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FileBasedTests.java
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FileBasedTests.java
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/*
* (c) Copyright 2019 Palantir Technologies Inc. All rights reserved.
*
* 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
*
* 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 com.palantir.javaformat.java;
import static com.google.common.io.Files.getFileExtension;
import static com.google.common.io.Files.getNameWithoutExtension;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.assertj.core.api.Assertions.assertThat;
import com.google.common.collect.ImmutableSet;
import com.google.common.io.CharStreams;
import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ResourceInfo;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.junit.jupiter.api.Assumptions;
import org.junit.jupiter.api.parallel.Execution;
import org.junit.jupiter.api.parallel.ExecutionMode;
@Execution(ExecutionMode.CONCURRENT)
public final class FileBasedTests {
// Test files that are only used when run with a minimum Java version
private static final ImmutableSet<String> JAVA_14_TESTS =
ImmutableSet.of("ExpressionSwitch", "RSL", "Records", "Var");
private static final ImmutableSet<String> JAVA_16_TESTS = ImmutableSet.of("I588");
private final Class<?> testClass;
/** The path prefix for all tests if loaded as resources. */
private final Path resourcePrefix;
/** Where to output test outputs when recreating. */
private final Path fullTestPath;
public FileBasedTests(Class<?> testClass) {
this(testClass, testClass.getSimpleName());
}
public FileBasedTests(Class<?> testClass, String testDirName) {
this.resourcePrefix =
Paths.get(testClass.getPackage().getName().replace('.', '/')).resolve(testDirName);
this.testClass = testClass;
this.fullTestPath = Paths.get("src/test/resources").resolve(resourcePrefix);
}
public static void assumeJavaVersionForTest(String testName) {
if (JAVA_14_TESTS.contains(testName)) {
Assumptions.assumeTrue(Formatter.getRuntimeVersion() >= 14, "Not running on jdk 14 or later");
} else if (JAVA_16_TESTS.contains(testName)) {
Assumptions.assumeTrue(Formatter.getRuntimeVersion() >= 16, "Not running on jdk 16 or later");
}
}
public List<Object[]> paramsAsNameInputOutput() throws IOException {
ClassLoader classLoader = testClass.getClassLoader();
Map<String, String> inputs = new TreeMap<>();
Map<String, String> outputs = new TreeMap<>();
for (ResourceInfo resourceInfo : ClassPath.from(classLoader).getResources()) {
String resourceName = resourceInfo.getResourceName();
Path resourceNamePath = Paths.get(resourceName);
if (resourceNamePath.startsWith(resourcePrefix)) {
Path subPath = resourcePrefix.relativize(resourceNamePath);
assertThat(subPath.getNameCount())
.describedAs("bad testdata file names")
.isEqualTo(1);
String baseName = getNameWithoutExtension(subPath.getFileName().toString());
String extension = getFileExtension(subPath.getFileName().toString());
String contents;
try (InputStream stream = testClass.getClassLoader().getResourceAsStream(resourceName)) {
contents = CharStreams.toString(new InputStreamReader(stream, UTF_8));
}
switch (extension) {
case "input":
inputs.put(baseName, contents);
break;
case "output":
outputs.put(baseName, contents);
break;
default:
}
}
}
List<Object[]> testInputs = new ArrayList<>();
if (!isRecreate()) {
assertThat(outputs).describedAs("unmatched inputs and outputs").hasSameSizeAs(inputs);
}
for (Map.Entry<String, String> entry : inputs.entrySet()) {
String fileName = entry.getKey();
String input = inputs.get(fileName);
String expectedOutput;
if (isRecreate()) {
expectedOutput = null;
} else {
assertThat(outputs).describedAs("unmatched input").containsKey(fileName);
expectedOutput = outputs.get(fileName);
}
testInputs.add(new Object[] {fileName, input, expectedOutput});
}
return testInputs;
}
public static boolean isRecreate() {
return Boolean.getBoolean("recreate");
}
private Path getOutputTestPath(String testName) {
return fullTestPath.resolve(testName + ".output");
}
public void writeFormatterOutput(String testName, String output) {
try (BufferedWriter writer = Files.newBufferedWriter(getOutputTestPath(testName))) {
writer.append(output);
} catch (IOException e) {
throw new RuntimeException("Couldn't recreate test output for " + testName, e);
}
}
}