BAEL-9314 (#18726)

* BAEL-9314

* BAEL-9314 fix pom.xml

* Added @beforeeach to print the language of the context

* Changed GreeterClassTemplateTest to GreeterClassTemplateUnitTest

* Use log statements instead of print statements

Author: jsfan3

testing-modules/junit-5-advanced-3/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>junit-5-advanced-3</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>junit-5-advanced-3</name>
+    <description>Advanced JUnit 5 Topics</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>testing-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-launcher</artifactId>
+            <version>${junit-platform-launcher.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <junit-jupiter.version>5.13.4</junit-jupiter.version>
+        <junit-platform-launcher.version>1.13.4</junit-platform-launcher.version>
+        <maven-surefire-plugin.version>3.5.3</maven-surefire-plugin.version>
+    </properties>
+
+</project>
+

testing-modules/junit-5-advanced-3/src/main/java/com/baeldung/classtemplate/Greeter.java

@@ -0,0 +1,9 @@
+package com.baeldung.classtemplate;
+
+public class Greeter {
+
+    public String greet(String name, String language) {
+        return "it".equals(language) ? "Ciao " + name : "Hello " + name;
+    }
+}
+

testing-modules/junit-5-advanced-3/src/test/java/com/baeldung/classtemplate/GreeterClassTemplateInvocationContextProvider.java

@@ -0,0 +1,57 @@
+package com.baeldung.classtemplate;
+
+import java.util.List;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.ClassTemplate;
+import org.junit.jupiter.api.extension.ClassTemplateInvocationContext;
+import org.junit.jupiter.api.extension.ClassTemplateInvocationContextProvider;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolver;
+
+public class GreeterClassTemplateInvocationContextProvider
+        implements ClassTemplateInvocationContextProvider {
+
+    @Override
+    public boolean supportsClassTemplate(ExtensionContext context) {
+        return context.getTestClass()
+                      .map(c -> c.isAnnotationPresent(ClassTemplate.class))
+                      .orElse(false);
+    }
+
+    @Override
+    public Stream<ClassTemplateInvocationContext> provideClassTemplateInvocationContexts(
+            ExtensionContext context) {
+
+        return Stream.of(contextFor("en"), contextFor("it"));
+    }
+
+    private ClassTemplateInvocationContext contextFor(String language) {
+        ParameterResolver resolver = new ParameterResolver() {
+            @Override
+            public boolean supportsParameter(ParameterContext pc, ExtensionContext ec) {
+                return pc.getParameter().getType() == String.class;
+            }
+
+            @Override
+            public Object resolveParameter(ParameterContext pc, ExtensionContext ec) {
+                return language;
+            }
+        };
+
+        return new ClassTemplateInvocationContext() {
+            @Override
+            public String getDisplayName(int invocationIndex) {
+                return "Language-" + language;
+            }
+
+            @Override
+            public List<Extension> getAdditionalExtensions() {
+                return List.of(resolver);
+            }
+        };
+    }
+}
+

testing-modules/junit-5-advanced-3/src/test/java/com/baeldung/classtemplate/GreeterClassTemplateUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.classtemplate;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import static java.lang.System.Logger;
+import static java.lang.System.Logger.Level;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.ClassTemplate;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+@ClassTemplate
+@ExtendWith(GreeterClassTemplateInvocationContextProvider.class)
+class GreeterClassTemplateUnitTest {
+
+    private static final Logger LOG =
+        System.getLogger("GreeterClassTemplateUnitTest");
+
+    private final String language;
+
+    GreeterClassTemplateUnitTest(String language) {
+        this.language = language;
+    }
+
+    @BeforeEach
+    void logContext() {
+        LOG.log(Level.INFO, () -> ">> Context: Language-" + language);
+    }
+
+    @Test
+    void whenGreet_thenLocalizedMessage() {
+
+        Greeter greeter = new Greeter();
+        String actual = greeter.greet("Baeldung", language);
+
+        assertEquals(
+          "it".equals(language) ? "Ciao Baeldung" : "Hello Baeldung",
+          actual
+        );
+    }
+}
+