1 files changed, 73 insertions, 0 deletions
diff --git a/python/mozbuild/mozbuild/test/backend/test_configenvironment.py b/python/mozbuild/mozbuild/test/backend/test_configenvironment.py
new file mode 100644
index 0000000000..7900cdd737
--- /dev/null
+++ b/python/mozbuild/mozbuild/test/backend/test_configenvironment.py
@@ -0,0 +1,73 @@
+# 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 os
+import unittest
+
+import mozpack.path as mozpath
+from mozunit import main
+
+import mozbuild.backend.configenvironment as ConfigStatus
+from mozbuild.util import ReadOnlyDict
+
+
+class ConfigEnvironment(ConfigStatus.ConfigEnvironment):
+    def __init__(self, *args, **kwargs):
+        ConfigStatus.ConfigEnvironment.__init__(self, *args, **kwargs)
+        # Be helpful to unit tests
+        if "top_srcdir" not in self.substs:
+            if os.path.isabs(self.topsrcdir):
+                top_srcdir = self.topsrcdir.replace(os.sep, "/")
+            else:
+                top_srcdir = mozpath.relpath(self.topsrcdir, self.topobjdir).replace(
+                    os.sep, "/"
+                )
+
+            d = dict(self.substs)
+            d["top_srcdir"] = top_srcdir
+            self.substs = ReadOnlyDict(d)
+
+
+class TestEnvironment(unittest.TestCase):
+    def test_auto_substs(self):
+        """Test the automatically set values of ACDEFINES, ALLSUBSTS
+        and ALLEMPTYSUBSTS.
+        """
+        env = ConfigEnvironment(
+            ".",
+            ".",
+            defines={"foo": "bar", "baz": "qux 42", "abc": "d'e'f"},
+            substs={
+                "FOO": "bar",
+                "FOOBAR": "",
+                "ABC": "def",
+                "bar": "baz qux",
+                "zzz": '"abc def"',
+                "qux": "",
+            },
+        )
+        # Original order of the defines need to be respected in ACDEFINES
+        self.assertEqual(
+            env.substs["ACDEFINES"],
+            """-Dabc='d'\\''e'\\''f' -Dbaz='qux 42' -Dfoo=bar""",
+        )
+        # Likewise for ALLSUBSTS, which also must contain ACDEFINES
+        self.assertEqual(
+            env.substs["ALLSUBSTS"],
+            '''ABC = def
+ACDEFINES = -Dabc='d'\\''e'\\''f' -Dbaz='qux 42' -Dfoo=bar
+FOO = bar
+bar = baz qux
+zzz = "abc def"''',
+        )
+        # ALLEMPTYSUBSTS contains all substs with no value.
+        self.assertEqual(
+            env.substs["ALLEMPTYSUBSTS"],
+            """FOOBAR =
+qux =""",
+        )
+
+
+if __name__ == "__main__":
+    main()