t6030-bisect-porcelain: add tests to control bisect run exit cases

There is a gap on bisect run test coverage related with error exits.
Add two tests to control these error cases.

Signed-off-by: Miriam Rubio <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: mirucam

t/t6030-bisect-porcelain.sh

@@ -962,4 +962,15 @@ test_expect_success 'bisect handles annotated tags' '
 	grep "$bad is the first bad commit" output
 '
 
+test_expect_success 'bisect run fails with exit code equals or greater than 128' '
+	write_script test_script.sh <<-\EOF &&
+	exit 128
+	EOF
+	test_must_fail git bisect run ./test_script.sh &&
+	write_script test_script.sh <<-\EOF &&
+	exit 255
+	EOF
+	test_must_fail git bisect run ./test_script.sh
+'
+
 test_done