Added more tests and refactored exporter tests. Added code coverage badge.

export/json_test.go

@@ -1,16 +1,27 @@
 package export
 
-import "testing"
+import (
+	"github.com/stretchr/testify/assert"
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+)
 
 func TestJSONExporter_Export(t *testing.T) {
-	ch := make(chan interface{})
-	defer close(ch)
-
 	exporter := &JSON{
 		FileName: "out.json",
 		Indent:   " ",
 	}
-	go exporter.Export(ch)
+	_ = os.Remove(exporter.FileName)
+	exports := make(chan interface{})
+	go exporter.Export(exports)
 
-	ch <- map[string]string{"key": "value"}
+	exports <- map[string]string{"key": "value"}
+	close(exports)
+	time.Sleep(time.Millisecond)
+
+	contents, err := ioutil.ReadFile(exporter.FileName)
+	assert.NoError(t, err)
+	assert.Equal(t, "{\n \"key\": \"value\"\n}\n", string(contents))
 }