Map<Class<?>, ReportModel> modelHolder = new ConcurrentHashMap<>();
+
+    public static Optional<ReportModel> getReportModelFor(Class<?> testClass) {
+        return Optional.ofNullable(modelHolder.get(testClass));
+    }
+
+
+    @Override
+    public void afterTestExecution(ExtensionContext context) throws Exception {
+        Class<?> testClass = context.getTestClass()
+            .orElseThrow(() -> new JGivenWrongUsageException("tests without test class are not supported yet"));
+        Optional.ofNullable(ScenarioHolder.get())
+            .map(ScenarioHolder::getScenarioOfCurrentThread)
+            .map(ScenarioBase::getModel)
+            .ifPresent(model -> modelHolder.put(testClass, model));
+        super.afterTestExecution(context);
+    }
+}

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/JUnit5AfterMethodTests.java

@@ -0,0 +1,48 @@
+package com.tngtech.jgiven.tests;
+
+import com.tngtech.jgiven.base.ScenarioTestBase;
+import com.tngtech.jgiven.impl.Scenario;
+import com.tngtech.jgiven.report.model.ScenarioCaseModel;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+@ExtendWith(JGivenReportExtractingExtension.class)
+public class JUnit5AfterMethodTests extends ScenarioTestBase<GivenTestStage, WhenTestStage, ThenTestStage> {
+
+    private final Scenario<GivenTestStage, WhenTestStage, ThenTestStage> scenario = createScenario();
+
+    @Override
+    public Scenario<GivenTestStage, WhenTestStage, ThenTestStage> getScenario() {
+        return scenario;
+    }
+
+    @Test
+    public void a_failing_JUnit_5_test() {
+        given().nothing();
+        when().a_step_fails();
+        then().something_happened();
+    }
+
+    @Test
+    public void a_succeeding_JUnit5_test() {
+        given().nothing();
+        when().something_happens();
+        then().something_happened();
+    }
+
+    @Test
+    @Disabled
+    public void a_skipped_JUnit5_test() {
+        given().nothing();
+        when().something_happens();
+        then().something_happened();
+    }
+
+
+    @AfterEach
+    public void modifyScenario() {
+        getScenario().getModel().getLastScenarioModel().addCase(new ScenarioCaseModel());
+    }
+}

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/ScenarioTestForTesting.java

@@ -3,7 +3,9 @@
 import com.tngtech.jgiven.impl.Scenario;
 import com.tngtech.jgiven.junit.ScenarioTest;
 import com.tngtech.jgiven.impl.ScenarioHolder;
+import org.junit.jupiter.api.extension.ExtendWith;
 
+@ExtendWith(JGivenReportExtractingExtension.class)
 public class ScenarioTestForTesting<GIVEN, WHEN, THEN> extends ScenarioTest<GIVEN,WHEN,THEN> {
     @Override
     public Scenario<GIVEN, WHEN, THEN> getScenario() {

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/TestClassWithDescription.java

@@ -1,17 +1,19 @@
 package com.tngtech.jgiven.tests;
 
-import org.junit.Test;
-import org.testng.annotations.Listeners;
-
 import com.tngtech.jgiven.annotation.Description;
 import com.tngtech.jgiven.junit.ScenarioTest;
 import com.tngtech.jgiven.testng.ScenarioTestListener;
+import org.junit.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.testng.annotations.Listeners;
 
 @Listeners( ScenarioTestListener.class )
+@ExtendWith(JGivenReportExtractingExtension.class)
 @Description( "Test Description" )
 public class TestClassWithDescription extends ScenarioTest<GivenTestStage, WhenTestStage, ThenTestStage> {
 
     @Test
+    @org.junit.jupiter.api.Test
     @org.testng.annotations.Test
     public void some_test() {
         given().nothing();

jgiven-tests/src/main/java/com/tngtech/jgiven/tests/TestClassWithOnlyIgnoredTests.java

@@ -1,17 +1,20 @@
 package com.tngtech.jgiven.tests;
 
+import com.tngtech.jgiven.testng.ScenarioTestListener;
 import org.junit.Ignore;
 import org.junit.Test;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.testng.annotations.Listeners;
 
-import com.tngtech.jgiven.junit.ScenarioTest;
-import com.tngtech.jgiven.testng.ScenarioTestListener;
-
 @Listeners( ScenarioTestListener.class )
+@ExtendWith(JGivenReportExtractingExtension.class)
 public class TestClassWithOnlyIgnoredTests extends ScenarioTestForTesting<GivenTestStage, WhenTestStage, ThenTestStage> {
 
     @Ignore
     @Test
+    @org.junit.jupiter.api.Test
+    @Disabled
     @org.testng.annotations.Test( enabled = false )
     public void test() {