Add gomega matcher for artifact

Signed-off-by: Sunny <darkowlzz@protonmail.com>

Co-authored-by: Hidde Beydals <hello@hidde.co>

controllers/artifact_matchers_test.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2021 The Flux 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 controllers
+
+import (
+	"fmt"
+
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta2"
+	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/types"
+)
+
+// MatchArtifact returns a custom matcher to check equality of a v1beta1.Artifact, the timestamp and URL are ignored.
+func MatchArtifact(expected *sourcev1.Artifact) types.GomegaMatcher {
+	return &matchArtifact{
+		expected: expected,
+	}
+}
+
+type matchArtifact struct {
+	expected *sourcev1.Artifact
+}
+
+func (m matchArtifact) Match(actual interface{}) (success bool, err error) {
+	actualArtifact, ok := actual.(*sourcev1.Artifact)
+	if !ok {
+		return false, fmt.Errorf("actual should be a pointer to an Artifact")
+	}
+
+	if ok, _ := BeNil().Match(m.expected); ok {
+		return BeNil().Match(actual)
+	}
+
+	if ok, err = Equal(m.expected.Path).Match(actualArtifact.Path); !ok {
+		return ok, err
+	}
+	if ok, err = Equal(m.expected.Revision).Match(actualArtifact.Revision); !ok {
+		return ok, err
+	}
+	if ok, err = Equal(m.expected.Checksum).Match(actualArtifact.Checksum); !ok {
+		return ok, err
+	}
+
+	return ok, err
+}
+
+func (m matchArtifact) FailureMessage(actual interface{}) (message string) {
+	return fmt.Sprintf("expected\n\t%#v\nto match\n\t%#v\n", actual, m.expected)
+}
+
+func (m matchArtifact) NegatedFailureMessage(actual interface{}) (message string) {
+	return fmt.Sprintf("expected\n\t%#v\nto not match\n\t%#v\n", actual, m.expected)
+}