52 lines
1.7 KiB
Markdown
52 lines
1.7 KiB
Markdown
# Deep Variable Equality for Humans
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[](https://goreportcard.com/report/github.com/go-test/deep) [](https://travis-ci.org/go-test/deep) [](https://coveralls.io/github/go-test/deep?branch=master) [](https://godoc.org/github.com/go-test/deep)
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This package provides a single function: `deep.Equal`. It's like [reflect.DeepEqual](http://golang.org/pkg/reflect/#DeepEqual) but much friendlier to humans (or any sentient being) for two reason:
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* `deep.Equal` returns a list of differences
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* `deep.Equal` does not compare unexported fields (by default)
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`reflect.DeepEqual` is good (like all things Golang!), but it's a game of [Hunt the Wumpus](https://en.wikipedia.org/wiki/Hunt_the_Wumpus). For large maps, slices, and structs, finding the difference is difficult.
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`deep.Equal` doesn't play games with you, it lists the differences:
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```go
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package main_test
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import (
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"testing"
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"github.com/go-test/deep"
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)
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type T struct {
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Name string
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Numbers []float64
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}
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func TestDeepEqual(t *testing.T) {
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// Can you spot the difference?
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t1 := T{
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Name: "Isabella",
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Numbers: []float64{1.13459, 2.29343, 3.010100010},
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}
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t2 := T{
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Name: "Isabella",
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Numbers: []float64{1.13459, 2.29843, 3.010100010},
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}
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if diff := deep.Equal(t1, t2); diff != nil {
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t.Error(diff)
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}
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}
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```
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```
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$ go test
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--- FAIL: TestDeepEqual (0.00s)
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main_test.go:25: [Numbers.slice[1]: 2.29343 != 2.29843]
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```
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The difference is in `Numbers.slice[1]`: the two values aren't equal using Go `==`.
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