1 files changed, 70 insertions, 0 deletions
diff --git a/toolkit/components/glean/tests/pytest/test_glean_parser_cpp.py b/toolkit/components/glean/tests/pytest/test_glean_parser_cpp.py
new file mode 100644
index 0000000000..05fd691782
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+++ b/toolkit/components/glean/tests/pytest/test_glean_parser_cpp.py
@@ -0,0 +1,70 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import io
+import sys
+from os import path
+from pathlib import Path
+
+import mozunit
+from expect_helper import expect
+
+# Shenanigans to import the cpp outputter extension
+FOG_ROOT_PATH = path.abspath(
+    path.join(path.dirname(__file__), path.pardir, path.pardir)
+)
+sys.path.append(path.join(FOG_ROOT_PATH, "build_scripts", "glean_parser_ext"))
+import cpp
+import run_glean_parser
+
+
+def test_all_metric_types():
+    """Honestly, this is a pretty bad test.
+    It generates C++ for a given test metrics.yaml and compares it byte-for-byte
+    with an expected output C++ file.
+    Expect it to be fragile.
+    To generate new expected output files, set `UPDATE_EXPECT=1` when running the test suite:
+
+    UPDATE_EXPECT=1 mach test toolkit/components/glean/pytest
+    """
+
+    options = {"allow_reserved": False}
+    input_files = [Path(path.join(path.dirname(__file__), "metrics_test.yaml"))]
+
+    all_objs, options = run_glean_parser.parse_with_options(input_files, options)
+
+    output_fd = io.StringIO()
+    cpp.output_cpp(all_objs, output_fd, options)
+
+    expect(
+        path.join(path.dirname(__file__), "metrics_test_output_cpp"),
+        output_fd.getvalue(),
+    )
+
+
+def test_fake_pings():
+    """Another similarly-fragile test.
+    It generates C++ for pings_test.yaml, comparing it byte-for-byte
+    with an expected output C++ file `pings_test_output_cpp`.
+    Expect it to be fragile.
+    To generate new expected output files, set `UPDATE_EXPECT=1` when running the test suite:
+
+    UPDATE_EXPECT=1 mach test toolkit/components/glean/pytest
+    """
+
+    options = {"allow_reserved": False}
+    input_files = [Path(path.join(path.dirname(__file__), "pings_test.yaml"))]
+
+    all_objs, options = run_glean_parser.parse_with_options(input_files, options)
+
+    output_fd = io.StringIO()
+    cpp.output_cpp(all_objs, output_fd, options)
+
+    expect(
+        path.join(path.dirname(__file__), "pings_test_output_cpp"), output_fd.getvalue()
+    )
+
+
+if __name__ == "__main__":
+    mozunit.main()