How to Run Go Unit Tests with Custom Working Directories?

Golang: Unit Testing with Custom Working Directories

When writing unit tests in Go, it's common to need to load configuration files or other resources from a specific directory. By default, Go tests inherit the working directory of the process that invoked them, which may not be the same as the directory where the test files are located. This can lead to errors if the tests rely on files that are not available in the current working directory.

Solution:

One solution is to modify the working directory before running the tests. This can be done using the os.Chdir function to change the current working directory to the desired location.

Here's an example:

<code class="go">import (
    "os"
    "testing"
)

func TestWithWorkingDirectory(t *testing.T) {
    os.Chdir("path/to/custom/working/directory")
    // Run tests here
}</code>

Another approach is to use the Caller function to get the path to the current test source file. This can be used to determine the parent directory of the test file, which is likely where the configuration files are located.

Here's an example using Caller:

<code class="go">package sample

import (
    "testing"
    "runtime"
    "fmt"
)

func TestGetFilename(t *testing.T) {
    _, filename, _, _ := runtime.Caller(0)
    parentDir := filepath.Dir(filepath.Dir(filename))
    os.Chdir(parentDir)
    // Run tests here
}</code>

Note that the filepath.Dir function is used to get the parent directory of the test file. This assumes that the configuration files are located in the parent directory. If this is not the case, you can modify the code to navigate to the appropriate directory.

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