parse-options: add testcases for OPT_CMDMODE()

Before modifying the implementation, ensure that general operation of
OPT_CMDMODE() and detection of incompatible options are covered.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/helper/test-parse-options.c

@@ -121,6 +121,8 @@ int cmd__parse_options(int argc, const char **argv)
 		OPT_INTEGER('j', NULL, &integer, "get a integer, too"),
 		OPT_MAGNITUDE('m', "magnitude", &magnitude, "get a magnitude"),
 		OPT_SET_INT(0, "set23", &integer, "set integer to 23", 23),
+		OPT_CMDMODE(0, "mode1", &integer, "set integer to 1 (cmdmode option)", 1),
+		OPT_CMDMODE(0, "mode2", &integer, "set integer to 2 (cmdmode option)", 2),
 		OPT_CALLBACK('L', "length", &integer, "str",
 			"get length of <str>", length_callback),
 		OPT_FILENAME('F', "file", &file, "set file to <file>"),

t/t0040-parse-options.sh

@@ -23,6 +23,8 @@ usage: test-tool parse-options <options>
     -j <n>                get a integer, too
     -m, --magnitude <n>   get a magnitude
     --set23               set integer to 23
+    --mode1               set integer to 1 (cmdmode option)
+    --mode2               set integer to 2 (cmdmode option)
     -L, --length <str>    get length of <str>
     -F, --file <file>     set file to <file>
 
@@ -324,6 +326,22 @@ test_expect_success 'OPT_NEGBIT() works' '
 	test-tool parse-options --expect="boolean: 6" -bb --no-neg-or4
 '
 
+test_expect_success 'OPT_CMDMODE() works' '
+	test-tool parse-options --expect="integer: 1" --mode1
+'
+
+test_expect_success 'OPT_CMDMODE() detects incompatibility' '
+	test_must_fail test-tool parse-options --mode1 --mode2 >output 2>output.err &&
+	test_must_be_empty output &&
+	test_i18ngrep "incompatible with --mode" output.err
+'
+
+test_expect_success 'OPT_CMDMODE() detects incompatibility with something else' '
+	test_must_fail test-tool parse-options --set23 --mode2 >output 2>output.err &&
+	test_must_be_empty output &&
+	test_i18ngrep "incompatible with something else" output.err
+'
+
 test_expect_success 'OPT_COUNTUP() with PARSE_OPT_NODASH works' '
 	test-tool parse-options --expect="boolean: 6" + + + + + +
 '