Add GroovyAssertionsTests

Issue: #1710

Author: marcphilipp

junit-jupiter-engine/junit-jupiter-engine.gradle.kts

@@ -1,3 +1,7 @@
+plugins {
+	groovy
+}
+
 apply(from = "$rootDir/gradle/testing.gradle.kts")
 
 description = "JUnit Jupiter Engine"
@@ -31,6 +35,7 @@ dependencies {
 	testImplementation(project(":junit-platform-runner"))
 	testImplementation(project(":junit-platform-testkit"))
 	testImplementation("org.jetbrains.kotlin:kotlin-stdlib")
+	testImplementation(localGroovy())
 	testImplementation("com.google.jimfs:jimfs:${Versions.jimfs}") {
 		because("used to test TempDirectory extension")
 	}

junit-jupiter-engine/src/test/groovy/org/junit/jupiter/api/GroovyAssertionsTests.groovy

@@ -0,0 +1,29 @@
+package org.junit.jupiter.api
+
+import groovy.transform.CompileStatic
+
+import static org.junit.jupiter.api.Assertions.assertEquals
+import static org.junit.jupiter.api.Assertions.assertNotEquals
+
+@CompileStatic
+class GroovyAssertionsTests {
+
+    @Test
+    void "integers can be passed to assertEquals"() {
+        assertEquals(42, 42)
+        assertEquals(42, Integer.valueOf(42))
+        assertEquals(Integer.valueOf(42), 42)
+        // TODO add overload for assertEquals(Integer, Integer)
+        //assertEquals(Integer.valueOf(42), Integer.valueOf(42))
+    }
+
+    @Test
+    void "integers can be passed to assertNotEquals"() {
+        assertNotEquals(23, 42)
+        assertNotEquals(23, Integer.valueOf(42))
+        assertNotEquals(Integer.valueOf(23), 42)
+        // TODO add overload for assertNotEquals(Integer, Integer)
+        //assertNotEquals(Integer.valueOf(23), Integer.valueOf(42))
+    }
+
+}