JetControlFlowTest rewritten to generator

compiler/tests/org/jetbrains/jet/JetTestUtils.java

@@ -38,6 +38,7 @@ import com.intellij.util.containers.ContainerUtil;
 import junit.framework.TestCase;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.analyzer.AnalyzeExhaust;
 import org.jetbrains.jet.cli.jvm.compiler.CliLightClassGenerationSupport;
@@ -713,4 +714,9 @@ public class JetTestUtils {
         test.initialize(new WritableScopeImpl(JetScope.EMPTY, test, RedeclarationHandler.DO_NOTHING, "members of test namespace"));
         return test;
     }
+
+    @NotNull
+    public static File replaceExtension(@NotNull File file, @Nullable String newExtension) {
+        return new File(file.getParentFile(), FileUtil.getNameWithoutExtension(file) + (newExtension == null ? "" : "." + newExtension));
+    }
 }