From fa929b47148cfb19877a25ab128686ca4ae0208f Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Sat, 11 Jul 2020 21:00:45 +0300
Subject: Check that hg is actually working.

---
 run_unittests.py | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/run_unittests.py b/run_unittests.py
index 5fd790c42..820b705b5 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -2834,9 +2834,25 @@ class AllPlatformTests(BasePlatformTests):
             # fails sometimes.
             pass
 
-    def test_dist_hg(self):
+    def has_working_hg(self):
         if not shutil.which('hg'):
-            raise unittest.SkipTest('Mercurial not found')
+            return False
+        try:
+            # This check should not be necessary, but
+            # CI under macOS passes the above test even
+            # though Mercurial is not installed.
+            if subprocess.call(['hg', '--version'],
+                               stdout=subprocess.DEVNULL,
+                               stderr=subprocess.DEVNULL) != 0:
+                return False
+            return True
+        except FileNotFoundError:
+            return False
+
+
+    def test_dist_hg(self):
+        if not self.has_working_hg():
+            raise unittest.SkipTest('Mercurial not found or broken.')
         if self.backend is not Backend.ninja:
             raise unittest.SkipTest('Dist is only supported with Ninja')
 
-- 
cgit v1.2.3