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feat: add Compare using go-cmp (#546)
* feat: add CompareEqual using go-cmp * fix: use recover to let it as usual error handling * refactor: rename Compare -> BeComparableTo
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package matchers | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "github.com/google/go-cmp/cmp" | ||
| "github.com/onsi/gomega/format" | ||
| ) | ||
|
|
||
| type BeComparableToMatcher struct { | ||
| Expected interface{} | ||
| Options cmp.Options | ||
| } | ||
|
|
||
| func (matcher *BeComparableToMatcher) Match(actual interface{}) (success bool, matchErr error) { | ||
| if actual == nil && matcher.Expected == nil { | ||
| return false, fmt.Errorf("Refusing to compare <nil> to <nil>.\nBe explicit and use BeNil() instead. This is to avoid mistakes where both sides of an assertion are erroneously uninitialized.") | ||
| } | ||
| // Shortcut for byte slices. | ||
| // Comparing long byte slices with reflect.DeepEqual is very slow, | ||
| // so use bytes.Equal if actual and expected are both byte slices. | ||
| if actualByteSlice, ok := actual.([]byte); ok { | ||
| if expectedByteSlice, ok := matcher.Expected.([]byte); ok { | ||
| return bytes.Equal(actualByteSlice, expectedByteSlice), nil | ||
| } | ||
| } | ||
|
|
||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| success = false | ||
| if err, ok := r.(error); ok { | ||
| matchErr = err | ||
| } else if errMsg, ok := r.(string); ok { | ||
| matchErr = fmt.Errorf(errMsg) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return cmp.Equal(actual, matcher.Expected, matcher.Options...), nil | ||
| } | ||
|
|
||
| func (matcher *BeComparableToMatcher) FailureMessage(actual interface{}) (message string) { | ||
| return cmp.Diff(matcher.Expected, actual) | ||
| } | ||
|
|
||
| func (matcher *BeComparableToMatcher) NegatedFailureMessage(actual interface{}) (message string) { | ||
| return format.Message(actual, "not to equal", matcher.Expected) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package matchers_test | ||
|
|
||
| import ( | ||
| "errors" | ||
| "github.com/google/go-cmp/cmp" | ||
| "github.com/google/go-cmp/cmp/cmpopts" | ||
| "time" | ||
|
|
||
| . "github.com/onsi/ginkgo/v2" | ||
| . "github.com/onsi/gomega" | ||
| . "github.com/onsi/gomega/matchers" | ||
| ) | ||
|
|
||
| type wrapError struct { | ||
| msg string | ||
| err error | ||
| } | ||
|
|
||
| func (e wrapError) Error() string { | ||
| return e.msg | ||
| } | ||
|
|
||
| func (e wrapError) Unwrap() error { | ||
| return e.err | ||
| } | ||
|
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||
| var _ = Describe("BeComparableTo", func() { | ||
| When("asserting that nil is comparable to nil", func() { | ||
| It("should error", func() { | ||
| success, err := (&BeComparableToMatcher{Expected: nil}).Match(nil) | ||
|
|
||
| Expect(success).Should(BeFalse()) | ||
| Expect(err).Should(HaveOccurred()) | ||
| }) | ||
| }) | ||
|
|
||
| Context("When asserting on nil", func() { | ||
| It("should do the right thing", func() { | ||
| Expect("foo").ShouldNot(BeComparableTo(nil)) | ||
| Expect(nil).ShouldNot(BeComparableTo(3)) | ||
| Expect([]int{1, 2}).ShouldNot(BeComparableTo(nil)) | ||
| }) | ||
| }) | ||
|
|
||
| Context("When asserting time with different location ", func() { | ||
| var t1, t2, t3 time.Time | ||
|
|
||
| BeforeEach(func() { | ||
| t1 = time.Time{} | ||
| t2 = time.Time{}.Local() | ||
| t3 = t1.Add(time.Second) | ||
| }) | ||
|
|
||
| It("should do the right thing", func() { | ||
| Expect(t1).Should(BeComparableTo(t2)) | ||
| Expect(t1).ShouldNot(BeComparableTo(t3)) | ||
| }) | ||
| }) | ||
|
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| Context("When struct contain unexported fields", func() { | ||
| type structWithUnexportedFields struct { | ||
| unexported string | ||
| Exported string | ||
| } | ||
|
|
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| var s1, s2 structWithUnexportedFields | ||
|
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| BeforeEach(func() { | ||
| s1 = structWithUnexportedFields{unexported: "unexported", Exported: "Exported"} | ||
| s2 = structWithUnexportedFields{unexported: "unexported", Exported: "Exported"} | ||
| }) | ||
|
|
||
| It("should get match err", func() { | ||
| success, err := (&BeComparableToMatcher{Expected: s1}).Match(s2) | ||
| Expect(success).Should(BeFalse()) | ||
| Expect(err).Should(HaveOccurred()) | ||
| }) | ||
|
|
||
| It("should do the right thing", func() { | ||
| Expect(s1).Should(BeComparableTo(s2, cmpopts.IgnoreUnexported(structWithUnexportedFields{}))) | ||
| }) | ||
| }) | ||
|
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||
| Context("When compare error", func() { | ||
| var err1, err2 error | ||
|
|
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| It("not equal", func() { | ||
| err1 = errors.New("error") | ||
| err2 = errors.New("error") | ||
| Expect(err1).ShouldNot(BeComparableTo(err2, cmpopts.EquateErrors())) | ||
| }) | ||
|
|
||
| It("equal if err1 is err2", func() { | ||
| err1 = errors.New("error") | ||
| err2 = &wrapError{ | ||
| msg: "some error", | ||
| err: err1, | ||
| } | ||
|
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| Expect(err1).Should(BeComparableTo(err2, cmpopts.EquateErrors())) | ||
| }) | ||
| }) | ||
|
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| Context("When asserting equal between objects", func() { | ||
| It("should do the right thing", func() { | ||
| Expect(5).Should(BeComparableTo(5)) | ||
| Expect(5.0).Should(BeComparableTo(5.0)) | ||
|
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| Expect(5).ShouldNot(BeComparableTo("5")) | ||
| Expect(5).ShouldNot(BeComparableTo(5.0)) | ||
| Expect(5).ShouldNot(BeComparableTo(3)) | ||
|
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||
| Expect("5").Should(BeComparableTo("5")) | ||
| Expect([]int{1, 2}).Should(BeComparableTo([]int{1, 2})) | ||
| Expect([]int{1, 2}).ShouldNot(BeComparableTo([]int{2, 1})) | ||
| Expect([]byte{'f', 'o', 'o'}).Should(BeComparableTo([]byte{'f', 'o', 'o'})) | ||
| Expect([]byte{'f', 'o', 'o'}).ShouldNot(BeComparableTo([]byte{'b', 'a', 'r'})) | ||
| Expect(map[string]string{"a": "b", "c": "d"}).Should(BeComparableTo(map[string]string{"a": "b", "c": "d"})) | ||
| Expect(map[string]string{"a": "b", "c": "d"}).ShouldNot(BeComparableTo(map[string]string{"a": "b", "c": "e"})) | ||
|
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| Expect(myCustomType{s: "abc", n: 3, f: 2.0, arr: []string{"a", "b"}}).Should(BeComparableTo(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}, cmpopts.IgnoreUnexported(myCustomType{}))) | ||
|
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| Expect(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}).Should(BeComparableTo(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}, cmp.AllowUnexported(myCustomType{}))) | ||
| Expect(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}).ShouldNot(BeComparableTo(myCustomType{s: "bar", n: 3, f: 2.0, arr: []string{"a", "b"}}, cmp.AllowUnexported(myCustomType{}))) | ||
| Expect(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}).ShouldNot(BeComparableTo(myCustomType{s: "foo", n: 2, f: 2.0, arr: []string{"a", "b"}}, cmp.AllowUnexported(myCustomType{}))) | ||
| Expect(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}).ShouldNot(BeComparableTo(myCustomType{s: "foo", n: 3, f: 3.0, arr: []string{"a", "b"}}, cmp.AllowUnexported(myCustomType{}))) | ||
| Expect(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b"}}).ShouldNot(BeComparableTo(myCustomType{s: "foo", n: 3, f: 2.0, arr: []string{"a", "b", "c"}}, cmp.AllowUnexported(myCustomType{}))) | ||
| }) | ||
| }) | ||
| }) |