diff --git a/lib/chatops/teams.go b/lib/chatops/teams.go
index 8b249c3..7e02c5a 100644
--- a/lib/chatops/teams.go
+++ b/lib/chatops/teams.go
@@ -55,7 +55,7 @@ func (c *ChatOps) teams(code int, target string, output interface{}) (*adaptivec
 
 	// Change texts and add details button, depending on type of output (error, QueueItem, any)
 	switch fmt.Sprintf("%T", output) {
-	case "error":
+	case "*errors.errorString":
 		messageTextBlock = NewTextBlock(fmt.Sprintf("Error: %s", output), color)
 		details = false
 	case "*queue.QueueItem":
@@ -132,6 +132,7 @@ func ScanforWarn(output interface{}) bool {
 func getCaller() string {
 	var callerFunction string
 
+	// ignoring return values 'file name' and 'line number in that file', because those values are not needed
 	pc, _, _, ok := runtime.Caller(3)
 	runtimedetails := runtime.FuncForPC(pc)
 	if ok && runtimedetails != nil {
diff --git a/lib/chatops/teams_test.go b/lib/chatops/teams_test.go
new file mode 100644
index 0000000..39038dc
--- /dev/null
+++ b/lib/chatops/teams_test.go
@@ -0,0 +1,116 @@
+package chatops
+
+import (
+	"encoding/json"
+	"fmt"
+	"testing"
+
+	"github.com/atc0005/go-teams-notify/v2/adaptivecard"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTeams(t *testing.T) {
+	t.Run("Teams Message Post", func(t *testing.T) {
+		serverURI := "https://example.webhook.office.com/webhook/xxx"
+		c := ChatOps{
+			Service:   "teams",
+			TestMode:  true,
+			ServerURI: &serverURI,
+		}
+
+		t.Run("Good module", func(t *testing.T) {
+			// test a successful message
+			msg, err := c.teams(202, "good_module", "things went well")
+
+			// Prepare message payload
+			msg.Prepare()
+
+			var data adaptivecard.Message
+			json.Unmarshal([]byte(msg.PrettyPrint()), &data)
+
+			assert.NoError(t, err, "should not error")
+
+			// assert header text
+			// two spaces in the text "Deploy  good_module", because calling function can't be determined
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Text, "Deploy  good_module", `header should be "Deploy  good_module"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Color, "good", `header color should be "good"`)
+
+			// assert body text
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Text, "Deployment of good_module successful", `body text should be "Deployment of good_module successful"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Color, "good", `body color should be "good"`)
+
+			// assert details text
+			assert.Equal(t, data.Attachments[0].Content.Body[2].Text, "r10k output:\n\nthings went well", `details text should be "r10k output:\n\nthings went well"`)
+		})
+		t.Run("Failed module", func(t *testing.T) {
+			// test a fail message
+			msg, err := c.teams(500, "fail_module", "something failed")
+
+			// Prepare message payload
+			msg.Prepare()
+
+			var data adaptivecard.Message
+			json.Unmarshal([]byte(msg.PrettyPrint()), &data)
+			// log.Print(msg.PrettyPrint())
+			// log.Print(data.Attachments[0].Content.Body[0].Text)
+
+			assert.NoError(t, err, "should not error")
+
+			// assert header text
+			// two spaces in the text "Deploy  fail_module", because calling function can't be determined
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Text, "Deploy  fail_module", `header should be "Deploy  fail_module"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Color, "attention", `header color should be "attention"`)
+
+			// assert body text
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Text, "Deployment of fail_module failed", `body text should be "Deployment of fail_module failed"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Color, "attention", `body color should be "attention"`)
+
+			// assert details text
+			assert.Equal(t, data.Attachments[0].Content.Body[2].Text, "r10k output:\n\nsomething failed", `details text should be "r10k output:\n\nsomething failed"`)
+		})
+		t.Run("Module with warnings", func(t *testing.T) {
+			// test a message with warning
+			msg, err := c.teams(202, "warn_module", "WARN -> there are warnings")
+
+			// Prepare message payload
+			msg.Prepare()
+
+			var data adaptivecard.Message
+			json.Unmarshal([]byte(msg.PrettyPrint()), &data)
+			// log.Print(msg.PrettyPrint())
+			// log.Print(data.Attachments[0].Content.Body[0].Text)
+
+			assert.NoError(t, err, "should not error")
+
+			// assert header text
+			// two spaces in the text "Deploy  warn_module", because calling function can't be determined
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Text, "Deploy  warn_module", `header should be "Deploy  warn_module"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Color, "warning", `header color should be "attention"`)
+
+			// assert body text
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Text, "Deployment of warn_module successful with Warnings", `body text should be "Deployment of warn_module successful with Warnings"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Color, "warning", `body color should be "attention"`)
+
+			// assert details text
+			assert.Equal(t, data.Attachments[0].Content.Body[2].Text, "r10k output:\n\nWARN -> there are warnings", `details text should be "r10k output:\n\nWARN -> there are warnings"`)
+		})
+		t.Run("Error", func(t *testing.T) {
+			// test an error state
+			msg, err := c.teams(500, "error_module", fmt.Errorf("an error occurred"))
+
+			// Prepare message payload
+			msg.Prepare()
+
+			var data adaptivecard.Message
+			json.Unmarshal([]byte(msg.PrettyPrint()), &data)
+
+			assert.NoError(t, err, "should not error")
+
+			// assert header text
+			// two spaces in the text "Deploy  warn_module", because calling function can't be determined
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Text, "Deploy  error_module", `header should be "Deploy  error_module"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[0].Color, "attention", `header color should be "attention"`)
+			assert.Equal(t, data.Attachments[0].Content.Body[1].Text, "Error: an error occurred", `body should be "Error: an error occurred"`)
+		})
+	})
+}