[PATCH 5/7] t3701: verify that the diff.algorithm config setting is handled

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

Without this patch, there is actually no test in Git's test suite that
covers the diff.algorithm feature. Let's add one.

We do this by passing a bogus value and then expecting `git diff-files`
to produce the appropriate error message.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t3701-add-interactive.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 797610e96d..f43634102e 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -524,6 +524,16 @@ test_expect_success 'detect bogus diffFilter output' '
 	test_must_fail force_color git add -p <y
 '
 
+test_expect_success 'diff.algorithm is passed to `git diff-files`' '
+	git reset --hard &&
+
+	>file &&
+	git add file &&
+	echo changed >file &&
+	git -c diff.algorithm=bogus add -p 2>err &&
+	test_i18ngrep "error: option diff-algorithm accepts " err
+'
+
 test_expect_success 'patch-mode via -i prompts for files' '
 	git reset --hard &&
 
-- 
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