diff --git a/go.mod b/go.mod
index a935e06..fc33f46 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module google-chat-action
 
 go 1.26.2
 
-require github.com/sethvargo/go-githubactions v1.3.2
+require (
+	github.com/google/go-cmp v0.7.0
+	github.com/sethvargo/go-githubactions v1.3.2
+)
diff --git a/main.go b/main.go
index de1485c..d9360bb 100644
--- a/main.go
+++ b/main.go
@@ -99,7 +99,7 @@ func main() {
 
 	jsonStr, err := card(data)
 	if err != nil {
-		githubactions.Fatalf(err.Error())
+		githubactions.Fatalf("error %s", err.Error())
 	}
 
 	req, err := http.NewRequest("POST", webhook, bytes.NewBuffer(jsonStr))
@@ -134,40 +134,41 @@ func card(d templateData) ([]byte, error) {
 		d.EventBody = "<b>Project:</b> {{ .Project }}<br><b>Commit-id:</b>  <font color=\"#FF0000\">{{ .Commit }}</font><br><b>Branch:</b> <font color=\"#00FF00f\">{{ .Branch }}</font><br><b>Build Status:</b> <font color=\"#0000ff\">{{ .Status }}</font>"
 	}
 
-	//data := `{
-	//    "cards": [
+	//	tpl := `
+	//{
+	//  "cards": [
+	//    {
+	//      "header": {
+	//        "title": "{{ .Title }}",
+	//        "subtitle": "{{ .SubTitle }}",
+	//        "imageUrl": "{{ .IconUrl }}",
+	//        "imageStyle": "IMAGE"
+	//      },
+	//      "sections": [
 	//        {
-	//            "header": {
-	//                "title": "{{ .Title }}",
-	//                "subtitle": "{{ .SubTitle }}",
-	//                "imageUrl": "{{ .IconUrl }}",
-	//                "imageStyle": "IMAGE"
-	//            },
-	//            "sections": [
+	//          "widgets": [
+	//            {
+	//              "textParagraph": {
+	//                "text": "<b>Project:</b> {{ .Project }}<br><b>Commit-id:</b>  <font color=\"#FF0000\">{{ .Commit }}</font><br><b>Branch:</b> <font color=\"#00FF00f\">{{ .Branch }}</font><br><b>Build Status:</b> <font color=\"#0000ff\">{{ .Status }}</font>"
+	//              },
+	//              "buttons": [
 	//                {
-	//                    "widgets": [
-	//                        {
-	//                            "textParagraph": {
-	//                                "text": "<b>Project:</b> {{ .Project }}<br><b>Commit-id:</b>  <font color=\"#FF0000\">{{ .Commit }}</font><br><b>Branch:</b> <font color=\"#00FF00f\">{{ .Branch }}</font><br><b>Build Status:</b> <font color=\"#0000ff\">{{ .Status }}</font>"
-	//                            },
-	//                            "buttons": [
-	//                                {
-	//                                    "textButton": {
-	//                                        "text": "Job Details",
-	//                                        "onClick": {
-	//                                            "openLink": {
-	//                                                "url": "{{ .GitURL }}/{{ .Project }}/actions/runs/{{ .ActionID }}"
-	//                                            }
-	//                                        }
-	//                                    }
-	//                                }
-	//                            ]
-	//                        }
-	//                    ]
+	//                  "textButton": {
+	//                    "text": "Job Details",
+	//                    "onClick": {
+	//                      "openLink": {
+	//                        "url": "{{ .GitURL }}/{{ .Project }}/actions/runs/{{ .ActionID }}"
+	//                      }
+	//                    }
+	//                  }
 	//                }
-	//            ]
+	//              ]
+	//            }
+	//          ]
 	//        }
-	//    ]
+	//      ]
+	//    }
+	//  ]
 	//}`
 
 	if d.Status == "success" {
@@ -199,64 +200,64 @@ func card(d templateData) ([]byte, error) {
 	}
 
 	tpl := `
-{ 
-  "cardsV2": [ 
-    { 
-      "cardId": "notify-{{ .ActionID }}", 
-      "card": {
-        "header": {
-			"title": "{{ .Title }}",
-			"subtitle": "{{ .SubTitle }}",
-			"imageUrl": "{{ .IconUrl }}",
-	  		"imageType": "SQUARE"
-        },
-        "sections": [
-          {
-            "header": "{{ .Title }}",
-            "collapsible": false,
-            "widgets": [
-              {{ .Add }}
-              {
-                "decoratedText": {
-                  "startIcon": {
-                    "knownIcon": "PERSON"
-                  },
-                  "text": "<b>{{ .Author }}</b>"
-                }
-              },
-              {
-                "textParagraph": {
-                  "text": "{{ .EventBody }}",
-                  "maxLines": 2
-                }
-              }
-            ]
-          },
-          {
-            "widgets": [
-              {
-                "buttonList": {
-                  "buttons": [
-                    {
-                      "text": "View Source Event",
-                      "type": "FILLED",
-                      "onClick": {
-                        "openLink": {
-                          "url": "{{ .GitURL }}/{{ .Project }}/actions/runs/{{ .ActionID }}"
-                        }
-                      }
-                    }
-                  ]
-                }
-              }
-            ]
-          }
-        ]
-      }
-    } 
-  ] 
-}
-`
+	{
+	 "cardsV2": [
+	   {
+	     "cardId": "notify-{{ .ActionID }}",
+	     "card": {
+	       "header": {
+				"title": "{{ .Title }}",
+				"subtitle": "{{ .SubTitle }}",
+				"imageUrl": "{{ .IconUrl }}",
+		  		"imageType": "SQUARE"
+	       },
+	       "sections": [
+	         {
+	           "header": "{{ .Title }}",
+	           "collapsible": false,
+	           "widgets": [
+	             {{ .Add }}
+	             {
+	               "decoratedText": {
+	                 "startIcon": {
+	                   "knownIcon": "PERSON"
+	                 },
+	                 "text": "<b>{{ .Author }}</b>"
+	               }
+	             },
+	             {
+	               "textParagraph": {
+	                 "text": "{{ .EventBody }}",
+	                 "maxLines": 2
+	               }
+	             }
+	           ]
+	         },
+	         {
+	           "widgets": [
+	             {
+	               "buttonList": {
+	                 "buttons": [
+	                   {
+	                     "text": "View Source Event",
+	                     "type": "FILLED",
+	                     "onClick": {
+	                       "openLink": {
+	                         "url": "{{ .GitURL }}/{{ .Project }}/actions/runs/{{ .ActionID }}"
+	                       }
+	                     }
+	                   }
+	                 ]
+	               }
+	             }
+	           ]
+	         }
+	       ]
+	     }
+	   }
+	 ]
+	}
+	`
 	tmpl, err := template.New("").Parse(tpl)
 	if err != nil {
 		return nil, err
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..c7bcd29
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,138 @@
+package main
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func Test_card(t *testing.T) {
+	type args struct {
+		d templateData
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    []byte
+		wantErr bool
+	}{
+		{
+			name: "test one",
+			args: args{
+				d: templateData{
+					Title:     "test",
+					SubTitle:  "first test",
+					Author:    "gotest",
+					IconUrl:   "https://github.githubassets.com/images/modules/logos_page/Octocat.png",
+					Project:   "proj",
+					Commit:    "12345",
+					Branch:    "main",
+					Status:    "success",
+					ActionID:  "123",
+					GitURL:    "https://test.url",
+					Color:     "c0c0c0",
+					EventBody: "no body",
+				},
+			},
+			want: []byte(`
+{
+ "cardsV2": [
+   {
+	 "cardId": "notify-123",
+	 "card": {
+	   "header": {
+			"title": "test",
+			"subtitle": "first test",
+			"imageUrl": "https://github.githubassets.com/images/modules/logos_page/Octocat.png",
+			"imageType": "SQUARE"
+	   },
+	   "sections": [
+		 {
+		   "header": "test",
+		   "collapsible": false,
+		   "widgets": [
+			 
+{
+"decoratedText": {
+"startIcon": {
+  "materialIcon": {
+	"name": "check_circle"
+  }
+},
+"text": "<b style=\"color: green;\">SUCCESS</b>"
+}
+},
+			 {
+			   "decoratedText": {
+				 "startIcon": {
+				   "knownIcon": "PERSON"
+				 },
+				 "text": "<b>gotest</b>"
+			   }
+			 },
+			 {
+			   "textParagraph": {
+				 "text": "no body",
+				 "maxLines": 2
+			   }
+			 }
+		   ]
+		 },
+		 {
+		   "widgets": [
+			 {
+			   "buttonList": {
+				 "buttons": [
+				   {
+					 "text": "View Source Event",
+					 "type": "FILLED",
+					 "onClick": {
+					   "openLink": {
+						 "url": "https://test.url/proj/actions/runs/123"
+					   }
+					 }
+				   }
+				 ]
+			   }
+			 }
+		   ]
+		 }
+	   ]
+	 }
+   }
+ ]
+}
+`),
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := card(tt.args.d)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("card() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			var gotJson any
+			err = json.Unmarshal(got, &gotJson)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			var wantJson any
+			err = json.Unmarshal(tt.want, &wantJson)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			//if !reflect.DeepEqual(wantJson, gotJson) {
+			//	t.Errorf("card() got = %v, want %v", gotJson, wantJson)
+			//}
+			if diff := cmp.Diff(wantJson, gotJson); diff != "" {
+				t.Errorf("MakeGatewayInfo() mismatch (-want +got):\n%s", diff)
+			}
+		})
+	}
+}