Revert "XXX: Temporarily disable tests"

This reverts commit bfae8d9.

Author: steve-s

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/engine/SharedEngineMultithreadingBenchmarkTest.java

@@ -49,13 +49,11 @@
 
 import org.graalvm.polyglot.Engine;
 import org.graalvm.polyglot.Source;
-import org.junit.Ignore;
 import org.junit.Test;
 
 import com.oracle.graal.python.test.PythonTests;
 
 public class SharedEngineMultithreadingBenchmarkTest extends SharedEngineMultithreadingTestBase {
-    @Ignore
     @Test
     public void testRichardsInParallelInMultipleContexts() throws Throwable {
         try (Engine engine = Engine.newBuilder().build()) {

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/engine/SharedEngineMultithreadingImportsTest.java

@@ -46,13 +46,11 @@
 
 import org.graalvm.polyglot.Engine;
 import org.junit.Assert;
-import org.junit.Ignore;
 import org.junit.Test;
 
 public class SharedEngineMultithreadingImportsTest extends SharedEngineMultithreadingTestBase {
     private static final int RUNS_COUNT = RUNS_COUNT_FACTOR;
 
-    @Ignore
     @Test
     public void testImportsInParallel() throws InterruptedException, ExecutionException {
         ExecutorService executorService = createExecutorService();

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/engine/SharedEngineMultithreadingShapeTransitionsTest.java

@@ -51,15 +51,13 @@
 import org.graalvm.polyglot.Source;
 import org.graalvm.polyglot.Value;
 import org.junit.Assert;
-import org.junit.Ignore;
 import org.junit.Test;
 
 public class SharedEngineMultithreadingShapeTransitionsTest extends SharedEngineMultithreadingTestBase {
     private static final int RUNS_COUNT = RUNS_COUNT_FACTOR;
     private static final int PROPERTIES_COUNT = 20;
     private static final int SHARED_PREFIX_COUNT = PROPERTIES_COUNT - 10;
 
-    @Ignore
     @Test
     public void testShapeTransitionsInParallel() throws InterruptedException, ExecutionException {
         ExecutorService executorService = createExecutorService();

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/engine/SharedEngineMultithreadingSimpleLambdaTest.java

@@ -47,13 +47,11 @@
 import org.graalvm.polyglot.Source;
 import org.graalvm.polyglot.Value;
 import org.junit.Assert;
-import org.junit.Ignore;
 import org.junit.Test;
 
 public class SharedEngineMultithreadingSimpleLambdaTest extends SharedEngineMultithreadingTestBase {
     private static final int RUNS_COUNT = 2 * RUNS_COUNT_FACTOR;
 
-    @Ignore
     @Test
     public void testLambdaInParallelCtxCreatedInMainThread() throws InterruptedException, ExecutionException {
         ExecutorService executorService = createExecutorService();
@@ -85,7 +83,6 @@ public void testLambdaInParallelCtxCreatedInMainThread() throws InterruptedExcep
         }
     }
 
-    @Ignore
     @Test
     public void testLambdaInParallelCtxCreatedInWorkerThread() throws InterruptedException, ExecutionException {
         ExecutorService executorService = createExecutorService();
@@ -112,7 +109,6 @@ public void testLambdaInParallelCtxCreatedInWorkerThread() throws InterruptedExc
         }
     }
 
-    @Ignore
     @Test
     public void testLambdaInParallelSharedContexts() throws InterruptedException, ExecutionException {
         ExecutorService executorService = createExecutorService();