Bug 1579845 - Add a test to the mozlint check: codespell r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D45446

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

tools/lint/codespell.yml

@@ -52,6 +52,8 @@ codespell:
         - tools/docs/
         - tools/lint/
         - tools/tryselect/
+    excludes:
+        - tools/lint/test/test_codespell.py
     # List of extensions coming from:
     # tools/lint/{flake8,eslint}.yml
     # tools/mach_commands.py (clang-format)

tools/lint/test/files/codespell/ignore.rst

@@ -0,0 +1,5 @@
+This is a file with some typos and informations.
+But also testing false positive like optin (because this isn't always option)
+or stuff related to our coding style like:
+aparent (aParent).
+but detects mistakes like mozila

tools/lint/test/python.ini

@@ -13,4 +13,6 @@ skip-if = os == "win"
 [test_file_license.py]
 [test_lintpref.py]
 [test_shellcheck.py]
-[test_rst.py]
+[test_rst.py]
+[test_codespell.py]
+skip-if = os == "win" || os == "mac"  # codespell installed on Linux

tools/lint/test/test_codespell.py

@@ -0,0 +1,24 @@
+from __future__ import absolute_import, print_function
+
+import mozunit
+
+LINTER = 'codespell'
+
+
+def test_lint_codespell(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert results[0].message == 'informations ==> information'
+    assert results[0].level == "error"
+    assert results[0].lineno == 1
+    assert results[0].relpath == "ignore.rst"
+
+    assert results[1].message == "mozila ==> mozilla"
+    assert results[1].level == "error"
+    assert results[1].lineno == 5
+    assert results[1].relpath == "ignore.rst"
+
+
+if __name__ == '__main__':
+    mozunit.main()