36 lines
879 B
Go
36 lines
879 B
Go
package mergo_test
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import (
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"reflect"
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"testing"
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"git.ct129.com/cmesh/mergo"
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)
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func TestMergeWithTransformerZeroValue(t *testing.T) {
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// This test specifically tests that a transformer can be used to
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// prevent overwriting a zero value (in this case a bool). This would fail prior to #211
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type fooWithBoolPtr struct {
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b *bool
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}
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var Bool = func(b bool) *bool { return &b }
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a := fooWithBoolPtr{b: Bool(false)}
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b := fooWithBoolPtr{b: Bool(true)}
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if err := mergo.Merge(&a, &b, mergo.WithTransformers(&transformer{
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m: map[reflect.Type]func(dst, src reflect.Value) error{
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reflect.TypeOf(Bool(false)): func(dst, src reflect.Value) error {
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if dst.CanSet() && dst.IsNil() {
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dst.Set(src)
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}
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return nil
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},
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},
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})); err != nil {
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t.Error(err)
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}
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if *a.b != false {
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t.Errorf("b not merged in properly: a.b(%v) != expected(%v)", a.b, false)
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}
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}
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