Add language to fence

Author: adamtheturtle

.travis.yml

@@ -4,6 +4,7 @@ python:
 - '3.6'
 env:
   matrix:
+  - TEST_FILENAME=''
   - TEST_FILENAME=test_add_target.py::TestActiveFlag
   - TEST_FILENAME=test_add_target.py::TestApplicationMetadata
   - TEST_FILENAME=test_add_target.py::TestContentTypes
@@ -48,9 +49,8 @@ install:
 - travis_retry npm install -g markdownlint-cli
 cache: pip
 before_script:
-- make lint
 - python ci/set_secrets_file.py
 script:
-- pytest --exitfirst -vvv tests/mock_vws/"$TEST_FILENAME" --cov=src --cov=tests
+- python ci/run_script.py
 after_success:
 - codecov

CONTRIBUTING.md

@@ -14,7 +14,7 @@ pip install --editable .[dev]
 
 Insall `npm` dependencies for linting Markdown files:
 
-```
+```sh
 npm install -g markdownlint-cli
 ```
 

ci/run_script.py

@@ -0,0 +1,30 @@
+"""
+Run tests and linters on Travis CI.
+"""
+
+import os
+import subprocess
+from pathlib import Path
+
+import pytest
+
+
+def run_test(test_filename: str) -> None:
+    """
+    Run pytest with a given filename.
+    """
+    path = Path('tests') / 'mock_vws' / test_filename
+    pytest.main([
+        '--exitfirst',
+        str(path),
+        '--cov=src',
+        '--cov=tests',
+    ])
+
+
+if __name__ == '__main__':
+    TEST_FILENAME = os.environ.get('TEST_FILENAME')
+    if TEST_FILENAME:
+        run_test(test_filename=TEST_FILENAME)
+    else:
+        subprocess.check_call(['make', 'lint'])