LightCodeInsightTestCase: now test name can force the language level.

java/java-tests/testSrc/com/intellij/codeInsight/daemon/quickFix/StreamApiMigrationInspectionTest.java

@@ -33,8 +33,8 @@ public class StreamApiMigrationInspectionTest extends LightQuickFixParameterized
   }
 
   @Override
-  protected LanguageLevel getLanguageLevel() {
-    return getTestName(false).contains("Java9") ? LanguageLevel.JDK_1_9 : LanguageLevel.JDK_1_8;
+  protected LanguageLevel getDefaultLanguageLevel() {
+    return LanguageLevel.JDK_1_8;
   }
 
   public void test() throws Exception { doAllTests(); }

java/java-tests/testSrc/com/intellij/codeInsight/intention/ExtractSetFromComparisonChainActionTest.java

@@ -23,11 +23,8 @@ public class ExtractSetFromComparisonChainActionTest extends LightIntentionActio
   public void test() throws Exception { doAllTests(); }
 
   @Override
-  protected LanguageLevel getLanguageLevel() {
-    String name = getTestName(false);
-    return name.contains("Java9") ? LanguageLevel.JDK_1_9 :
-           name.contains("Java4") ? LanguageLevel.JDK_1_4 :
-           LanguageLevel.JDK_1_8;
+  protected LanguageLevel getDefaultLanguageLevel() {
+    return LanguageLevel.JDK_1_8;
   }
 
   @Override

java/java-tests/testSrc/com/intellij/codeInspection/SimplifyOptionalCallChainsInspectionTest.java

@@ -17,7 +17,6 @@ package com.intellij.codeInspection;
 
 import com.intellij.codeInsight.daemon.quickFix.LightQuickFixParameterizedTestCase;
 import com.intellij.openapi.projectRoots.Sdk;
-import com.intellij.pom.java.LanguageLevel;
 import com.intellij.testFramework.IdeaTestUtil;
 import org.jetbrains.annotations.NotNull;
 
@@ -25,14 +24,9 @@ import org.jetbrains.annotations.NotNull;
  * @author Tagir Valeev
  */
 public class SimplifyOptionalCallChainsInspectionTest extends LightQuickFixParameterizedTestCase {
-  @Override
-  protected LanguageLevel getLanguageLevel() {
-    return getTestName(false).endsWith("Java9.java") ? LanguageLevel.JDK_1_9 : LanguageLevel.JDK_1_8;
-  }
-
   @Override
   protected Sdk getProjectJDK() {
-    return getTestName(false).endsWith("Java9.java") ? IdeaTestUtil.getMockJdk9() : IdeaTestUtil.getMockJdk18();
+    return IdeaTestUtil.getMockJdk9();
   }
 
   @NotNull

java/testFramework/src/com/intellij/testFramework/LightCodeInsightTestCase.java

@@ -23,10 +23,15 @@ import com.intellij.pom.java.LanguageLevel;
 import com.intellij.psi.impl.JavaPsiFacadeEx;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 /**
  * A TestCase for single PsiFile being opened in Editor conversion. See configureXXX and checkResultXXX method docs.
  */
 public abstract class LightCodeInsightTestCase extends LightPlatformCodeInsightTestCase {
+  private static final Pattern JDK_SELECT_PATTERN = Pattern.compile("Java([\\d.]+).java$");
+
   public static JavaPsiFacadeEx getJavaFacade() {
     return JavaPsiFacadeEx.getInstanceEx(ourProject);
   }
@@ -37,7 +42,31 @@ public abstract class LightCodeInsightTestCase extends LightPlatformCodeInsightT
     setLanguageLevel(getLanguageLevel());
   }
 
+  /**
+   * Returns a language level for test. Could be overridden for specific behavior.
+   * <p>
+   * This implementation checks the test name. If it ends with JavaXYZ.java and
+   * XYZ is known Java version (e.g. Java1.4.java or Java9.java), then version XYZ is returned.
+   * Otherwise {@link #getDefaultLanguageLevel() default version} is returned.
+   *
+   * @return a project language level for test.
+   */
   protected LanguageLevel getLanguageLevel() {
+    Matcher matcher = JDK_SELECT_PATTERN.matcher(getTestName(false));
+    if(matcher.find()) {
+      LanguageLevel level = LanguageLevel.parse(matcher.group(1));
+      if (level != null) {
+        return level;
+      }
+    }
+
+    return getDefaultLanguageLevel();
+  }
+
+  /**
+   * @return default language level if it's not forced by test name
+   */
+  protected LanguageLevel getDefaultLanguageLevel() {
     return LanguageLevel.HIGHEST;
   }
 

plugins/InspectionGadgets/testsrc/com/siyeh/ig/threading/WhileLoopSpinsOnFieldInspectionFixTest.java

@@ -37,19 +37,13 @@ public class WhileLoopSpinsOnFieldInspectionFixTest extends LightQuickFixParamet
   }
 
   @Override
-  protected LanguageLevel getLanguageLevel() {
-    if(getTestName(false).endsWith("Java9.java")) {
-      return LanguageLevel.JDK_1_9;
-    }
+  protected LanguageLevel getDefaultLanguageLevel() {
     return LanguageLevel.JDK_1_8;
   }
 
   @Override
   protected Sdk getProjectJDK() {
-    if(getTestName(false).endsWith("Java9.java")) {
-      return IdeaTestUtil.getMockJdk9();
-    }
-    return IdeaTestUtil.getMockJdk18();
+    return IdeaTestUtil.getMockJdk9();
   }
 
   public void test() throws Exception {