github.com/onsi/gomega@v1.32.0/matchers/have_prefix_matcher_test.go (about)

     1  package matchers_test
     2  
     3  import (
     4  	. "github.com/onsi/ginkgo/v2"
     5  	. "github.com/onsi/gomega"
     6  	. "github.com/onsi/gomega/matchers"
     7  )
     8  
     9  var _ = Describe("HavePrefixMatcher", func() {
    10  	When("actual is a string", func() {
    11  		It("should match a string prefix", func() {
    12  			Expect("Ab").Should(HavePrefix("A"))
    13  			Expect("A").ShouldNot(HavePrefix("Ab"))
    14  		})
    15  	})
    16  
    17  	When("the matcher is called with multiple arguments", func() {
    18  		It("should pass the string and arguments to sprintf", func() {
    19  			Expect("C3PO").Should(HavePrefix("C%dP", 3))
    20  		})
    21  	})
    22  
    23  	When("actual is a stringer", func() {
    24  		It("should call the stringer and match against the returned string", func() {
    25  			Expect(&myStringer{a: "Ab"}).Should(HavePrefix("A"))
    26  		})
    27  	})
    28  
    29  	When("actual is neither a string nor a stringer", func() {
    30  		It("should error", func() {
    31  			success, err := (&HavePrefixMatcher{Prefix: "2"}).Match(2)
    32  			Expect(success).Should(BeFalse())
    33  			Expect(err).Should(HaveOccurred())
    34  		})
    35  	})
    36  
    37  	It("shows failure message", func() {
    38  		failuresMessages := InterceptGomegaFailures(func() {
    39  			Expect("foo").To(HavePrefix("bar"))
    40  		})
    41  		Expect(failuresMessages[0]).To(Equal("Expected\n    <string>: foo\nto have prefix\n    <string>: bar"))
    42  	})
    43  
    44  	It("shows negated failure message", func() {
    45  		failuresMessages := InterceptGomegaFailures(func() {
    46  			Expect("foo").ToNot(HavePrefix("fo"))
    47  		})
    48  		Expect(failuresMessages[0]).To(Equal("Expected\n    <string>: foo\nnot to have prefix\n    <string>: fo"))
    49  	})
    50  })