core sts endpoints completed

tests/test_sts/test_server.py

@@ -0,0 +1,16 @@
+import sure  # flake8: noqa
+
+import moto.server as server
+
+'''
+Test the different server responses
+'''
+server.configure_urls("sts")
+
+
+def test_sts_get_session_token():
+    test_client = server.app.test_client()
+    res = test_client.get('/?Action=GetSessionToken')
+    res.status_code.should.equal(200)
+    res.data.should.contain("SessionToken")
+    res.data.should.contain("AccessKeyId")