Fix maven test on parallel execution: don't miss to create dir

idea/idea-maven/test/org/jetbrains/kotlin/idea/maven/MavenTestCase.java

@@ -41,6 +41,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.idea.maven.indices.MavenIndicesManager;
 import org.jetbrains.idea.maven.project.*;
 import org.jetbrains.idea.maven.server.MavenServerManager;
+import org.jetbrains.kotlin.test.KotlinTestUtils;
 
 import java.awt.*;
 import java.io.File;
@@ -90,6 +91,8 @@ public abstract class MavenTestCase extends UsefulTestCase {
     protected void setUp() throws Exception {
         super.setUp();
 
+        myDir = KotlinTestUtils.tmpDir(getTestName(false));
+        
         setUpFixtures();
 
         myProject = myTestFixture.getProject();