java-decompiler: base class extracted to allow decompiler customization in tests

test/org/jetbrains/java/decompiler/SingleClassesTestBase.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * 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 org.jetbrains.java.decompiler;
+
+import org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler;
+import org.jetbrains.java.decompiler.util.InterpreterUtil;
+import org.junit.After;
+import org.junit.Before;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public abstract class SingleClassesTestBase {
+  private DecompilerTestFixture fixture;
+
+  @Before
+  public void setUp() throws IOException {
+    fixture = new DecompilerTestFixture();
+    fixture.setUp(getDecompilerOptions());
+  }
+
+  @After
+  public void tearDown() {
+    fixture.tearDown();
+    fixture = null;
+  }
+
+  protected Map<String, Object> getDecompilerOptions() {
+    return Collections.emptyMap();
+  }
+
+  protected void doTest(String testFile) {
+    try {
+      File classFile = new File(fixture.getTestDataDir(), "/classes/" + testFile + ".class");
+      assertTrue(classFile.isFile());
+      String testName = classFile.getName().substring(0, classFile.getName().length() - 6);
+
+      ConsoleDecompiler decompiler = fixture.getDecompiler();
+      for (File file : collectClasses(classFile)) decompiler.addSpace(file, true);
+      decompiler.decompileContext();
+
+      File decompiledFile = new File(fixture.getTargetDir(), testName + ".java");
+      assertTrue(decompiledFile.isFile());
+      File referenceFile = new File(fixture.getTestDataDir(), "results/" + testName + ".dec");
+      assertTrue(referenceFile.isFile());
+      compareContent(decompiledFile, referenceFile);
+    }
+    catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private static List<File> collectClasses(File classFile) {
+    List<File> files = new ArrayList<File>();
+    files.add(classFile);
+
+    File parent = classFile.getParentFile();
+    if (parent != null) {
+      final String pattern = classFile.getName().replace(".class", "") + "\\$.+\\.class";
+      File[] inner = parent.listFiles(new FilenameFilter() {
+        @Override
+        public boolean accept(File dir, String name) {
+          return name.matches(pattern);
+        }
+      });
+      if (inner != null) Collections.addAll(files, inner);
+    }
+
+    return files;
+  }
+
+  private static void compareContent(File decompiledFile, File referenceFile) throws IOException {
+    String decompiledContent = new String(InterpreterUtil.getBytes(decompiledFile), "UTF-8");
+
+    String referenceContent = new String(InterpreterUtil.getBytes(referenceFile), "UTF-8");
+    if (InterpreterUtil.IS_WINDOWS && !referenceContent.contains("\r\n")) {
+      referenceContent = referenceContent.replace("\n", "\r\n");  // fix for broken Git checkout on Windows
+    }
+
+    assertEquals(referenceContent, decompiledContent);
+  }
+}