test: add a fuzz test

pkg/utils/utils_fuzz_test.go

@@ -0,0 +1,31 @@
+/*
+Copyright The Ratify Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package utils
+
+import "testing"
+
+func FuzzParseSubjectReference(f *testing.F) {
+	testcases := []string{"localhost:5000/net&monitor:v1", "prom/prometheus", "net-monitor@sha256:a0fc570a245b09ed752c42d600ee3bb5b4f77bbd70d8898780b7ab43454530eb"}
+	for _, tc := range testcases {
+		f.Add(tc)
+	}
+	f.Fuzz(func(t *testing.T, input string) {
+		_, err := ParseSubjectReference(input)
+		if err != nil {
+			return
+		}
+	})
+}