test-reach: add run_three_modes method

The 'test_three_modes' method assumes we are using the 'test-tool
reach' command for our test. However, we may want to use the data
shape of our commit graph and the three modes (no commit-graph,
full commit-graph, partial commit-graph) for other git commands.

Split test_three_modes to be a simple translation on a more general
run_three_modes method that executes the given command and tests
the actual output to the expected output.

While inspecting this code, I realized that the final test for
'commit_contains --tag' is silently dropping the '--tag' argument.
It should be quoted to include both.

Signed-off-by: Derrick Stolee <[email protected]>

Author: derrickstolee

t/t6600-test-reach.sh

@@ -53,18 +53,22 @@ test_expect_success 'setup' '
 	git config core.commitGraph true
 '
 
-test_three_modes () {
+run_three_modes () {
 	test_when_finished rm -rf .git/objects/info/commit-graph &&
-	test-tool reach $1 <input >actual &&
+	$1 <input >actual &&
 	test_cmp expect actual &&
 	cp commit-graph-full .git/objects/info/commit-graph &&
-	test-tool reach $1 <input >actual &&
+	$1 <input >actual &&
 	test_cmp expect actual &&
 	cp commit-graph-half .git/objects/info/commit-graph &&
-	test-tool reach $1 <input >actual &&
+	$1 <input >actual &&
 	test_cmp expect actual
 }
 
+test_three_modes () {
+	run_three_modes "test-tool reach $1"
+}
+
 test_expect_success 'ref_newer:miss' '
 	cat >input <<-\EOF &&
 	A:commit-5-7
@@ -219,7 +223,7 @@ test_expect_success 'commit_contains:hit' '
 	EOF
 	echo "commit_contains(_,A,X,_):1" >expect &&
 	test_three_modes commit_contains &&
-	test_three_modes commit_contains --tag
+	test_three_modes "commit_contains --tag"
 '
 
 test_expect_success 'commit_contains:miss' '