Implement JUnit5 support and parameterize tests

WORKSPACE

@@ -379,8 +379,8 @@ http_archive(
 # LICENSE: Common Public License 1.0
 jvm_maven_import_external(
     name = "junit",
-    artifact = "junit:junit:4.12",
-    artifact_sha256 = "59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a",
+    artifact = "junit:junit:4.13",
+    artifact_sha256 = "4b8532f63bdc0e0661507f947eb324a954d1dbac631ad19c8aa9a00feed1d863",
     licenses = ["notice"],  # Common Public License 1.0
     server_urls = ["https://repo1.maven.org/maven2"],
 )

examples/java/greetings_project/WORKSPACE

@@ -1,4 +1,5 @@
 load("@bazel_tools//tools/build_defs/repo:jvm.bzl", "jvm_maven_import_external")
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 jvm_maven_import_external(
     name = "junit",
@@ -7,3 +8,29 @@ jvm_maven_import_external(
     licenses = ["notice"],  # Common Public License 1.0
     server_urls = ["https://repo1.maven.org/maven2"],
 )
+
+# JUnit 5
+
+load("//:junit5_deps.bzl", "instantiate_junit5_deps")
+
+instantiate_junit5_deps()
+
+# `contrib_rules_jvm` gives us access to `java_test_suite` and the JUnit5 runner.
+CONTRIB_RULES_JVM_VERSION = "0.9.0"
+
+CONTRIB_RULES_JVM_SHA = "548f0583192ff79c317789b03b882a7be9b1325eb5d3da5d7fdcc4b7ca69d543"
+
+http_archive(
+    name = "contrib_rules_jvm",
+    sha256 = CONTRIB_RULES_JVM_SHA,
+    strip_prefix = "rules_jvm-%s" % CONTRIB_RULES_JVM_VERSION,
+    url = "https://github.com/bazel-contrib/rules_jvm/archive/refs/tags/v%s.tar.gz" % CONTRIB_RULES_JVM_VERSION,
+)
+
+load("@contrib_rules_jvm//:repositories.bzl", "contrib_rules_jvm_deps")
+
+contrib_rules_jvm_deps()
+
+load("@contrib_rules_jvm//:setup.bzl", "contrib_rules_jvm_setup")
+
+contrib_rules_jvm_setup()

examples/java/greetings_project/greeting_lib/BUILD

@@ -1,15 +1,56 @@
+load("@contrib_rules_jvm//java:defs.bzl", "java_junit5_test", "java_test_suite")
+load("//:junit5_deps.bzl", "JUNIT5_DEPS")
+
 java_library(
     name = "greeting_lib",
     srcs = ["src/com/example/Greeting.java"],
     visibility = ["//visibility:public"],
 )
 
+ava_test(
+    name = "greeting_test_junit4",
+    srcs = [
+        "tests/com/example/junit4/GreetingTest.java",
+    ],
+    test_class = "com.example.junit4.GreetingTest",
+    deps = [
+        ":greeting_lib",
+        "@junit//jar",
+    ],
+)
+
 java_test(
-    name = "greeting_test",
-    srcs = ["tests/com/example/GreetingTest.java"],
-    test_class = "com.example.GreetingTest",
+    name = "parameterized_greeting_test_junit4",
+    srcs = [
+        "tests/com/example/junit4/ParameterizedGreetingTest.java",
+    ],
+    test_class = "com.example.junit4.ParameterizedGreetingTest",
     deps = [
         ":greeting_lib",
         "@junit//jar",
     ],
 )
+
+java_junit5_test(
+    name = "greeting_test_junit5",
+    size = "small",
+    srcs = [
+        "tests/com/example/junit5/GreetingTest.java",
+    ],
+    test_class = "com.example.junit5.GreetingTest",
+    deps = [
+        ":greeting_lib",
+    ] + JUNIT5_DEPS,
+)
+
+java_junit5_test(
+    name = "parameterized_greeting_test_junit5",
+    size = "small",
+    srcs = [
+        "tests/com/example/junit5/ParameterizedGreetingTest.java",
+    ],
+    test_class = "com.example.junit5.ParameterizedGreetingTest",
+    deps = [
+        ":greeting_lib",
+    ] + JUNIT5_DEPS,
+)

examples/java/greetings_project/greeting_lib/tests/com/example/GreetingTest.java → examples/java/greetings_project/greeting_lib/tests/com/example/junit4/GreetingTest.java

@@ -1,6 +1,7 @@
-package com.example;
+package com.example.junit4;
 
 import org.junit.Test;
+import com.example.Greeting;
 
 import java.util.Arrays;
 import java.util.Collections;

examples/java/greetings_project/greeting_lib/tests/com/example/junit4/ParameterizedGreetingTest.java

@@ -0,0 +1,30 @@
+package com.example.junit4;
+
+import com.example.Greeting;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Parameterized.class)
+public class ParameterizedGreetingTest {
+    @Parameterized.Parameter
+    public String name;
+
+    @Parameterized.Parameters(name = "Test name {0}")
+    public static String[] names() {
+        return new String[]{"Henry", "Roberta"};
+    }
+
+    @Test
+    public void testGreetOneName() {
+        List<String> got = Greeting.getGreetings("greetings", Collections.singletonList(name));
+        assertEquals(1, got.size());
+        String expected = "greetings " + name + "!";
+        assertEquals(expected, got.get(0));
+    }
+}

examples/java/greetings_project/greeting_lib/tests/com/example/junit5/GreetingTest.java

@@ -0,0 +1,34 @@
+package com.example.junit5;
+
+import com.example.Greeting;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GreetingTest {
+  @Test
+  public void testGreetNoNames() {
+    List<String> got = Greeting.getGreetings("greetings", Collections.emptyList());
+    assertEquals(0, got.size());
+  }
+
+  @Test
+  public void testGreetOneName() {
+    List<String> got = Greeting.getGreetings("greetings", Collections.singletonList("name"));
+    assertEquals(1, got.size());
+    assertEquals("greetings name!", got.get(0));
+  }
+
+  @Test
+  public void testGreetMultipleNames() {
+    List<String> got = Greeting.getGreetings("greetings", Arrays.asList("name1", "name2", "name3"));
+    assertEquals(3, got.size());
+    assertEquals("greetings name1!", got.get(0));
+    assertEquals("greetings name2!", got.get(1));
+    assertEquals("greetings name3!", got.get(2));
+  }
+}

examples/java/greetings_project/greeting_lib/tests/com/example/junit5/ParameterizedGreetingTest.java

@@ -0,0 +1,23 @@
+package com.example.junit5;
+
+import com.example.Greeting;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ParameterizedGreetingTest {
+  @ParameterizedTest
+  @ValueSource(strings = { "Henry", "Roberta" })
+  public void testGreetOneName(String name) {
+    List<String> got = Greeting.getGreetings("greetings", Collections.singletonList(name));
+    assertEquals(1, got.size());
+    String expected = "greetings " + name + "!";
+    assertEquals(expected, got.get(0));
+  }
+}

examples/java/greetings_project/hi/hi.bazelproject

@@ -18,4 +18,4 @@ additional_languages:
   # dart
   # kotlin
   # python
-  # scala
+  # scala

examples/java/greetings_project/junit5_deps.bzl

@@ -0,0 +1,60 @@
+load("@bazel_tools//tools/build_defs/repo:jvm.bzl", "jvm_maven_import_external")
+
+JUNIT_JUPITER_VERSION = "5.9.2"
+
+JUNIT_PLATFORM_VERSION = "1.9.2"
+
+_JUNIT5_DEPS_TO_FETCH = [
+    {
+        "name": "junit_platform_launcher",
+        "coords": "org.junit.platform:junit-platform-launcher:%s" % JUNIT_PLATFORM_VERSION,
+        "artifact_sha256": "eef139eb09c98e9cdd358b6ce4c6cdd59b30c6a88096e369c33ba96e67edf0e4",
+    },
+    {
+        "name": "junit_platform_reporting",
+        "coords": "org.junit.platform:junit-platform-reporting:%s" % JUNIT_PLATFORM_VERSION,
+        "artifact_sha256": "d6788db1c941c1247e07d8104f57c3f06175cadfd43060a792493fe9195671db",
+    },
+    {
+        "name": "junit_platform_commons",
+        "coords": "org.junit.platform:junit-platform-commons:%s" % JUNIT_PLATFORM_VERSION,
+        "artifact_sha256": "624a3d745ef1d28e955a6a67af8edba0fdfc5c9bad680a73f67a70bb950a683d",
+    },
+    {
+        "name": "junit_platform_engine",
+        "coords": "org.junit.platform:junit-platform-engine:%s" % JUNIT_PLATFORM_VERSION,
+        "artifact_sha256": "25f23dc535a091e9dc80c008faf29dcb92be902e6911f77a736fbaf019908367",
+    },
+    {
+        "name": "junit_jupiter_api",
+        "coords": "org.junit.jupiter:junit-jupiter-api:%s" % JUNIT_JUPITER_VERSION,
+        "artifact_sha256": "f767a170f97127b0ad3582bf3358eabbbbe981d9f96411853e629d9276926fd5",
+    },
+    {
+        "name": "junit_jupiter_params",
+        "coords": "org.junit.jupiter:junit-jupiter-params:%s" % JUNIT_JUPITER_VERSION,
+        "artifact_sha256": "bde91900a5ce5d6663bb44bc708494b35daefcd73e1bb7afa61a4affe38ea97d",
+    },
+    {
+        "name": "junit_jupiter_engine",
+        "coords": "org.junit.jupiter:junit-jupiter-engine:%s" % JUNIT_JUPITER_VERSION,
+        "artifact_sha256": "74cfc49388f760413ff348ca2c9ab39527484b57deecd157f2275a5f8a5fe971",
+    },
+    {
+        "name": "opentest4j",
+        "coords": "org.opentest4j:opentest4j:1.2.0",
+        "artifact_sha256": "58812de60898d976fb81ef3b62da05c6604c18fd4a249f5044282479fc286af2",
+    },
+]
+
+JUNIT5_DEPS = ["@{name}//jar".format(name = dep["name"]) for dep in _JUNIT5_DEPS_TO_FETCH]
+
+def instantiate_junit5_deps():
+    for dep in _JUNIT5_DEPS_TO_FETCH:
+        jvm_maven_import_external(
+            name = dep["name"],
+            artifact = dep["coords"],
+            artifact_sha256 = dep["artifact_sha256"],
+            licenses = ["notice"],  # Common Public License 1.0
+            server_urls = ["https://repo1.maven.org/maven2"],
+        )