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

SourceAnalysisAndTool/mergo@v0.3.11/issue138_test.go

@@ -0,0 +1,42 @@
+package mergo_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/imdario/mergo"
+)
+
+const issue138configuration string = `
+{
+	"Port": 80
+}
+`
+
+func TestIssue138(t *testing.T) {
+	type config struct {
+		Port uint16
+	}
+	type compatibleConfig struct {
+		Port float64
+	}
+
+	foo := make(map[string]interface{})
+	// encoding/json unmarshals numbers as float64
+	// https://golang.org/pkg/encoding/json/#Unmarshal
+	json.Unmarshal([]byte(issue138configuration), &foo)
+
+	err := mergo.Map(&config{}, foo)
+	if err == nil {
+		t.Error("expected type mismatch error, got nil")
+	} else {
+		if err.Error() != "type mismatch on Port field: found float64, expected uint16" {
+			t.Errorf("expected type mismatch error, got %q", err)
+		}
+	}
+
+	c := compatibleConfig{}
+	if err := mergo.Map(&c, foo); err != nil {
+		t.Error(err)
+	}
+}