func TestMkDir(t *testing.T) { err := MkDir("/path/to/new/directory") if err != nil { t.Errorf("Error creating directory: %v", err) } }Description: The test case checks whether the MkDir function creates a new directory successfully. If an error occurs during directory creation, the test case fails. Package library: launchpad.net/gocheck In conclusion, launchpad.net/gocheck is a testing library for Go that includes different testing functions and methods such as MkDir, which allows you to create a new directory.