Pass problematic tests (#83)

That way, when we fix the bug, the tests will fail, in which case we will know that our fix is working. Also, we won't forget to uncomment the problematic tests.

com.ibm.wala.cast.python.ml.test/source/com/ibm/wala/cast/python/ml/test/TestTensorflowModel.java

@@ -17,6 +17,7 @@
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -105,8 +106,11 @@ public void testTf2()
     testTf2("tf2p2.py", "value_index", 2, 4, 2, 3);
     testTf2("tf2q.py", "add", 2, 3, 2, 3);
     testTf2("tf2r.py", "add", 2, 3, 2, 3);
-    // TODO: Uncomment below test when https://github.com/wala/ML/issues/65 is fixed.
-    // testTf2("tf2s.py", "add", 2, 3, 2, 3);
+    testTf2(
+        "tf2s.py", "add", 0,
+        0); // NOTE: Set the expected number of tensor parameters, variables, and tensor parameter
+    // value numbers to 2, 3, and 2 and 3, respectively, when
+    // https://github.com/wala/ML/issues/65 is fixed.
     testTf2("tf2t.py", "add", 2, 3, 2, 3);
     testTf2("tf2u.py", "add", 2, 3, 2, 3);
     testTf2("tf2u2.py", "add", 2, 3, 2, 3);
@@ -245,7 +249,8 @@ private void testTf2(
     final String functionSignature = "script " + filename + "." + functionName + ".do()LRoot;";
 
     // get the pointer keys for the function.
-    Set<LocalPointerKey> functionPointerKeys = methodSignatureToPointerKeys.get(functionSignature);
+    Set<LocalPointerKey> functionPointerKeys =
+        methodSignatureToPointerKeys.getOrDefault(functionSignature, Collections.emptySet());
 
     // check tensor parameters.
     assertEquals(expectedNumberOfTensorParameters, functionPointerKeys.size());
@@ -261,7 +266,8 @@ private void testTf2(
         .forEach(ev -> actualValueNumberSet.contains(ev));
 
     // get the tensor variables for the function.
-    Set<TensorVariable> functionTensors = methodSignatureToTensorVariables.get(functionSignature);
+    Set<TensorVariable> functionTensors =
+        methodSignatureToTensorVariables.getOrDefault(functionSignature, Collections.emptySet());
 
     // check tensor parameters.
     assertEquals(expectedNumberOfTensorParameters, functionTensors.size());