Add label selector flag to get cmd

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

cmd/flux/get_test.go

@@ -0,0 +1,61 @@
+//go:build unit
+// +build unit
+
+/*
+Copyright 2023 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 Test_GetCmd(t *testing.T) {
+	tmpl := map[string]string{
+		"fluxns": allocateNamespace("flux-system"),
+	}
+	testEnv.CreateObjectFile("./testdata/get/objects.yaml", tmpl, t)
+
+	tests := []struct {
+		name     string
+		args     string
+		expected string
+	}{
+		{
+			name:     "no label selector",
+			expected: "testdata/get/get.golden",
+		},
+		{
+			name:     "equal label selector",
+			args:     "-l sharding.fluxcd.io/key=shard1",
+			expected: "testdata/get/get_label_one.golden",
+		},
+		{
+			name:     "notin label selector",
+			args:     `-l "sharding.fluxcd.io/key notin (shard1, shard2)"`,
+			expected: "testdata/get/get_label_two.golden",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := cmdTestCase{
+				args:   "get sources git " + tt.args + " -n " + tmpl["fluxns"],
+				assert: assertGoldenTemplateFile(tt.expected, nil),
+			}
+
+			cmd.runTestCmd(t)
+		})
+	}
+}