Be a little more lenient on what constitutes a test case entrypoint (#215)

Also allow "container" (e,g., classes) names to end with "Test." There
are other testing framework derivatives in Python that allow for this,
apparently.

Author: khatchad

com.ibm.wala.cast.python/source/com/ibm/wala/cast/python/ipa/callgraph/PytestEntrypointBuilder.java

@@ -82,7 +82,8 @@ public static boolean isPytestCase(IClass klass) {
           IClass container = dmb.getContainer();
           String containerName = container.getReference().getName().getClassName().toString();
 
-          if (containerName.startsWith("Test") && container instanceof PythonClass) {
+          if ((containerName.startsWith("Test") || containerName.endsWith("Test"))
+              && container instanceof PythonClass) {
             // It's a test class.
             PythonClass containerClass = (PythonClass) container;