GoLand No Tests Were Run : 不能使用 fmt.Printf() <BUG;

Posted 2022-07-01 禅与计算机程序设计艺术

问题描述：

I have a method that I am testing, and everything seems fine. However, when I run the tests in GoLand, I can see in the output that the tests "PASS" but the test runner says "no tests were run".

Here's the sample method in calculator.go

package calculator

import (
    "fmt"
)

type Calculator struct 

func New() Calculator 
    return Calculator



func (s *Calculator) AddTwoNumbers(num_one, num_two int) int 
    fmt.Printf("adding")
    return num_one + num_two

Here's the test in calculator_test.go:

package calculator

import (
    "fmt"
    "testing"
)

func Test_Calculator_AddTwoNumbers(t *testing.T) 
    // Arrange
    calculator := New()

    // Act
    total := calculator.AddTwoNumbers(1,2)

    // Assert
    if total != 3 
        msg := fmt.Sprintf("total should have been %d but instead was %d", 3, total)
        t.Error(msg)
    

问题解决：

Instead of fmt.Printf() in AddTwoNumbers try either fmt.Println() or fmt.Printf("foo\\n')

The absence of the newline in the output of your AddTwoNumbers method is is causing the format of the test execution outputs to not have each test in a new line. The test runner is not being able to interpret that a test was run. Adding that newline, keeps a clean output.

https://stackoverflow.com/questions/68607771/goland-no-tests-were-run

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