Nicolas Lenepveu
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package optional
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import (
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"encoding/json"
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"testing"
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)
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func TestOptionalInt_UnmarshalJSON(t *testing.T) {
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type payload struct {
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Cap Int `json:"cap"`
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}
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t.Run("absent key leaves Present false", func(t *testing.T) {
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var p payload
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if err := json.Unmarshal([]byte(`{"other":1}`), &p); err != nil {
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t.Fatalf("unmarshal: %v", err)
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}
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if p.Cap.Present {
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t.Fatalf("expected Present=false for absent key, got Present=true")
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}
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if p.Cap.Value != nil {
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t.Fatalf("expected nil Value for absent key, got %v", *p.Cap.Value)
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}
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})
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t.Run("explicit null is present with nil value", func(t *testing.T) {
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var p payload
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if err := json.Unmarshal([]byte(`{"cap":null}`), &p); err != nil {
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t.Fatalf("unmarshal: %v", err)
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}
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if !p.Cap.Present {
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t.Fatalf("expected Present=true for explicit null")
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}
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if p.Cap.Value != nil {
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t.Fatalf("expected nil Value for null, got %v", *p.Cap.Value)
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}
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})
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t.Run("number is present with that value", func(t *testing.T) {
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var p payload
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if err := json.Unmarshal([]byte(`{"cap":7}`), &p); err != nil {
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t.Fatalf("unmarshal: %v", err)
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}
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if !p.Cap.Present || p.Cap.Value == nil || *p.Cap.Value != 7 {
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t.Fatalf("expected Present=true Value=7, got Present=%v Value=%v", p.Cap.Present, p.Cap.Value)
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}
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})
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t.Run("non-integer is an error", func(t *testing.T) {
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var p payload
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if err := json.Unmarshal([]byte(`{"cap":"nope"}`), &p); err == nil {
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t.Fatalf("expected error for non-integer cap")
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}
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})
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}
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