Only require test classes to have a name ending in Tests

Previously, the check would apply to interfaces and annotations as
well. This commit tightens up the check so that it only applies to
classes.

Closes gh-364

spring-javaformat/spring-javaformat-checkstyle/src/main/java/io/spring/javaformat/checkstyle/check/SpringTestFileNameCheck.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2023 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,23 +18,39 @@
 
 import java.io.File;
 
+import com.puppycrawl.tools.checkstyle.JavaParser;
+import com.puppycrawl.tools.checkstyle.JavaParser.Options;
 import com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck;
 import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
+import com.puppycrawl.tools.checkstyle.api.DetailAST;
 import com.puppycrawl.tools.checkstyle.api.FileText;
+import com.puppycrawl.tools.checkstyle.api.TokenTypes;
 
 /**
- * Checks that test filenames end {@literal Tests.java} and not {@literal Test.java}.
+ * Checks that test class filenames end {@literal Tests.java} and not {@literal Test.java}.
  *
  * @author Phillip Webb
+ * @author Andy Wilkinson
  */
 public class SpringTestFileNameCheck extends AbstractFileSetCheck {
 
 	@Override
 	protected void processFiltered(File file, FileText fileText) throws CheckstyleException {
 		String path = file.getPath().replace('\\', '/');
 		if (path.contains("src/test/java") && file.getName().endsWith("Test.java")) {
-			log(1, "testfilename.wrongName");
+			visitCompilationUnit(JavaParser.parseFileText(fileText, Options.WITHOUT_COMMENTS));
 		}
 	}
-
+
+	private void visitCompilationUnit(DetailAST ast) {
+		DetailAST child = ast.getFirstChild();
+		while (child != null) {
+			if (child.getType() == TokenTypes.CLASS_DEF) {
+				log(1, "testfilename.wrongName");
+				return;
+			}
+			child = child.getNextSibling();
+		}
+	}
+
 }

spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/SpringChecksTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2023 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -123,8 +123,10 @@ public static Collection<Parameter> paramaters() throws IOException {
 			.map(Parameter::new)
 			.collect(Collectors.toCollection(ArrayList::new));
 		parameters.add(new Parameter(new File(SOURCES_DIR, "nopackageinfo/NoPackageInfo.java")));
-		parameters.add(new Parameter(new File(SOURCES_DIR, "src/test/java/NamedTest.java")));
-		parameters.add(new Parameter(new File(SOURCES_DIR, "src/test/java/NamedTests.java")));
+		Arrays.stream(new File(SOURCES_DIR, "src/test/java").listFiles(SpringChecksTests::sourceFile))
+			.sorted()
+			.map(Parameter::new)
+			.forEach(parameters::add);
 		return parameters;
 	}
 

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/src/test/java/AnnotationEndingInTest.txt

@@ -0,0 +1 @@
++0 errors

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/src/test/java/InterfaceEndingInTest.txt

@@ -0,0 +1 @@
++0 errors

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/src/test/java/AnnotationEndingInTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * 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
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+/**
+ * This is an annotation with a legal name. Only test classes must
+ * have a name that ends with {@code Tests}.
+ *
+ * @author Andy Wilkinson
+ */
+public @interface AnnotationEndingInTest {
+
+}

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/src/test/java/InterfaceEndingInTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * 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
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+/**
+ * This is an interface with a legal name. Only test classes must
+ * have a name that ends with {@code Tests}.
+ *
+ * @author Andy Wilkinson
+ */
+public interface InterfaceEndingInTest {
+
+}