3ce066a91a
The Blueprint struct is complex, deep, and full of references. This means that any changes to it in memory will persist. Sometimes you need an actual copy of it, so this adds DeepCopy which uses the json.Marshal and Unmarshal functions to create a deep copy with no references to the original. This is not very efficient, but the alternative is adding Copy functions to all the member structs and then calling them to build the copy.
38 lines
932 B
Go
38 lines
932 B
Go
package blueprint
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import (
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"github.com/google/go-cmp/cmp"
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"testing"
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)
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func TestDeepCopy(t *testing.T) {
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bpOrig := Blueprint{
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Name: "deepcopy-test",
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Description: "Testing DeepCopy function",
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Version: "0.0.1",
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Packages: []Package{
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{Name: "dep-package1", Version: "*"}},
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Modules: []Package{
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{Name: "dep-package2", Version: "*"}},
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}
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bpCopy, err := bpOrig.DeepCopy()
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if err != nil {
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t.Fatalf("Blueprint.DeepCopy failure: %s", err.Error())
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}
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if diff := cmp.Diff(bpOrig, bpCopy); diff != "" {
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t.Fatalf("Blueprint.DeepCopy is different from original\ndiff: %s", diff)
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}
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// Modify the copy
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bpCopy.Packages[0].Version = "1.2.3"
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if bpOrig.Packages[0].Version != "*" {
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t.Fatalf("Blueprint.DeepCopy failed, original modified")
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}
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// Modify the original
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bpOrig.Packages[0].Version = "42.0"
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if bpCopy.Packages[0].Version != "1.2.3" {
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t.Fatalf("Blueprint.DeepCopy failed, copy modified")
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}
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}
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