improve test coverage

cmd/squealer/main.go

@@ -55,17 +55,17 @@ func startSquealing(_ *cobra.Command, args []string) {
 	}
 	metrics := scanner.GetMetrics()
 	if !concise {
-		printMetrics(metrics)
+		fmt.Println(printMetrics(metrics))
 	}
 	if metrics.TransgressionsReported > 0 {
 		os.Exit(1)
 	}
 	os.Exit(0)
 }
 
-func printMetrics(metrics *mertics.Metrics) {
+func printMetrics(metrics *mertics.Metrics) string {
 	duration, _ := metrics.Duration()
-	fmt.Printf(`
+	return fmt.Sprintf(`
 Processing:
   duration:     %4.2fs
   commits:      %d

cmd/squealer/main_test.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/owenrumney/squealer/internal/app/squealer/mertics"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPrintMetrics(t *testing.T) {
+	m := mertics.Metrics{
+		CommitsProcessed:       1,
+		FilesProcessed:         2,
+		TransgressionsFound:    3,
+		TransgressionsIgnored:  4,
+		TransgressionsReported: 5,
+	}
+	m.StartTimer()
+	m.StopTimer()
+
+	output := printMetrics(&m)
+	assert.Equal(t, `
+Processing:
+  duration:     0.00s
+  commits:      1
+  commit files: 2
+
+transgressionMap:
+  identified:   3
+  ignored:      4
+  reported:     5
+
+`, output)
+}