test-lib: Make the test_external_* functions TAP-aware

diff --git a/t/t2012-checkout-last.sh b/t/t2012-checkout-last.sh
index 87b30a268c66848726baec5676e73b8db686806d..b44de9dc623fc923941b61719f445170602e21be 100755 (executable)
--- a/t/t2012-checkout-last.sh
+++ b/t/t2012-checkout-last.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-test_description='checkout can switch to last branch'
+test_description='checkout can switch to last branch and merge base'
 
 . ./test-lib.sh
 
@@ -91,4 +91,29 @@ test_expect_success 'switch to twelfth from the last' '
        test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch13"
 '
 
+test_expect_success 'merge base test setup' '
+       git checkout -b another other &&
+       echo "hello again" >>world &&
+       git add world &&
+       git commit -m third
+'
+
+test_expect_success 'another...master' '
+       git checkout another &&
+       git checkout another...master &&
+       test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+'
+
+test_expect_success '...master' '
+       git checkout another &&
+       git checkout ...master &&
+       test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+'
+
+test_expect_success 'master...' '
+       git checkout another &&
+       git checkout master... &&
+       test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+'
+
 test_done