Configure en_US.UTF-8 locale on Docker, closes #1654

Also unit tests how `shprint()` handles unicode command output.

Author: AndreMiras

Dockerfile.py2

@@ -19,6 +19,14 @@ FROM ubuntu:18.04
 
 ENV ANDROID_HOME="/opt/android"
 
+# configure locale
+RUN apt update -qq > /dev/null && apt install -qq --yes --no-install-recommends \
+    locales && \
+    locale-gen en_US.UTF-8
+ENV LANG="en_US.UTF-8" \
+    LANGUAGE="en_US.UTF-8" \
+    LC_ALL="en_US.UTF-8"
+
 RUN apt -y update -qq \
     && apt -y install -qq --no-install-recommends curl unzip ca-certificates \
     && apt -y autoremove

Dockerfile.py3

@@ -19,6 +19,14 @@ FROM ubuntu:18.04
 
 ENV ANDROID_HOME="/opt/android"
 
+# configure locale
+RUN apt update -qq > /dev/null && apt install -qq --yes --no-install-recommends \
+    locales && \
+    locale-gen en_US.UTF-8
+ENV LANG="en_US.UTF-8" \
+    LANGUAGE="en_US.UTF-8" \
+    LC_ALL="en_US.UTF-8"
+
 RUN apt -y update -qq \
     && apt -y install -qq --no-install-recommends curl unzip ca-certificates \
     && apt -y autoremove

tests/test_logger.py

@@ -0,0 +1,18 @@
+import unittest
+from mock import MagicMock
+from pythonforandroid import logger
+
+
+class TestShprint(unittest.TestCase):
+
+    def test_unicode_encode(self):
+        """
+        Makes sure `shprint()` can handle unicode command output.
+        Running the test with PYTHONIOENCODING=ASCII env would fail, refs:
+        https://github.com/kivy/python-for-android/issues/1654
+        """
+        expected_command_output = ["foo\xa0bar"]
+        command = MagicMock()
+        command.return_value = expected_command_output
+        output = logger.shprint(command, 'a1', k1='k1')
+        self.assertEqual(output, expected_command_output)