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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2022/07/05 12:05:08 UTC
[GitHub] [flink] Myasuka commented on a diff in pull request #20145: [FLINK-25315][tests] add new extensions and utils to help the Junit5 …
Myasuka commented on code in PR #20145:
URL: https://github.com/apache/flink/pull/20145#discussion_r913702461
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/extensions/parameterized/ParameterizedTestExtension.java:
##########
@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.extensions.parameterized;
+
+import org.junit.jupiter.api.TestTemplate;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
+import org.junit.platform.commons.support.AnnotationSupport;
+import org.junit.platform.commons.support.HierarchyTraversalMode;
+import org.junit.runners.Parameterized;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+/**
+ * This extension is used to implement parameterized tests for Junit 5 to replace {@link
+ * Parameterized}.
+ *
+ * <p>When use this extension, all tests must be annotated by {@link TestTemplate}.
+ */
+public class ParameterizedTestExtension implements TestTemplateInvocationContextProvider {
+
+ private static final ExtensionContext.Namespace NAMESPACE =
+ ExtensionContext.Namespace.create("parameterized");
+ private static final String PARAMETERS_STORE_KEY = "parameters";
+ private static final String PARAMETER_FIELD_STORE_KEY_PREFIX = "parameterField_";
+
+ @Override
+ public boolean supportsTestTemplate(ExtensionContext context) {
+ return true;
+ }
+
+ @Override
+ public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContexts(
+ ExtensionContext context) {
+
+ // Search method annotated with @Parameters
+ final List<Method> parameterProviders =
+ AnnotationSupport.findAnnotatedMethods(
+ context.getRequiredTestClass(),
+ Parameters.class,
+ HierarchyTraversalMode.TOP_DOWN);
+ if (parameterProviders.isEmpty()) {
+ throw new IllegalStateException("Cannot find any parameter provider");
+ }
+ if (parameterProviders.size() > 1) {
+ throw new IllegalStateException("Multiple parameter providers are found");
+ }
+
+ // Get potential test name
+ String testNameTemplate = parameterProviders.get(0).getAnnotation(Parameters.class).name();
Review Comment:
I can see many places have the usage of `parameterProviders.get(0)`, we can use just one variable to share it in many places.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/extensions/parameterized/ParameterizedTestExtension.java:
##########
@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.extensions.parameterized;
+
+import org.junit.jupiter.api.TestTemplate;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
+import org.junit.platform.commons.support.AnnotationSupport;
+import org.junit.platform.commons.support.HierarchyTraversalMode;
+import org.junit.runners.Parameterized;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+/**
+ * This extension is used to implement parameterized tests for Junit 5 to replace {@link
+ * Parameterized}.
+ *
+ * <p>When use this extension, all tests must be annotated by {@link TestTemplate}.
+ */
+public class ParameterizedTestExtension implements TestTemplateInvocationContextProvider {
+
+ private static final ExtensionContext.Namespace NAMESPACE =
+ ExtensionContext.Namespace.create("parameterized");
+ private static final String PARAMETERS_STORE_KEY = "parameters";
+ private static final String PARAMETER_FIELD_STORE_KEY_PREFIX = "parameterField_";
+
+ @Override
+ public boolean supportsTestTemplate(ExtensionContext context) {
+ return true;
+ }
+
+ @Override
+ public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContexts(
+ ExtensionContext context) {
+
+ // Search method annotated with @Parameters
+ final List<Method> parameterProviders =
+ AnnotationSupport.findAnnotatedMethods(
+ context.getRequiredTestClass(),
+ Parameters.class,
+ HierarchyTraversalMode.TOP_DOWN);
+ if (parameterProviders.isEmpty()) {
+ throw new IllegalStateException("Cannot find any parameter provider");
+ }
+ if (parameterProviders.size() > 1) {
+ throw new IllegalStateException("Multiple parameter providers are found");
+ }
+
+ // Get potential test name
+ String testNameTemplate = parameterProviders.get(0).getAnnotation(Parameters.class).name();
+
+ // Get parameter values
+ final Object parameterValues;
+ try {
+ parameterValues = parameterProviders.get(0).invoke(null);
+ context.getStore(NAMESPACE).put(PARAMETERS_STORE_KEY, parameterValues);
+ } catch (Exception e) {
+ throw new IllegalStateException("Failed to invoke parameter provider", e);
+ }
+ assert parameterValues != null;
+
+ // Parameter values could be Object[][]
+ if (parameterValues instanceof Object[][]) {
+ Object[][] typedParameterValues = (Object[][]) parameterValues;
+ return createContextForParameters(
+ Arrays.stream(typedParameterValues), testNameTemplate, context);
+ }
+
+ // or a Collection
+ if (parameterValues instanceof Collection) {
+ final Collection<?> typedParameterValues = (Collection<?>) parameterValues;
+ final Stream<Object[]> parameterValueStream =
+ typedParameterValues.stream()
+ .map(
+ (Function<Object, Object[]>)
+ parameterValue -> {
+ if (parameterValue instanceof Object[]) {
+ return (Object[]) parameterValue;
+ } else {
+ return new Object[] {parameterValue};
+ }
+ });
+ return createContextForParameters(parameterValueStream, testNameTemplate, context);
+ }
+
+ throw new IllegalStateException(
+ String.format(
+ "Return type of @Parameters annotated method \"%s\" should be either Object[][] or Collection",
+ parameterProviders.get(0)));
+ }
+
+ private static class FieldInjectingInvocationContext implements TestTemplateInvocationContext {
+
+ private final String testNameTemplate;
+ private final Object[] parameterValues;
+
+ public FieldInjectingInvocationContext(String testNameTemplate, Object[] parameterValues) {
+ this.testNameTemplate = testNameTemplate;
+ this.parameterValues = parameterValues;
+ }
+
+ @Override
+ public String getDisplayName(int invocationIndex) {
+ if (testNameTemplate.equals("{index}")) {
Review Comment:
I think we should avoid to use such magic string.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
+public class TempDirUtils {
Review Comment:
I found we lack a test to use this class, maybe `PackagedProgramUtilsPipelineTest.java` is a good choice.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/extensions/parameterized/Parameters.java:
##########
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.extensions.parameterized;
+
+import org.junit.runners.Parameterized;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * The annotation is used to replace {@link Parameterized.Parameters} for Junit 5 parameterized
Review Comment:
We should avoid importing junit4's class here.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/extensions/parameterized/ParameterizedTestExtension.java:
##########
@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.extensions.parameterized;
+
+import org.junit.jupiter.api.TestTemplate;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
+import org.junit.platform.commons.support.AnnotationSupport;
+import org.junit.platform.commons.support.HierarchyTraversalMode;
+import org.junit.runners.Parameterized;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+/**
+ * This extension is used to implement parameterized tests for Junit 5 to replace {@link
+ * Parameterized}.
Review Comment:
We should avoid to import junit4's class here.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
+public class TempDirUtils {
+ private static final String TMP_PREFIX = "junit";
+
+ public static File newFolder(Path path) throws IOException {
+ Path tempPath;
+ if (path != null) {
+ tempPath = Files.createTempDirectory(path, TMP_PREFIX, new FileAttribute[0]);
+ } else {
+ tempPath = Files.createTempDirectory(TMP_PREFIX, new FileAttribute[0]);
Review Comment:
I think we can use `Files.createTempDirectory(TMP_PREFIX)` to replace this.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
+public class TempDirUtils {
+ private static final String TMP_PREFIX = "junit";
+
+ public static File newFolder(Path path) throws IOException {
+ Path tempPath;
+ if (path != null) {
+ tempPath = Files.createTempDirectory(path, TMP_PREFIX, new FileAttribute[0]);
+ } else {
+ tempPath = Files.createTempDirectory(TMP_PREFIX, new FileAttribute[0]);
+ }
+ return tempPath.toFile();
+ }
+
+ public static File newFile(Path path) throws IOException {
+ return File.createTempFile(TMP_PREFIX, null, path.toFile());
+ }
+
+ public static File newFolder(Path base, String... paths) throws IOException {
+ if (paths.length == 0) {
+ throw new IllegalArgumentException("must pass at least one path");
+ }
+
+ /*
+ * Before checking if the paths are absolute paths, check if create() was ever called,
+ * and if it wasn't, throw IllegalStateException.
+ */
+ File root = base.toFile();
+ for (String path : paths) {
+ if (new File(path).isAbsolute()) {
+ throw new IOException("folder path \'" + path + "\' is not a relative path");
Review Comment:
```suggestion
throw new IOException(String.format("folder path '%s' is not a relative path", path));
```
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
Review Comment:
We should avoid referring junit4's class here.
We can change it to `The utils contains some methods same as org.junit.rules.TemporaryFolder.`.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
+public class TempDirUtils {
+ private static final String TMP_PREFIX = "junit";
+
+ public static File newFolder(Path path) throws IOException {
+ Path tempPath;
+ if (path != null) {
+ tempPath = Files.createTempDirectory(path, TMP_PREFIX, new FileAttribute[0]);
+ } else {
+ tempPath = Files.createTempDirectory(TMP_PREFIX, new FileAttribute[0]);
+ }
+ return tempPath.toFile();
+ }
+
+ public static File newFile(Path path) throws IOException {
+ return File.createTempFile(TMP_PREFIX, null, path.toFile());
+ }
+
+ public static File newFolder(Path base, String... paths) throws IOException {
+ if (paths.length == 0) {
+ throw new IllegalArgumentException("must pass at least one path");
+ }
+
+ /*
+ * Before checking if the paths are absolute paths, check if create() was ever called,
+ * and if it wasn't, throw IllegalStateException.
+ */
+ File root = base.toFile();
+ for (String path : paths) {
+ if (new File(path).isAbsolute()) {
+ throw new IOException("folder path \'" + path + "\' is not a relative path");
+ }
+ }
+
+ File relativePath = null;
+ File file = root;
+ boolean lastMkdirsCallSuccessful = true;
+ for (String path : paths) {
+ relativePath = new File(relativePath, path);
+ file = new File(root, relativePath.getPath());
+
+ lastMkdirsCallSuccessful = file.mkdirs();
+ if (!lastMkdirsCallSuccessful && !file.isDirectory()) {
+ if (file.exists()) {
+ throw new IOException(
+ "a file with the path \'" + relativePath.getPath() + "\' exists");
+ } else {
+ throw new IOException(
+ "could not create a folder with the path \'"
+ + relativePath.getPath()
+ + "\'");
+ }
+ }
+ }
+ if (!lastMkdirsCallSuccessful) {
+ throw new IOException(
+ "a folder with the path \'" + relativePath.getPath() + "\' already exists");
+ }
+ return file;
+ }
+
+ public static File newFile(Path folder, String fileName) throws IOException {
+ File file = new File(folder.toFile(), fileName);
+ if (!file.createNewFile()) {
+ throw new IOException(
+ "a file with the name \'" + fileName + "\' already exists in the test folder");
Review Comment:
Please update all similar places.
##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/testutils/junit/utils/TempDirUtils.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.testutils.junit.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileAttribute;
+
+/** The utils contains some methods same as {@link org.junit.rules.TemporaryFolder}. */
+public class TempDirUtils {
+ private static final String TMP_PREFIX = "junit";
+
+ public static File newFolder(Path path) throws IOException {
+ Path tempPath;
+ if (path != null) {
+ tempPath = Files.createTempDirectory(path, TMP_PREFIX, new FileAttribute[0]);
+ } else {
+ tempPath = Files.createTempDirectory(TMP_PREFIX, new FileAttribute[0]);
+ }
+ return tempPath.toFile();
+ }
+
+ public static File newFile(Path path) throws IOException {
+ return File.createTempFile(TMP_PREFIX, null, path.toFile());
+ }
+
+ public static File newFolder(Path base, String... paths) throws IOException {
+ if (paths.length == 0) {
+ throw new IllegalArgumentException("must pass at least one path");
+ }
+
+ /*
+ * Before checking if the paths are absolute paths, check if create() was ever called,
+ * and if it wasn't, throw IllegalStateException.
+ */
+ File root = base.toFile();
+ for (String path : paths) {
+ if (new File(path).isAbsolute()) {
+ throw new IOException("folder path \'" + path + "\' is not a relative path");
+ }
+ }
+
+ File relativePath = null;
+ File file = root;
+ boolean lastMkdirsCallSuccessful = true;
+ for (String path : paths) {
+ relativePath = new File(relativePath, path);
+ file = new File(root, relativePath.getPath());
+
+ lastMkdirsCallSuccessful = file.mkdirs();
+ if (!lastMkdirsCallSuccessful && !file.isDirectory()) {
+ if (file.exists()) {
+ throw new IOException(
+ "a file with the path \'" + relativePath.getPath() + "\' exists");
Review Comment:
```suggestion
String.format("a file with the path '%s' exists", relativePath.getPath()));
```
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