tests/jni: Test for basic object operations.

tests/jni/object.py

+import sys
+import jni
+try:
+    Integer = jni.cls("java/lang/Integer")
+except:
+    print("SKIP")
+    sys.exit()
+
+# Create object
+i = Integer(42)
+print(i)
+# Call object method
+print(i.hashCode())
+# Pass object to another method
+System = jni.cls("java/lang/System")
+System.out.println(i)

tests/jni/object.py.exp

+42
+42
+42