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interaction_test.go
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interaction_test.go
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package moka
import (
"errors"
"fmt"
"reflect"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("interaction", func() {
Describe("argsInteraction", func() {
var interaction interaction
Describe("call", func() {
var matched bool
var returnValues []interface{}
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{42, nil},
)
})
Context("when both the method name and the args match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("UltimateQuestion", []interface{}{"life", "universe", "everything"})
})
It("matches and returns its return values", func() {
Expect(returnValues).To(Equal([]interface{}{42, nil}))
Expect(matched).To(BeTrue())
})
})
Context("when the method name doesn't match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("DomandaFondamentale", []interface{}{"life", "universe", "everything"})
})
It("doesn't match and returns nil", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(BeFalse())
})
})
Context("when the arguments don't match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("UltimateQuestion", []interface{}{"vita", "universo", "tutto quanto"})
})
It("doesn't match and returns nil", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(BeFalse())
})
})
Context("when both method name and the arguments don't match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("DomandaFondamentale", []interface{}{"vita", "universo", "tutto quanto"})
})
It("doesn't match and returns nil", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(BeFalse())
})
})
})
Describe("verify", func() {
BeforeEach(func() {
interaction = newArgsInteraction("", nil, nil)
})
It("does nothing and always returns nil", func() {
Expect(interaction.verify()).To(BeNil())
})
})
Describe("checkType", func() {
var TestCheckType = func(t reflect.Type) {
var checkTypeError error
JustBeforeEach(func() {
checkTypeError = interaction.checkType(t)
})
Context("when the method is defined and all types match", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{42, nil},
)
})
It("succeeds", func() {
Expect(checkTypeError).NotTo(HaveOccurred())
})
})
Context("when the method is not defined", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"WorstQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{42, nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type '%s' has no method 'WorstQuestion'", t.Name())))
})
})
Context("when the number of arguments doesn't match", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe"},
[]interface{}{42, nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: method '%s.UltimateQuestion' takes 3 arguments, 2 specified", t.Name())))
})
})
Context("when the type of some arguments doesn't match", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", 0},
[]interface{}{42, nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of argument 3 of method '%s.UltimateQuestion' is 'string', 'int' given", t.Name())))
})
})
Context("when nil is specified for a non-nillable type argument", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", nil},
[]interface{}{42, nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of argument 3 of method '%s.UltimateQuestion' is 'string', 'nil' given", t.Name())))
})
})
Context("when nil is specified for a nillable type argument", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestionWithSlice",
[]interface{}{nil},
[]interface{}{42, nil},
)
})
It("succeeds", func() {
Expect(checkTypeError).NotTo(HaveOccurred())
})
})
Context("when the number of return values doesn't match", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{42},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: method '%s.UltimateQuestion' returns 2 values, 1 specified", t.Name())))
})
})
Context("when the type of return values don't match", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{"forty-two", nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of return value 1 of method '%s.UltimateQuestion' is 'int', 'string' given", t.Name())))
})
})
Context("when nil is specified for a non-nillable type return value", func() {
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
[]interface{}{"life", "universe", "everything"},
[]interface{}{nil, nil},
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of return value 1 of method '%s.UltimateQuestion' is 'int', 'nil' given", t.Name())))
})
})
}
TestCheckType(reflect.TypeOf((*deepThought)(nil)).Elem())
TestCheckType(reflect.TypeOf(myDeepThought{}))
})
Context("when no arguments are specified", func() {
var matched bool
var returnValues []interface{}
var checkTypeError error
BeforeEach(func() {
interaction = newArgsInteraction(
"UltimateQuestion",
nil,
[]interface{}{42, nil},
)
})
Describe("call", func() {
Context("when the method name matches", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("UltimateQuestion", []interface{}{"anything"})
})
It("matches and returns its return values", func() {
Expect(returnValues).To(Equal([]interface{}{42, nil}))
Expect(matched).To(BeTrue())
})
})
Context("when the method name doesn't match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("DomandaFondamentale", []interface{}{"anything"})
})
It("doesn't match and returns nil", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(BeFalse())
})
})
})
Describe("checkType", func() {
JustBeforeEach(func() {
checkTypeError = interaction.checkType(reflect.TypeOf(myDeepThought{}))
})
Context("when the method is defined", func() {
It("succeeds", func() {
Expect(checkTypeError).NotTo(HaveOccurred())
})
})
})
})
})
Describe("expectedInteraction", func() {
var expectedMethodName = "UltimateQuestion"
var expectedArgs = []interface{}{"life", "universe", "everything"}
var returnValues []interface{}
var matched bool
var fakeInteraction *fakeInteraction
var expectedInteraction interaction
JustBeforeEach(func() {
expectedInteraction = newExpectedInteraction(fakeInteraction)
returnValues, matched = expectedInteraction.call(expectedMethodName, expectedArgs)
})
Context("when called with the expected method name and args", func() {
BeforeEach(func() {
fakeInteraction = newFakeInteraction([]interface{}{42, nil}, true, nil, nil)
})
It("delegates to the wrapped interaction and records the call for verification", func() {
Expect(returnValues).To(Equal([]interface{}{42, nil}))
Expect(matched).To(Equal(true))
Expect(expectedInteraction.verify()).To(BeNil())
})
})
Context("when called with unexpected method names or args", func() {
BeforeEach(func() {
fakeInteraction = newFakeInteraction(nil, false, nil, nil)
})
It("delegates to the wrapped interaction but doesn't record the call for verification", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(Equal(false))
Expect(expectedInteraction.verify()).To(MatchError("Expected interaction: <the-interaction-string-representation>"))
})
})
})
Describe("bodyInteraction", func() {
var interaction interaction
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo, topicThree string) (int, error) {
if topicOne == "life" && topicTwo == "universe" && topicThree == "everything" {
return 42, nil
}
return 0, errors.New("NOPE")
},
)
})
Describe("call", func() {
var matched bool
var returnValues []interface{}
Context("when the method name matches", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("UltimateQuestion", []interface{}{"life", "universe", "everything"})
})
It("matches and returns the return values from the body", func() {
Expect(returnValues).To(Equal([]interface{}{42, nil}))
Expect(matched).To(BeTrue())
})
})
Context("when the method name doesn't match", func() {
JustBeforeEach(func() {
returnValues, matched = interaction.call("DomandaFondamentale", []interface{}{"life", "universe", "everything"})
})
It("matches and returns the return values from the body", func() {
Expect(returnValues).To(BeNil())
Expect(matched).To(BeFalse())
})
})
})
Describe("verify", func() {
It("does nothing and returns nil", func() {
Expect(interaction.verify()).To(BeNil())
})
})
Describe("checkType", func() {
var TestCheckType = func(t reflect.Type) {
var checkTypeError error
JustBeforeEach(func() {
checkTypeError = interaction.checkType(t)
})
Context("when the method is defined and all types match", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo, topicThree string) (int, error) { return 0, nil },
)
})
It("succeeds", func() {
Expect(checkTypeError).NotTo(HaveOccurred())
})
})
Context("when the method is not defined", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"WorstQuestion",
func(topicOne, topicTwo, topicThree string) (int, error) { return 0, nil },
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type '%s' has no method 'WorstQuestion'", t.Name())))
})
})
Context("when the number of arguments doesn't match", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo string) (int, error) { return 0, nil },
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: method '%s.UltimateQuestion' takes 3 arguments, provided func takes 2", t.Name())))
})
})
Context("when the argument types don't match", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo string, x interface{}) (int, error) { return 0, nil },
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of argument 3 of method '%s.UltimateQuestion' is 'string', type of argument 3 of provided func is 'interface {}'", t.Name())))
})
})
Context("when the number of return values doesn't match", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo, topicThree string) int { return 0 },
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: method '%s.UltimateQuestion' returns 2 values, provided func returns 1", t.Name())))
})
})
Context("when the return value types don't match", func() {
BeforeEach(func() {
interaction = newBodyInteraction(
"UltimateQuestion",
func(topicOne, topicTwo, topicThree string) (string, error) { return "", nil },
)
})
It("fails", func() {
Expect(checkTypeError).To(MatchError(fmt.Sprintf("Invalid interaction: type of return value 1 of method '%s.UltimateQuestion' is 'int', type of return value 1 of provided func is 'string'", t.Name())))
})
})
}
TestCheckType(reflect.TypeOf((*deepThought)(nil)).Elem())
TestCheckType(reflect.TypeOf(myDeepThought{}))
})
})
})
type deepThought interface {
UltimateQuestion(topicOne, topicTwo, topicThree string) (int, error)
UltimateQuestionWithSlice(things []string) (int, error)
}
type myDeepThought struct{}
func (dt myDeepThought) UltimateQuestion(topicOne, topicTwo, topicThree string) (int, error) {
return 42, nil
}
func (dt myDeepThought) UltimateQuestionWithSlice(things []string) (int, error) {
return 42, nil
}