Bug 1598615 - Ride along: add tests for rst r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D54499

--HG--
extra : moz-landing-system : lando

tools/lint/test/files/rst/bad.rst

@@ -0,0 +1,20 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+
+Whitespace
+~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+

tools/lint/test/files/rst/bad2.rst

@@ -0,0 +1,4 @@
+====
+Test
+===
+

tools/lint/test/files/rst/good.rst

@@ -0,0 +1,11 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+

tools/lint/test/python.ini

@@ -13,3 +13,4 @@ skip-if = os == "win"
 [test_file_license.py]
 [test_lintpref.py]
 [test_shellcheck.py]
+[test_rst.py]

tools/lint/test/test_rst.py

@@ -0,0 +1,23 @@
+import pytest
+import mozunit
+from mozfile import which
+
+LINTER = 'rst'
+pytestmark = pytest.mark.skipif(not which('rstcheck'), reason="rstcheck is not installed")
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert "Title underline too short" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.rst"
+
+    assert "Title overline & underline mismatch" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "bad2.rst"
+
+
+if __name__ == '__main__':
+    mozunit.main()