Also test with Groovy 2.5 on classpath for Gradle 4, 5 & 6

rewrite-groovy2-test/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    id("org.openrewrite.build.language-library")
+}
+
+dependencies {
+    testImplementation(project(":rewrite-groovy"))
+    testImplementation(project(":rewrite-test"))
+    testImplementation("org.junit.jupiter:junit-jupiter:latest.release")
+    testImplementation("org.codehaus.groovy:groovy:[2.5,2.6)")
+    testRuntimeOnly("org.codehaus.groovy:groovy-all:[2.5,2.6)")
+    testRuntimeOnly(project(":rewrite-java-8"))
+}
+
+tasks.named<JavaCompile>("compileTestJava") {
+    sourceCompatibility = JavaVersion.VERSION_1_8.toString()
+    targetCompatibility = JavaVersion.VERSION_1_8.toString()
+
+    options.release.set(null as Int?) // remove `--release 8` set in `org.openrewrite.java-base`
+}

rewrite-groovy2-test/src/test/java/org/openrewrite/groovy/.editorconfig

@@ -0,0 +1,5 @@
+root = true
+
+[*.java]
+indent_size = 4
+ij_continuation_indent_size = 2

rewrite-groovy2-test/src/test/java/org/openrewrite/groovy/Groovy2Test.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2024 the original author or authors.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.openrewrite.groovy;
+
+import org.junit.jupiter.api.Test;
+import org.openrewrite.test.RewriteTest;
+
+import static org.openrewrite.groovy.Assertions.groovy;
+
+class Groovy2Test implements RewriteTest {
+
+    @Test
+    void useInt() {
+        rewriteRun(groovy("def variable = \"12345\""));
+    }
+
+    @Test
+    void useJavaUtilDate() {
+        rewriteRun(groovy("def variable = new java.util.Date()"));
+    }
+
+    @Test
+    void useStringMultiplicationInParentheses() {
+        rewriteRun(groovy("def variable = (\"#\" * 6)"));
+    }
+}

rewrite-java-test/build.gradle.kts

@@ -11,9 +11,6 @@ dependencies {
     testImplementation("io.github.classgraph:classgraph:latest.release")
     testImplementation("org.junit-pioneer:junit-pioneer:2.0.0")
     testRuntimeOnly(project(":rewrite-java-17"))
-    testRuntimeOnly("junit:junit:4.13.2") {
-        because("Used for RemoveUnneededAssertionTest")
-    }
     testRuntimeOnly("org.apache.hbase:hbase-shaded-client:2.4.11")
     testRuntimeOnly("com.google.guava:guava:latest.release")
     testRuntimeOnly("org.mapstruct:mapstruct:latest.release")

settings.gradle.kts

@@ -10,24 +10,27 @@ pluginManagement {
 // ---------------------------------------------------------------
 
 val allProjects = listOf(
-        "rewrite-benchmarks",
-        "rewrite-bom",
-        "rewrite-core",
-        "rewrite-gradle",
-        "rewrite-groovy",
-        "rewrite-hcl",
-        "rewrite-java",
-        "rewrite-java-tck",
-        "rewrite-java-test",
-        "rewrite-java-17", // remove this when rewrite recipe gradle plugin moves to 21
-        "rewrite-java-21",
-        "rewrite-json",
-        "rewrite-maven",
-        "rewrite-properties",
-        "rewrite-protobuf",
-        "rewrite-test",
-        "rewrite-xml",
-        "rewrite-yaml",
+    "rewrite-benchmarks",
+    "rewrite-bom",
+    "rewrite-core",
+    "rewrite-gradle",
+    "rewrite-groovy",
+    "rewrite-groovy2-test",
+    "rewrite-hcl",
+    "rewrite-java",
+    "rewrite-java-tck",
+    "rewrite-java-test",
+    "rewrite-java-8",
+    "rewrite-java-11",
+    "rewrite-java-17", // remove this when rewrite recipe gradle plugin moves to 21
+    "rewrite-java-21",
+    "rewrite-json",
+    "rewrite-maven",
+    "rewrite-properties",
+    "rewrite-protobuf",
+    "rewrite-test",
+    "rewrite-xml",
+    "rewrite-yaml",
 )
 
 val includedProjects = file("IDE.properties").let {
@@ -42,7 +45,7 @@ val includedProjects = file("IDE.properties").let {
     }
 }.toSet()
 
-if(!file("IDE.properties").exists() || includedProjects.contains("tools")) {
+if (!file("IDE.properties").exists() || includedProjects.contains("tools")) {
     includeBuild("tools")
 }
 
@@ -52,23 +55,23 @@ gradle.allprojects {
     configurations.all {
         resolutionStrategy.dependencySubstitution {
             allProjects
-                    .minus(includedProjects)
-                    .minus(arrayOf("rewrite-bom"))
-                    .forEach {
-                        substitute(project(":$it"))
-                                .using(module("org.openrewrite:$it:latest.integration"))
-                    }
+                .minus(includedProjects)
+                .minus(arrayOf("rewrite-bom"))
+                .forEach {
+                    substitute(project(":$it"))
+                        .using(module("org.openrewrite:$it:latest.integration"))
+                }
         }
     }
 }
 
 if (System.getProperty("idea.active") == null &&
-        System.getProperty("idea.sync.active") == null) {
+    System.getProperty("idea.sync.active") == null) {
     include(
-            "rewrite-java-8",
-            "rewrite-java-11",
-            "rewrite-java-17",
-            "rewrite-java-21"
+        "rewrite-java-8",
+        "rewrite-java-11",
+        "rewrite-java-17",
+        "rewrite-java-21"
     )
 }