add output to diagnose test issue on MacOS

Author: mawww

.github/workflows/makefile.yml

@@ -1,7 +1,7 @@
 name: Makefile CI
 on:
   push:
-    branches: [ "master" ]
+    branches: [ "master", "fix-test" ]
   pull_request:
     branches: [ "master" ]
 jobs:

test/tools/git/blame-in-diff/rc

@@ -16,8 +16,17 @@ define-command run %{
             # We've jumped to the new version of line 2. Move to the old
             # version so we can annotate the old version of the file.
             execute-keys k
-            git blame
+            echo -to-file /dev/stderr "running git blame"
+            try %{ git blame } catch %{ 
+                echo -to-file /dev/stderr "git blame error"
+                eval -buffer '*debug*' write /dev/stderr
+                echo -to-file fifo
+                fail "oh no"
+            }
+         
+            eval -buffer '*debug*' write /dev/stderr
             hook -once buffer BufCloseFifo .* %{
+                echo "fifo closed" > /dev/stderr
                 execute-keys -client client0 x
                 # Wait for a redraw before reporting completion.
                 hook -once buffer NormalIdle .* %{

test/tools/git/blame-in-diff/script

@@ -1,3 +1,4 @@
 mkfifo fifo 2>/dev/null
 cat fifo
+echo "fifo cat'ed"
 # We should have jumped to the old version of line 2, assert on kak_selection.