58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
package matchers_test
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import (
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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. "github.com/onsi/gomega/matchers"
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)
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var _ = Describe("NotMatcher", func() {
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Context("basic examples", func() {
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It("works", func() {
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Expect(input).To(Not(false1))
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Expect(input).To(Not(Not(true2)))
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Expect(input).ToNot(Not(true3))
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Expect(input).ToNot(Not(Not(false1)))
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Expect(input).To(Not(Not(Not(false2))))
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})
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})
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Context("De Morgan's laws", func() {
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It("~(A && B) == ~A || ~B", func() {
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Expect(input).To(Not(And(false1, false2)))
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Expect(input).To(Or(Not(false1), Not(false2)))
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})
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It("~(A || B) == ~A && ~B", func() {
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Expect(input).To(Not(Or(false1, false2)))
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Expect(input).To(And(Not(false1), Not(false2)))
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})
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})
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Context("failure messages are opposite of original matchers' failure messages", func() {
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Context("when match fails", func() {
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It("gives a descriptive message", func() {
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verifyFailureMessage(Not(HaveLen(2)), input, "not to have length 2")
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})
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})
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Context("when match succeeds, but expected it to fail", func() {
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It("gives a descriptive message", func() {
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verifyFailureMessage(Not(Not(HaveLen(3))), input, "to have length 3")
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})
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})
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})
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Context("MatchMayChangeInTheFuture()", func() {
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It("Propagates value from wrapped matcher", func() {
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m := Not(Or()) // an empty Or() always returns false, and indicates it cannot change
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Expect(m.Match("anything")).To(BeTrue())
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Expect(m.(*NotMatcher).MatchMayChangeInTheFuture("anything")).To(BeFalse())
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})
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It("Defaults to true", func() {
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m := Not(Equal(1)) // Equal does not have this method
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Expect(m.Match(2)).To(BeTrue())
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Expect(m.(*NotMatcher).MatchMayChangeInTheFuture(2)).To(BeTrue()) // defaults to true
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})
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})
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})
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