t: add tests for "git var"

We do not currently have any explicit tests for "git var" at
all (though we do exercise it to some degree as a part of
other tests). Let's add a few basic sanity checks.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t0007-git-var.sh b/t/t0007-git-var.sh
new file mode 100755 (executable)
index 0000000..5868a87
--- /dev/null
+++ b/t/t0007-git-var.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+
+test_description='basic sanity checks for git var'
+. ./test-lib.sh
+
+test_expect_success 'get GIT_AUTHOR_IDENT' '
+       test_tick &&
+       echo "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE" >expect &&
+       git var GIT_AUTHOR_IDENT >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'get GIT_COMMITTER_IDENT' '
+       test_tick &&
+       echo "$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE" >expect &&
+       git var GIT_COMMITTER_IDENT >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success !AUTOIDENT 'requested identites are strict' '
+       (
+               sane_unset GIT_COMMITTER_NAME &&
+               sane_unset GIT_COMMITTER_EMAIL &&
+               test_must_fail git var GIT_COMMITTER_IDENT
+       )
+'
+
+# For git var -l, we check only a representative variable;
+# testing the whole output would make our test too brittle with
+# respect to unrelated changes in the test suite's environment.
+test_expect_success 'git var -l lists variables' '
+       git var -l >actual &&
+       echo "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE" >expect &&
+       sed -n s/GIT_AUTHOR_IDENT=//p <actual >actual.author &&
+       test_cmp expect actual.author
+'
+
+test_expect_success 'git var -l lists config' '
+       git var -l >actual &&
+       echo false >expect &&
+       sed -n s/core\\.bare=//p <actual >actual.bare &&
+       test_cmp expect actual.bare
+'
+
+test_expect_success 'listing and asking for variables are exclusive' '
+       test_must_fail git var -l GIT_COMMITTER_IDENT
+'
+
+test_done