Add Dockerfile to python test directory

Add initial version of test Dockerfile to python test directory.

third_party/pytest/pycgo/Dockerfile

@@ -0,0 +1,16 @@
+FROM ubuntu
+
+RUN apt-get update >/dev/null && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y make build-essential \
+    libssl-dev zlib1g-dev libbz2-dev \
+    libreadline-dev libsqlite3-dev \
+    wget curl llvm libncurses5-dev libncursesw5-dev \
+    xz-utils tk-dev libffi-dev liblzma-dev python-openssl git
+
+RUN curl https://pyenv.run | bash
+
+ENV PATH="/root/.pyenv/bin:$PATH"
+RUN eval "$(pyenv init -)"
+RUN eval "$(pyenv virtualenv-init -)"
+
+RUN pyenv install 3.6.6

third_party/pytest/pycgo/updateYAML.py

@@ -130,7 +130,7 @@ def updateYAML(location, pathString, newValue):
 
 
 if __name__ == '__main__':
-    location = sys.argv[0]
-    pathString = sys.argv[1]
-    newValue = YAML().load(sys.argv[2])
+    location = sys.argv[1]
+    pathString = sys.argv[2]
+    newValue = YAML().load(sys.argv[3])
     updateYAML(location, pathString, newValue)

third_party/pytest/pycgo/updateYAML_test.py

@@ -30,7 +30,7 @@
 
 
 class TestStringMethods(unittest.TestCase):
-    assets = os.path.dirname(os.path.realpath(__file__)) + "/../../assets"
+    assets = os.path.dirname(os.path.realpath(__file__)) + "/../../../assets"
 
     def test_empty_list_in_getEntryIdxByIdentifier(self):
         self.assertEqual(getEntryIdxByIdentifier([], "name", "foobar"), -1)