IDEA-54295 Unify test data path access for all IDEA tests

Provided convenient entry point for accessing test data by Class object of target test class

platform/platform-api/src/com/intellij/openapi/application/ex/PathManagerEx.java

@@ -141,6 +141,19 @@ public class PathManagerEx {
     return getTestDataPath(strategy);
   }
 
+  /**
+   * Shorthand for calling {@link #getTestDataPath(TestDataLookupStrategy)} with strategy obtained via call to
+   * {@link #determineLookupStrategy(Class)} with the given class.
+   *
+   * @param testClass     target test class for which test data should be obtained
+   * @return              base test data directory to use for the given test class
+   * @throws IllegalStateException    as defined by {@link #getTestDataPath(TestDataLookupStrategy)}
+   */
+  public static String getTestDataPath(Class<?> testClass) throws IllegalStateException {
+    TestDataLookupStrategy strategy = determineLookupStrategy(testClass);
+    return getTestDataPath(strategy);
+  }
+
   /**
    * Tries to return test data path for the given lookup strategy.
    *