IDEA 142.4859.6: Invalidate library cache in setUp() to prevent access to

ClsFiles invalidated by the previous test

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/confidence/JetConfidenceTest.java

@@ -26,6 +26,7 @@ import com.intellij.openapi.util.text.StringUtil;
 import org.apache.commons.lang.SystemUtils;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.idea.completion.test.TestPackage;
+import org.jetbrains.kotlin.idea.test.TestUtilsKt;
 import org.jetbrains.kotlin.test.InTextDirectivesUtils;
 
 import java.io.File;
@@ -53,6 +54,12 @@ public class JetConfidenceTest extends LightCompletionTestCase {
         doTest();
     }
 
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        TestUtilsKt.invalidateLibraryCache(getProject());
+    }
+
     protected void doTest() {
         boolean completeByChars = CodeInsightSettings.getInstance().SELECT_AUTOPOPUP_SUGGESTIONS_BY_CHARS;