tests: use 'test_must_be_empty' instead of 'test_cmp <empty> <out>'

diff --git a/t/t9903-bash-prompt.sh b/t/t9903-bash-prompt.sh
index c3b89ae783d0b5511718be6d6b9d9978dd9131cd..056bf1dcda95c04e05aa47dbc73f2d45d764c1d8 100755 (executable)
--- a/t/t9903-bash-prompt.sh
+++ b/t/t9903-bash-prompt.sh
@@ -516,10 +516,9 @@ test_expect_success 'prompt - format string starting with dash' '
 
 test_expect_success 'prompt - pc mode' '
        printf "BEFORE: (\${__git_ps1_branch_name}):AFTER\\nmaster" >expected &&
-       printf "" >expected_output &&
        (
                __git_ps1 "BEFORE:" ":AFTER" >"$actual" &&
-               test_cmp expected_output "$actual" &&
+               test_must_be_empty "$actual" &&
                printf "%s\\n%s" "$PS1" "${__git_ps1_branch_name}" >"$actual"
        ) &&
        test_cmp expected "$actual"
@@ -715,13 +714,12 @@ test_expect_success 'prompt - hide if pwd ignored - env var set, config disabled
 '
 
 test_expect_success 'prompt - hide if pwd ignored - env var set, config unset' '
-       printf "" >expected &&
        (
                cd ignored_dir &&
                GIT_PS1_HIDE_IF_PWD_IGNORED=y &&
                __git_ps1 >"$actual"
        ) &&
-       test_cmp expected "$actual"
+       test_must_be_empty "$actual"
 '
 
 test_expect_success 'prompt - hide if pwd ignored - env var set, config unset, pc mode' '