Function in same package undefined

Question

My project structure is like this.

packagetest/
    main.go
    lib.go

In main.go, I have this code.

package m         


        

Answer 1

• lib.go should be renamed to main_test.go
• The function signature of the test function should be func Test(t *testing.T) {
• The package testing should be imported in main_test.go.
• Ideally, the Test function should have a name that reflects what it is testing, like TestPrinting.

Then both go build and go test should work.