Variable in It spec text always 0 although changed in BeforeEach in ginkgo/gomega

Question

In my code snippet below or https://play.golang.org/p/tLld-zNF2zp, testValue was declared inside Describe block, changed in BeforeEach block. Then, used in.

1. It
2. Expect

The test passes as expected. From the debug log, It always shows testValue should be 0 instead of testValue should be 3

package awesomeProject1_test

import (
    "fmt"
    . "github.com/onsi/ginkgo"
    . "github.com/onsi/gomega"
)

var _ = Describe("AwesomeProject1", func() {
    var testValue int
    BeforeEach(func() {
        testValue = 3
    })
    Context("Correctness of testValue", func() {
        It(fmt.Sprintf("testValue should be %d", testValue), func() {
            Expect(testValue).To(Equal(3))
        })
    })
})

Why is testValue not changed in It statement but inside it?

Answer 1

From ginkgo docs, another Describe wraps Context functions :

var _ = Describe("Book", func() {
    var (
        longBook  Book
        shortBook Book
    )

    BeforeEach(func() {
        longBook = Book{
            Title:  "Les Miserables",
            Author: "Victor Hugo",
            Pages:  2783,
        }

        shortBook = Book{
            Title:  "Fox In Socks",
            Author: "Dr. Seuss",
            Pages:  24,
        }
    })

    //Describe wrapping context
    Describe("Categorizing book length", func() {
        Context("With more than 300 pages", func() {
            It("should be a novel", func() {
                Expect(longBook.CategoryByLength()).To(Equal("NOVEL"))
            })
        })

        Context("With fewer than 300 pages", func() {
            It("should be a short story", func() {
                Expect(shortBook.CategoryByLength()).To(Equal("SHORT STORY"))
            })
        })
    })
})

Answer 2

package ginkgo_test

import (
    "fmt"
    "testing"

    . "github.com/onsi/ginkgo"
    . "github.com/onsi/gomega"
)

var _ = Describe("AwesomeProject1", func() {
    var testValue int
    BeforeEach(func() {
        testValue = 3
    })
    Context("Correctness of testValue", func() {
        It(fmt.Sprintf("testValue should be %d", testValue), func() {
            Expect(testValue).To(Equal(3))
        })
    })
})

func TestGoStudy(t *testing.T) {
    RegisterFailHandler(Fail)
    RunSpecs(t, "GoStudy Suite")
}

=== RUN   TestGoStudy
Running Suite: GoStudy Suite
============================
Random Seed: 1634629701
Will run 1 of 1 specs

•
Ran 1 of 1 Specs in 0.000 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestGoStudy (0.00s)
PASS

Process finished with the exit code 0

I have test your code and code worked well.

My test environment:

go version go1.17.1
github.com/onsi/ginkgo v1.16.5 
github.com/onsi/gomega v1.16.0