1 files changed, 65 insertions, 0 deletions
diff --git a/testing/mozbase/mozdebug/tests/test.py b/testing/mozbase/mozdebug/tests/test.py
new file mode 100644
index 0000000000..57bbfec95d
--- /dev/null
+++ b/testing/mozbase/mozdebug/tests/test.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+import os
+
+import mozunit
+import pytest
+from mozdebug.mozdebug import (
+    _DEBUGGER_PRIORITIES,
+    DebuggerSearch,
+    get_default_debugger_name,
+)
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+
+@pytest.fixture
+def set_debuggers(monkeypatch):
+    debugger_dir = os.path.join(here, "fake_debuggers")
+
+    def _set_debuggers(*debuggers):
+        dirs = []
+        for d in debuggers:
+            if d.endswith(".exe"):
+                d = d[: -len(".exe")]
+            dirs.append(os.path.join(debugger_dir, d))
+        monkeypatch.setenv("PATH", os.pathsep.join(dirs))
+
+    return _set_debuggers
+
+
+@pytest.mark.parametrize("os_name", ["android", "linux", "mac", "win", "unknown"])
+def test_default_debugger_name(os_name, set_debuggers, monkeypatch):
+    import sys
+
+    import mozinfo
+
+    def update_os_name(*args, **kwargs):
+        mozinfo.info["os"] = os_name
+
+    monkeypatch.setattr(mozinfo, "find_and_update_from_json", update_os_name)
+
+    if sys.platform == "win32":
+        # This is used so distutils.spawn.find_executable doesn't add '.exe'
+        # suffixes to all our dummy binaries on Windows.
+        monkeypatch.setattr(sys, "platform", "linux")
+
+    debuggers = _DEBUGGER_PRIORITIES[os_name][:]
+    debuggers.reverse()
+    first = True
+    while len(debuggers) > 0:
+        set_debuggers(*debuggers)
+
+        if first:
+            assert get_default_debugger_name() == debuggers[-1]
+            first = False
+        else:
+            assert get_default_debugger_name() is None
+            assert (
+                get_default_debugger_name(DebuggerSearch.KeepLooking) == debuggers[-1]
+            )
+        debuggers = debuggers[:-1]
+
+
+if __name__ == "__main__":
+    mozunit.main()