add calculate and merge coverage files

internal/analyzer/coverage/coverage_test.go

@@ -0,0 +1,36 @@
+package coverage
+
+import (
+	"context"
+	"git.unistack.org/unistack-org/pkgdash/internal/models"
+	"github.com/stretchr/testify/assert"
+	"os"
+	"testing"
+)
+
+func Test_Calculate(t *testing.T) {
+	file, err := os.Open("cover_test.out")
+	assert.Nil(t, err)
+	defer func() {
+		assert.Nil(t, file.Close())
+	}()
+
+	dataFiles, err := calculateFiles(file)
+	assert.Nil(t, err)
+	assert.NotNil(t, dataFiles)
+}
+
+func Test_Analyze(t *testing.T) {
+	file, err := os.Open("cover_test.out")
+	assert.Nil(t, err)
+	defer func() {
+		assert.Nil(t, file.Close())
+	}()
+
+	analyze, err := Analyze(context.Background(), file, models.Package{
+		Name: "go.unistack.org/micro/v4",
+		URL:  "https://git.unistack.org/unistack-org/micro.git",
+	})
+	assert.Nil(t, err)
+	assert.Equal(t, analyze, 0.0)
+}