type Foo struct {

Bar bool `json:"bar"`

}

src := Foo{Bar: true}

dst := Foo{Bar: false}

if err := mergo.Merge(&dst, src); err != nil {

t.Error(err)

}

if dst.Bar == false {

t.Errorf("expected true, got false")

}

p1 := map[string]interface{}{

"A": 3, "B": "note", "C": true,

}

p2 := map[string]interface{}{

"B": "", "C": false,

}

if err := mergo.Merge(&p1, p2, mergo.WithOverwriteWithEmptyValue); err != nil {

t.Error(err)

}

testCases := []struct {

expected interface{}

key string

}{

{

"",

"B",

},

{

false,

"C",

},

}

for _, tC := range testCases {

if p1[tC.key] != tC.expected {

t.Errorf("expected %v in p1[%q], got %v", tC.expected, tC.key, p1[tC.key])

}

}