t5512: add v2 support for "ls-remote --symref" test

Commit b2f73b7 (t5512: compensate for v0 only sending HEAD symrefs,
2019-02-25) configured this test to always run with protocol v0, since
the output is different for v2.

But that means we are not getting any test coverage of the feature with
v2 at all. We could obviously switch to using and expecting v2, but then
that leaves v0 behind (and while we don't use it by default, it's still
important for testing interoperability with older servers). Likewise, we
could switch the expected output based on $GIT_TEST_PROTOCOL_VERSION,
but hardly anybody runs the tests for v0 these days.

Instead, let's explicitly run it for both protocol versions to make sure
they're well behaved. This matches other similar tests added later in
6a139cd (ls-remote: pass heads/tags prefixes to transport,
2018-10-31), etc.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

t/t5512-ls-remote.sh

@@ -244,22 +244,25 @@ test_expect_success 'protocol v2 supports hiderefs' '
 
 test_expect_success 'ls-remote --symref' '
 	git fetch origin &&
-	echo "ref: refs/heads/main	HEAD" >expect &&
+	echo "ref: refs/heads/main	HEAD" >expect.v2 &&
 	generate_references \
 		HEAD \
-		refs/heads/main >>expect &&
+		refs/heads/main >>expect.v2 &&
+	echo "ref: refs/remotes/origin/main	refs/remotes/origin/HEAD" >>expect.v2 &&
 	oid=$(git rev-parse HEAD) &&
-	echo "$oid	refs/remotes/origin/HEAD" >>expect &&
+	echo "$oid	refs/remotes/origin/HEAD" >>expect.v2 &&
 	generate_references \
 		refs/remotes/origin/main \
 		refs/tags/mark \
 		refs/tags/mark1.1 \
 		refs/tags/mark1.10 \
-		refs/tags/mark1.2 >>expect &&
-	# Protocol v2 supports sending symrefs for refs other than HEAD, so use
-	# protocol v0 here.
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref >actual &&
-	test_cmp expect actual
+		refs/tags/mark1.2 >>expect.v2 &&
+	# v0 does not show non-HEAD symrefs
+	grep -v "ref: refs/remotes" <expect.v2 >expect.v0 &&
+	git -c protocol.version=0 ls-remote --symref >actual.v0 &&
+	test_cmp expect.v0 actual.v0 &&
+	git -c protocol.version=2 ls-remote --symref >actual.v2 &&
+	test_cmp expect.v2 actual.v2
 '
 
 test_expect_success 'ls-remote with filtered symref (refname)' '