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

rewrite-groovy/build.gradle.kts

@@ -2,6 +2,19 @@ plugins {
     id("org.openrewrite.build.language-library")
 }
 
+// As per: https://docs.gradle.org/current/userguide/java_testing.html#sec:configuring_java_integration_tests
+sourceSets {
+    create("intTest") {
+        compileClasspath += sourceSets.main.get().output
+        runtimeClasspath += sourceSets.main.get().output
+    }
+}
+val intTestImplementation by configurations.getting {
+    extendsFrom(configurations.implementation.get())
+}
+val intTestRuntimeOnly by configurations.getting
+configurations["intTestRuntimeOnly"].extendsFrom(configurations.runtimeOnly.get())
+
 dependencies {
     api(project(":rewrite-java"))
 
@@ -21,4 +34,28 @@ dependencies {
     testImplementation("org.junit-pioneer:junit-pioneer:2.0.0")
     testRuntimeOnly("org.codehaus.groovy:groovy-all:latest.release")
     testRuntimeOnly(project(":rewrite-java-17"))
+
+    intTestImplementation(project(":rewrite-test"))
+    intTestImplementation("org.junit.jupiter:junit-jupiter:latest.release")
+    intTestImplementation("org.codehaus.groovy:groovy:[2.5,2.6)")
+    intTestRuntimeOnly("org.codehaus.groovy:groovy-all:[2.5,2.6)")
+    intTestRuntimeOnly(project(":rewrite-java-17"))
+    intTestRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+// As per: https://docs.gradle.org/current/userguide/java_testing.html#sec:configuring_java_integration_tests
+val integrationTest = task<Test>("integrationTest") {
+    description = "Runs integration tests."
+    group = "verification"
+
+    testClassesDirs = sourceSets["intTest"].output.classesDirs
+    classpath = sourceSets["intTest"].runtimeClasspath
+    shouldRunAfter("test")
+
+    useJUnitPlatform()
+
+    testLogging {
+        events("passed")
+    }
 }
+tasks.check { dependsOn(integrationTest) }

rewrite-groovy/src/intTest/java/org/openrewrite/groovy/.editorconfig

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

rewrite-groovy/src/intTest/java/org/openrewrite/groovy/Groovy2Test.java

@@ -0,0 +1,57 @@
+/*
+ * 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)
+              """
+          )
+        );
+    }
+}

settings.gradle.kts

@@ -10,24 +10,24 @@ 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-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",
 )
 
 val includedProjects = file("IDE.properties").let {
@@ -42,7 +42,7 @@ 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 +52,23 @@ 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-benchmarks", "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"
     )
 }