Only run TestGetImageConfigStopSignal on Linux

... because the implementation requires Linux-only pkg/signal

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

pkg/util/utils_linux_test.go

@@ -0,0 +1,29 @@
+package util
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetImageConfigStopSignal(t *testing.T) {
+	// Linux-only beause parsing signal names is not supported on non-Linux systems by
+	// pkg/signal.
+	stopSignalValidInt, err := GetImageConfig([]string{"STOPSIGNAL 9"})
+	require.Nil(t, err)
+	assert.Equal(t, stopSignalValidInt.StopSignal, "9")
+
+	stopSignalValidString, err := GetImageConfig([]string{"STOPSIGNAL SIGKILL"})
+	require.Nil(t, err)
+	assert.Equal(t, stopSignalValidString.StopSignal, "9")
+
+	_, err = GetImageConfig([]string{"STOPSIGNAL 0"})
+	assert.NotNil(t, err)
+
+	_, err = GetImageConfig([]string{"STOPSIGNAL garbage"})
+	assert.NotNil(t, err)
+
+	_, err = GetImageConfig([]string{"STOPSIGNAL "})
+	assert.NotNil(t, err)
+}