ociserver: test how invalid tag list query parameters behave

This particular case ends up as an HTTP 500 "internal server error"
rather than an HTTP 400 "bad request" as it should.
To be fixed in the following commit.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: I9ad01565c1781d4578900370b0927adc1160816a
Reviewed-on: https://review.gerrithub.io/c/cue-labs/oci/+/1216081
TryBot-Result: CUE porcuepine <[email protected]>
Reviewed-by: Roger Peppe <[email protected]>

Author: mvdan

ociregistry/ociserver/registry_test.go

@@ -503,6 +503,13 @@ func TestCalls(t *testing.T) {
 			WantCode:    http.StatusNotFound,
 			WantBody:    `{"errors":[{"code":"NAME_UNKNOWN","message":"repository name not known to registry"}]}`,
 		},
+		{
+			Description: "list_tags_bad_request",
+			Method:      "GET",
+			URL:         "/v2/foo/tags/list?n=INVALID",
+			WantCode:    http.StatusInternalServerError,
+			WantBody:    `{"errors":[{"code":"UNKNOWN","message":"n is not a valid integer: bad request"}]}`,
+		},
 		{
 			Description: "list_repos",
 			Manifests:   map[string]string{"foo/manifests/latest": "foo", "bar/manifests/latest": "bar"},