completion: add a test for __git_remotes() helper function

The test checks that both remotes under '$GIT_DIR/remotes' and remotes
in the config file are listed.
Signed-off-by: NSZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t9902-completion.sh

@@ -351,6 +351,25 @@ test_expect_success '__gitcomp_nl - doesnt fail because of invalid variable name
 	__gitcomp_nl "$invalid_variable_name"
 '
 
+test_expect_success '__git_remotes - list remotes from $GIT_DIR/remotes and from config file' '
+	cat >expect <<-EOF &&
+	remote_from_file_1
+	remote_from_file_2
+	remote_in_config_1
+	remote_in_config_2
+	EOF
+	test_when_finished "rm -rf .git/remotes" &&
+	mkdir -p .git/remotes &&
+	>.git/remotes/remote_from_file_1 &&
+	>.git/remotes/remote_from_file_2 &&
+	test_when_finished "git remote remove remote_in_config_1" &&
+	git remote add remote_in_config_1 git://remote_1 &&
+	test_when_finished "git remote remove remote_in_config_2" &&
+	git remote add remote_in_config_2 git://remote_2 &&
+	__git_remotes >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'basic' '
 	run_completion "git " &&
 	# built-in