null_int_test.go

package types_test

import (
	. "code.cloudfoundry.org/cli/types"
	"github.com/jessevdk/go-flags"
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/ginkgo/extensions/table"
	. "github.com/onsi/gomega"
)

var _ = Describe("NullInt", func() {
	var nullInt NullInt

	BeforeEach(func() {
		nullInt = NullInt{
			IsSet: true,
			Value: 0xBAD,
		}
	})

	Describe("IsValidValue", func() {
		var (
			input      string
			executeErr error
		)

		JustBeforeEach(func() {
			executeErr = nullInt.IsValidValue(input)
		})

		When("the value is a positive integer", func() {
			BeforeEach(func() {
				input = "1"
			})

			It("does not error", func() {
				Expect(executeErr).ToNot(HaveOccurred())
			})
		})

		When("the value is a negative integer", func() {
			BeforeEach(func() {
				input = "-21"
			})

			It("does not error", func() {
				Expect(executeErr).ToNot(HaveOccurred())
			})
		})

		When("the value is a non integer", func() {
			BeforeEach(func() {
				input = "not-a-integer"
			})

			It("returns an error", func() {
				Expect(executeErr).To(MatchError("invalid integer value `not-a-integer`"))
			})
		})
	})

	Describe("ParseIntValue", func() {
		When("nil is provided", func() {
			It("sets IsSet to false", func() {
				nullInt.ParseIntValue(nil)
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: false}))
			})
		})

		When("non-nil pointer is provided", func() {
			It("sets IsSet to true and Value to provided value", func() {
				n := 5
				nullInt.ParseIntValue(&n)
				Expect(nullInt).To(Equal(NullInt{Value: 5, IsSet: true}))
			})
		})
	})

	Describe("ParseStringValue", func() {
		When("the empty string is provided", func() {
			It("sets IsSet to false", func() {
				err := nullInt.ParseStringValue("")
				Expect(err).ToNot(HaveOccurred())
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: false}))
			})
		})

		When("an invalid integer is provided", func() {
			It("returns an error", func() {
				err := nullInt.ParseStringValue("abcdef")
				Expect(err).To(MatchError(&flags.Error{
					Type:    flags.ErrMarshal,
					Message: "invalid integer value `abcdef`",
				}))
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: false}))
			})
		})

		When("a valid integer is provided", func() {
			It("stores the integer and sets IsSet to true", func() {
				err := nullInt.ParseStringValue("0")
				Expect(err).ToNot(HaveOccurred())
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: true}))
			})
		})
	})

	Describe("UnmarshalJSON", func() {
		When("integer value is provided", func() {
			It("parses JSON number correctly", func() {
				err := nullInt.UnmarshalJSON([]byte("42"))
				Expect(err).ToNot(HaveOccurred())
				Expect(nullInt).To(Equal(NullInt{Value: 42, IsSet: true}))
			})
		})

		When("a null value is provided", func() {
			It("returns an unset NullInt", func() {
				err := nullInt.UnmarshalJSON([]byte("null"))
				Expect(err).ToNot(HaveOccurred())
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: false}))
			})
		})

		When("an empty string is provided", func() {
			It("returns an unset NullInt", func() {
				err := nullInt.UnmarshalJSON([]byte(""))
				Expect(err).ToNot(HaveOccurred())
				Expect(nullInt).To(Equal(NullInt{Value: 0, IsSet: false}))
			})
		})
	})

	DescribeTable("MarshalJSON",
		func(nullInt NullInt, expectedBytes []byte) {
			bytes, err := nullInt.MarshalJSON()
			Expect(err).ToNot(HaveOccurred())
			Expect(bytes).To(Equal(expectedBytes))
		},
		Entry("negative number", NullInt{IsSet: true, Value: -1}, []byte("-1")),
		Entry("positive number", NullInt{IsSet: true, Value: 1}, []byte("1")),
		Entry("0", NullInt{IsSet: true, Value: 0}, []byte("0")),
		Entry("no value", NullInt{IsSet: false}, []byte("null")),
	)
})