added test for stopsignal command implementation

pkg/commands/stopsignal_test.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2018 Google LLC
+
+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 commands
+
+import (
+	"testing"
+
+	"github.com/GoogleContainerTools/kaniko/testutil"
+	"github.com/docker/docker/builder/dockerfile/instructions"
+	"github.com/google/go-containerregistry/v1"
+)
+
+var stopsignalTests = []struct {
+	signal         string
+	expectedSignal string
+}{
+	{
+		signal:         "SIGKILL",
+		expectedSignal: "SIGKILL",
+	},
+	{
+		signal:         "${STOPSIG}",
+		expectedSignal: "SIGKILL",
+	},
+	{
+		signal:         "1",
+		expectedSignal: "1",
+	},
+}
+
+func TestStopsignalExecuteCmd(t *testing.T) {
+
+	cfg := &v1.Config{
+		StopSignal: "",
+		Env:        []string{"STOPSIG=SIGKILL"},
+	}
+
+	for _, test := range stopsignalTests {
+		cmd := StopSignalCommand{
+			&instructions.StopSignalCommand{
+				Signal: test.signal,
+			},
+		}
+		err := cmd.ExecuteCommand(cfg)
+		testutil.CheckErrorAndDeepEqual(t, false, err, test.expectedSignal, cfg.StopSignal)
+	}
+}