add testing.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

plugin_test.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+
+	"testing"
+)
+
+func TestMissingConfig(t *testing.T) {
+	var plugin Plugin
+
+	err := plugin.Exec()
+
+	assert.NotNil(t, err)
+}
+
+func TestMissingSSHConfig(t *testing.T) {
+	plugin := Plugin{
+		Config: Config{
+			Host:     "example.com",
+			Username: "ubuntu",
+		},
+	}
+
+	err := plugin.Exec()
+
+	assert.NotNil(t, err)
+}
+
+func TestTrimElement(t *testing.T) {
+	var input, result []string
+
+	input = []string{"1", "     ", "3"}
+	result = []string{"1", "3"}
+
+	assert.Equal(t, result, trimPath(input))
+
+	input = []string{"1", "2"}
+	result = []string{"1", "2"}
+
+	assert.Equal(t, result, trimPath(input))
+}