add test for empty file content case

Author: kmoe

local/resource_local_file_test.go

@@ -152,5 +152,57 @@ resource "local_file" "file" {
 	})
 
 	defer os.Remove(destinationDirPath)
+}
+
+func TestLocalFile_EmptyContent(t *testing.T) {
+	var cases = []struct {
+		path    string
+		content string
+		config  string
+	}{
+		{
+			"local_file",
+			"This is some content",
+			`resource "local_file" "file" {
+         content     = "This is some content"
+         filename    = "local_file"
+      }`,
+		},
+		{
+			"local_file",
+			"",
+			`resource "local_file" "file" {
+         content     = ""
+         filename    = "local_file"
+      }`,
+		},
+	}
 
+	for _, tt := range cases {
+		r.UnitTest(t, r.TestCase{
+			Providers: testProviders,
+			Steps: []r.TestStep{
+				{
+					Config: tt.config,
+					Check: func(s *terraform.State) error {
+						content, err := ioutil.ReadFile(tt.path)
+						if err != nil {
+							return fmt.Errorf("config:\n%s\n,got: %s\n", tt.config, err)
+						}
+						if string(content) != tt.content {
+							return fmt.Errorf("config:\n%s\ngot:\n%s\nwant:\n%s\n", tt.config, content, tt.content)
+						}
+						return nil
+					},
+					Destroy: false,
+				},
+			},
+			CheckDestroy: func(*terraform.State) error {
+				if _, err := os.Stat(tt.path); os.IsNotExist(err) {
+					return nil
+				}
+				return errors.New("local_file did not get destroyed")
+			},
+		})
+	}
 }