Add tests for source oci command

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

cmd/flux/create_source_oci_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2022 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 main
+
+import (
+	"testing"
+)
+
+func TestCreateSourceOCI(t *testing.T) {
+	tests := []struct {
+		name       string
+		args       string
+		assertFunc assertFunc
+	}{
+		{
+			name:       "NoArgs",
+			args:       "create source oci",
+			assertFunc: assertError("name is required"),
+		},
+		{
+			name:       "NoURL",
+			args:       "create source oci podinfo",
+			assertFunc: assertError("url is required"),
+		},
+		{
+			name:       "export manifest",
+			args:       "create source oci podinfo --url=ghcr.io/stefanprodan/manifests/podinfo --tag=6.1.6 --interval 10m --export",
+			assertFunc: assertGoldenFile("./testdata/oci/export.golden"),
+		},
+		{
+			name:       "export manifest with secret",
+			args:       "create source oci podinfo --url=ghcr.io/stefanprodan/manifests/podinfo --tag=6.1.6 --interval 10m --secret-ref=creds --export",
+			assertFunc: assertGoldenFile("./testdata/oci/export_with_secret.golden"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := cmdTestCase{
+				args:   tt.args,
+				assert: tt.assertFunc,
+			}
+
+			cmd.runTestCmd(t)
+		})
+	}
+}