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package matchers_test
import (
"errors"
"fmt"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
. "github.com/onsi/gomega/matchers"
)
type CustomError struct {
}
func (c CustomError) Error() string {
return "an error"
}
var _ = Describe("MatchErrorMatcher", func() {
Context("When asserting against an error", func() {
It("should succeed when matching with an error", func() {
err := errors.New("an error")
fmtErr := fmt.Errorf("an error")
customErr := CustomError{}
Expect(err).Should(MatchError(errors.New("an error")))
Expect(err).ShouldNot(MatchError(errors.New("another error")))
Expect(fmtErr).Should(MatchError(errors.New("an error")))
Expect(customErr).Should(MatchError(CustomError{}))
})
It("should succeed when matching with a string", func() {
err := errors.New("an error")
fmtErr := fmt.Errorf("an error")
customErr := CustomError{}
Expect(err).Should(MatchError("an error"))
Expect(err).ShouldNot(MatchError("another error"))
Expect(fmtErr).Should(MatchError("an error"))
Expect(customErr).Should(MatchError("an error"))
})
Context("when passed a matcher", func() {
It("should pass if the matcher passes against the error string", func() {
err := errors.New("error 123 abc")
Expect(err).Should(MatchError(MatchRegexp(`\d{3}`)))
})
It("should fail if the matcher fails against the error string", func() {
err := errors.New("no digits")
Expect(err).ShouldNot(MatchError(MatchRegexp(`\d`)))
})
})
It("should fail when passed anything else", func() {
actualErr := errors.New("an error")
_, err := (&MatchErrorMatcher{
Expected: []byte("an error"),
}).Match(actualErr)
Expect(err).Should(HaveOccurred())
_, err = (&MatchErrorMatcher{
Expected: 3,
}).Match(actualErr)
Expect(err).Should(HaveOccurred())
})
})
Context("when passed nil", func() {
It("should fail", func() {
_, err := (&MatchErrorMatcher{
Expected: "an error",
}).Match(nil)
Expect(err).Should(HaveOccurred())
})
})
Context("when passed a non-error", func() {
It("should fail", func() {
_, err := (&MatchErrorMatcher{
Expected: "an error",
}).Match("an error")
Expect(err).Should(HaveOccurred())
_, err = (&MatchErrorMatcher{
Expected: "an error",
}).Match(3)
Expect(err).Should(HaveOccurred())
})
})
Context("when passed an error that is also a string", func() {
It("should use it as an error", func() {
var e mockErr = "mockErr"
// this fails if the matcher casts e to a string before comparison
Expect(e).Should(MatchError(e))
})
})
})
type mockErr string
func (m mockErr) Error() string { return string(m) }
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