add test demonstrating a rule shared between projects

run the following command
> ./gradlew :archunit-example:example-junit4:test --tests "*.ServiceRulesTest" -P example
Inspect the test result file at
> archunit-example/example-junit4/build/reports/tests/test/index.html
You will find a duplicated report for one of the projects, and the failure of the other project is lost.

Issue: TNG#452

Signed-off-by: Christian Semrau <[email protected]>

archunit-example/example-junit4/src/test/java/com/tngtech/archunit/exampletest/junit4/platform/ServiceRules.java

@@ -0,0 +1,19 @@
+package com.tngtech.archunit.exampletest.junit4.platform;
+
+import com.tngtech.archunit.example.layers.MyService;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.lang.ArchRule;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes;
+
+/**
+ * Shared rule, to be referenced in tests of "projectA" and "projectB".
+ */
+public class ServiceRules {
+    @ArchTest
+    public static ArchRule services_should_be_prefixed =
+            classes()
+                    .that().resideInAPackage("..service..")
+                    .and().areAnnotatedWith(MyService.class)
+                    .should().haveSimpleNameStartingWith("Service");
+}

archunit-example/example-junit4/src/test/java/com/tngtech/archunit/exampletest/junit4/projectA/ServiceRulesTest.java

@@ -0,0 +1,21 @@
+package com.tngtech.archunit.exampletest.junit4.projectA;
+
+import com.tngtech.archunit.exampletest.junit4.Example;
+import com.tngtech.archunit.exampletest.junit4.platform.ServiceRules;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.junit.ArchRules;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.junit.ArchUnitRunner;
+import org.junit.experimental.categories.Category;
+import org.junit.runner.RunWith;
+
+/**
+ * Runs the shared rules for "projectA" only.
+ */
+@Category(Example.class)
+@RunWith(ArchUnitRunner.class)
+@AnalyzeClasses(packages = "com.tngtech.archunit.example.projectA")
+public class ServiceRulesTest {
+    @ArchTest
+    private final ArchRules service_rules = ArchRules.in(ServiceRules.class);
+}

archunit-example/example-junit4/src/test/java/com/tngtech/archunit/exampletest/junit4/projectB/ServiceRulesTest.java

@@ -0,0 +1,21 @@
+package com.tngtech.archunit.exampletest.junit4.projectB;
+
+import com.tngtech.archunit.exampletest.junit4.Example;
+import com.tngtech.archunit.exampletest.junit4.platform.ServiceRules;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.junit.ArchRules;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.junit.ArchUnitRunner;
+import org.junit.experimental.categories.Category;
+import org.junit.runner.RunWith;
+
+/**
+ * Runs the shared rules for "projectB" only.
+ */
+@Category(Example.class)
+@RunWith(ArchUnitRunner.class)
+@AnalyzeClasses(packages = "com.tngtech.archunit.example.projectB")
+public class ServiceRulesTest {
+    @ArchTest
+    private final ArchRules service_rules = ArchRules.in(ServiceRules.class);
+}

archunit-example/example-plain/src/main/java/com/tngtech/archunit/example/projectA/service/MyServiceA.java

@@ -0,0 +1,10 @@
+package com.tngtech.archunit.example.projectA.service;
+
+import com.tngtech.archunit.example.layers.MyService;
+
+/**
+ * For Demo purposes only.
+ */
+@MyService
+public class MyServiceA {
+}

archunit-example/example-plain/src/main/java/com/tngtech/archunit/example/projectB/service/MyServiceB.java

@@ -0,0 +1,10 @@
+package com.tngtech.archunit.example.projectB.service;
+
+import com.tngtech.archunit.example.layers.MyService;
+
+/**
+ * For Demo purposes only.
+ */
+@MyService
+public class MyServiceB {
+}