diff options
Diffstat (limited to 'vendor/github.com/onsi/gomega/matchers/with_transform_test.go')
-rw-r--r-- | vendor/github.com/onsi/gomega/matchers/with_transform_test.go | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/vendor/github.com/onsi/gomega/matchers/with_transform_test.go b/vendor/github.com/onsi/gomega/matchers/with_transform_test.go new file mode 100644 index 000000000..e52bf8e63 --- /dev/null +++ b/vendor/github.com/onsi/gomega/matchers/with_transform_test.go @@ -0,0 +1,102 @@ +package matchers_test + +import ( + "errors" + + . "github.com/onsi/ginkgo" + . "github.com/onsi/gomega" + . "github.com/onsi/gomega/matchers" +) + +var _ = Describe("WithTransformMatcher", func() { + + var plus1 = func(i int) int { return i + 1 } + + Context("Panic if transform function invalid", func() { + panicsWithTransformer := func(transform interface{}) { + ExpectWithOffset(1, func() { WithTransform(transform, nil) }).To(Panic()) + } + It("nil", func() { + panicsWithTransformer(nil) + }) + Context("Invalid number of args, but correct return value count", func() { + It("zero", func() { + panicsWithTransformer(func() int { return 5 }) + }) + It("two", func() { + panicsWithTransformer(func(i, j int) int { return 5 }) + }) + }) + Context("Invalid number of return values, but correct number of arguments", func() { + It("zero", func() { + panicsWithTransformer(func(i int) {}) + }) + It("two", func() { + panicsWithTransformer(func(i int) (int, int) { return 5, 6 }) + }) + }) + }) + + It("works with positive cases", func() { + Expect(1).To(WithTransform(plus1, Equal(2))) + Expect(1).To(WithTransform(plus1, WithTransform(plus1, Equal(3)))) + Expect(1).To(WithTransform(plus1, And(Equal(2), BeNumerically(">", 1)))) + + // transform expects custom type + type S struct { + A int + B string + } + transformer := func(s S) string { return s.B } + Expect(S{1, "hi"}).To(WithTransform(transformer, Equal("hi"))) + + // transform expects interface + errString := func(e error) string { return e.Error() } + Expect(errors.New("abc")).To(WithTransform(errString, Equal("abc"))) + }) + + It("works with negative cases", func() { + Expect(1).ToNot(WithTransform(plus1, Equal(3))) + Expect(1).ToNot(WithTransform(plus1, WithTransform(plus1, Equal(2)))) + }) + + Context("failure messages", func() { + Context("when match fails", func() { + It("gives a descriptive message", func() { + m := WithTransform(plus1, Equal(3)) + Expect(m.Match(1)).To(BeFalse()) + Expect(m.FailureMessage(1)).To(Equal("Expected\n <int>: 2\nto equal\n <int>: 3")) + }) + }) + + Context("when match succeeds, but expected it to fail", func() { + It("gives a descriptive message", func() { + m := Not(WithTransform(plus1, Equal(3))) + Expect(m.Match(2)).To(BeFalse()) + Expect(m.FailureMessage(2)).To(Equal("Expected\n <int>: 3\nnot to equal\n <int>: 3")) + }) + }) + + Context("actual value is incompatible with transform function's argument type", func() { + It("gracefully fails if transform cannot be performed", func() { + m := WithTransform(plus1, Equal(3)) + result, err := m.Match("hi") // give it a string but transform expects int; doesn't panic + Expect(result).To(BeFalse()) + Expect(err).To(MatchError("Transform function expects 'int' but we have 'string'")) + }) + }) + }) + + Context("MatchMayChangeInTheFuture()", func() { + It("Propagates value from wrapped matcher on the transformed value", func() { + m := WithTransform(plus1, Or()) // empty Or() always returns false, and indicates it cannot change + Expect(m.Match(1)).To(BeFalse()) + Expect(m.(*WithTransformMatcher).MatchMayChangeInTheFuture(1)).To(BeFalse()) // empty Or() indicates cannot change + }) + It("Defaults to true", func() { + m := WithTransform(plus1, Equal(2)) // Equal does not have this method + Expect(m.Match(1)).To(BeTrue()) + Expect(m.(*WithTransformMatcher).MatchMayChangeInTheFuture(1)).To(BeTrue()) // defaults to true + }) + }) +}) |