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

SourceAnalysisAndTool/mergo@v0.3.11/issue84_test.go

@@ -0,0 +1,90 @@
+package mergo_test
+
+import (
+	"testing"
+
+	"github.com/imdario/mergo"
+)
+
+type DstStructIssue84 struct {
+	A int
+	B int
+	C int
+}
+
+type DstNestedStructIssue84 struct {
+	A struct {
+		A int
+		B int
+		C int
+	}
+	B int
+	C int
+}
+
+func TestIssue84MergeMapWithNilValueToStructWithOverride(t *testing.T) {
+	p1 := DstStructIssue84{
+		A: 0, B: 1, C: 2,
+	}
+	p2 := map[string]interface{}{
+		"A": 3, "B": 4, "C": 0,
+	}
+
+	if err := mergo.Map(&p1, p2, mergo.WithOverride); err != nil {
+		t.Errorf("Error during the merge: %v", err)
+	}
+
+	if p1.C != 0 {
+		t.Error("C field should become '0'")
+	}
+}
+
+func TestIssue84MergeMapWithoutKeyExistsToStructWithOverride(t *testing.T) {
+	p1 := DstStructIssue84{
+		A: 0, B: 1, C: 2,
+	}
+	p2 := map[string]interface{}{
+		"A": 3, "B": 4,
+	}
+
+	if err := mergo.Map(&p1, p2, mergo.WithOverride); err != nil {
+		t.Errorf("Error during the merge: %v", err)
+	}
+
+	if p1.C != 2 {
+		t.Error("C field should be '2'")
+	}
+}
+
+func TestIssue84MergeNestedMapWithNilValueToStructWithOverride(t *testing.T) {
+	p1 := DstNestedStructIssue84{
+		A: struct {
+			A int
+			B int
+			C int
+		}{A: 1, B: 2, C: 0},
+		B: 0,
+		C: 2,
+	}
+	p2 := map[string]interface{}{
+		"A": map[string]interface{}{
+			"A": 0, "B": 0, "C": 5,
+		}, "B": 4, "C": 0,
+	}
+
+	if err := mergo.Map(&p1, p2, mergo.WithOverride); err != nil {
+		t.Errorf("Error during the merge: %v", err)
+	}
+
+	if p1.B != 4 {
+		t.Error("A.C field should become '4'")
+	}
+
+	if p1.A.C != 5 {
+		t.Error("A.C field should become '5'")
+	}
+
+	if p1.A.B != 0 || p1.A.A != 0 {
+		t.Error("A.A and A.B field should become '0'")
+	}
+}