Add Kotlin support for Junit 5 recipes 1: CleanupJUnitImports (#528)

* Adding Kotlin support to the recipes, fixing the recipes to work use preVisit instead of visitCompilationUnit.

* Do a single recipe run per unit test

* Stop after pre visit, since we're only updating imports

---------

Co-authored-by: Amitoj Duggal <[email protected]>
Co-authored-by: Tim te Beek <[email protected]>

Author: 3 people

build.gradle.kts

@@ -43,6 +43,7 @@ dependencies {
 
     testImplementation("org.openrewrite:rewrite-java-17")
     testImplementation("org.openrewrite:rewrite-groovy")
+    testImplementation("org.openrewrite:rewrite-kotlin:$rewriteVersion")
     testImplementation("org.openrewrite.gradle.tooling:model:$rewriteVersion")
 
     testRuntimeOnly("org.gradle:gradle-tooling-api:latest.release")

src/main/java/org/openrewrite/java/testing/junit5/CleanupJUnitImports.java

@@ -22,6 +22,7 @@
 import org.openrewrite.java.JavaIsoVisitor;
 import org.openrewrite.java.search.UsesType;
 import org.openrewrite.java.tree.J;
+import org.openrewrite.java.tree.JavaSourceFile;
 
 public class CleanupJUnitImports extends Recipe {
     @Override
@@ -44,14 +45,18 @@ public TreeVisitor<?, ExecutionContext> getVisitor() {
 
     public static class CleanupJUnitImportsVisitor extends JavaIsoVisitor<ExecutionContext> {
         @Override
-        public J.CompilationUnit visitCompilationUnit(J.CompilationUnit cu, ExecutionContext ctx) {
-            for (J.Import im : cu.getImports()) {
-                String packageName = im.getPackageName();
-                if (packageName.startsWith("junit") || (packageName.startsWith("org.junit") && !packageName.contains("jupiter"))) {
-                    maybeRemoveImport(im.getTypeName());
+        public J preVisit(J tree, ExecutionContext ctx) {
+            stopAfterPreVisit();
+            if (tree instanceof JavaSourceFile) {
+                JavaSourceFile c = (JavaSourceFile) tree;
+                for (J.Import imp : c.getImports()) {
+                    String packageName = imp.getPackageName();
+                    if (packageName.startsWith("junit") || (packageName.startsWith("org.junit") && !packageName.contains("jupiter"))) {
+                        maybeRemoveImport(imp.getTypeName());
+                    }
                 }
             }
-            return cu;
+            return tree;
         }
     }
 }

src/test/java/org/openrewrite/java/testing/junit5/CleanupJUnitImportsTest.java

@@ -19,10 +19,12 @@
 import org.openrewrite.DocumentExample;
 import org.openrewrite.InMemoryExecutionContext;
 import org.openrewrite.java.JavaParser;
+import org.openrewrite.kotlin.KotlinParser;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
 
 import static org.openrewrite.java.Assertions.java;
+import static org.openrewrite.kotlin.Assertions.kotlin;
 
 class CleanupJUnitImportsTest implements RewriteTest {
 
@@ -31,14 +33,16 @@ public void defaults(RecipeSpec spec) {
         spec
           .parser(JavaParser.fromJavaVersion()
             .classpathFromResources(new InMemoryExecutionContext(), "junit-4.13"))
+          .parser(KotlinParser.builder()
+            .classpathFromResources(new InMemoryExecutionContext(), "junit-4.13"))
           .recipe(new CleanupJUnitImports());
     }
 
     @DocumentExample
     @Test
     void removesUnusedImport() {
-        //language=java
         rewriteRun(
+          //language=java
           java(
             """
               import org.junit.Test;
@@ -48,14 +52,25 @@ public class MyTest {}
             """
               public class MyTest {}
               """
+          ),
+          //language=kotlin
+          kotlin(
+            """
+              import org.junit.Test
+
+              class MyTest {}
+              """,
+            """
+              class MyTest {}
+              """
           )
         );
     }
 
     @Test
     void leavesOtherImportsAlone() {
-        //language=java
         rewriteRun(
+          //language=java
           java(
             """
               import java.util.Arrays;
@@ -65,14 +80,25 @@ void leavesOtherImportsAlone() {
               public class MyTest {
               }
               """
+          ),
+          //language=kotlin
+          kotlin(
+            """
+              import java.util.Arrays
+              import java.util.Collections
+              import java.util.HashSet
+
+              class MyTest {
+              }
+              """
           )
         );
     }
 
     @Test
     void leavesUsedJUnitImportAlone() {
-        //language=java
         rewriteRun(
+          //language=java
           java(
             """
               import org.junit.Test;
@@ -82,7 +108,19 @@ public class MyTest {
                   public void foo() {}
               }
               """
+          ),
+          //language=kotlin
+          kotlin(
+            """
+              import org.junit.Test
+
+              class MyTest {
+                  @Test
+                  fun foo() {}
+              }
+              """
           )
         );
+
     }
 }