1 files changed, 99 insertions, 0 deletions
diff --git a/tools/lint/test/test_eslint.py b/tools/lint/test/test_eslint.py
new file mode 100644
index 0000000000..b4fda2fb35
--- /dev/null
+++ b/tools/lint/test/test_eslint.py
@@ -0,0 +1,99 @@
+import mozunit
+import pytest
+from conftest import build
+
+LINTER = "eslint"
+fixed = 0
+
+
+@pytest.fixture
+def eslint(lint):
+    def inner(*args, **kwargs):
+        # --no-ignore is for ESLint to avoid the .eslintignore file.
+        # --ignore-path is because Prettier doesn't have the --no-ignore option
+        # and therefore needs to be given an empty file for the tests to work.
+        kwargs["extra_args"] = [
+            "--no-ignore",
+            "--ignore-path=tools/lint/test/files/eslint/testprettierignore",
+        ]
+        return lint(*args, **kwargs)
+
+    return inner
+
+
+def test_lint_with_global_exclude(lint, config, paths):
+    config["exclude"] = ["subdir", "import"]
+    # This uses lint directly as we need to not ignore the excludes.
+    results = lint(paths(), config=config, root=build.topsrcdir)
+    assert len(results) == 0
+
+
+def test_no_files_to_lint(eslint, config, paths):
+    # A directory with no files to lint.
+    results = eslint(paths("nolint"), root=build.topsrcdir)
+    assert results == []
+
+    # Errors still show up even when a directory with no files is passed in.
+    results = eslint(paths("nolint", "subdir/bad.js"), root=build.topsrcdir)
+    assert len(results) == 1
+
+
+def test_bad_import(eslint, config, paths):
+    results = eslint(paths("import"), config=config, root=build.topsrcdir)
+    assert results == 1
+
+
+def test_eslint_rule(eslint, config, create_temp_file):
+    contents = """var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+"""
+    path = create_temp_file(contents, "bad.js")
+    results = eslint(
+        [path], config=config, root=build.topsrcdir, rules=["no-regex-spaces: error"]
+    )
+
+    assert len(results) == 2
+
+
+def test_eslint_fix(eslint, config, create_temp_file):
+    contents = """/*eslint no-regex-spaces: "error"*/
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+"""
+    path = create_temp_file(contents, "bad.js")
+    eslint([path], config=config, root=build.topsrcdir, fix=True)
+
+    # ESLint returns counts of files fixed, not errors fixed.
+    assert fixed == 1
+
+
+def test_prettier_rule(eslint, config, create_temp_file):
+    contents = """var re = /foobar/;
+    var re = "foo";
+"""
+    path = create_temp_file(contents, "bad.js")
+    results = eslint([path], config=config, root=build.topsrcdir)
+
+    assert len(results) == 1
+
+
+def test_prettier_fix(eslint, config, create_temp_file):
+    contents = """var re = /foobar/;
+    var re = "foo";
+"""
+    path = create_temp_file(contents, "bad.js")
+    eslint([path], config=config, root=build.topsrcdir, fix=True)
+
+    # Prettier returns counts of files fixed, not errors fixed.
+    assert fixed == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()