feat(Go-StudyExample):2021/02/09:新增merge源码阅读和单测代码

SourceAnalysisAndTool/mergo@v0.3.11/issue23_test.go

@@ -0,0 +1,31 @@
+package mergo_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/imdario/mergo"
+)
+
+type document struct {
+	Created *time.Time
+}
+
+func TestIssue23MergeWithOverwrite(t *testing.T) {
+	now := time.Now()
+	dst := document{
+		&now,
+	}
+	expected := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
+	src := document{
+		&expected,
+	}
+
+	if err := mergo.MergeWithOverwrite(&dst, src); err != nil {
+		t.Errorf("Error while merging %s", err)
+	}
+
+	if !dst.Created.Equal(*src.Created) { //--> https://golang.org/pkg/time/#pkg-overview
+		t.Errorf("Created not merged in properly: dst.Created(%v) != src.Created(%v)", dst.Created, src.Created)
+	}
+}