tests for the do things Library

do-things-library-tests.go

package lib

import (
	"testing"

	"os"

	"github.com/stretchr/testify/require"
)

// TestMain isn't actually necessary to be in the test file, just here to demonstrate
// setup + teardown in Go's STD testing
func TestMain(m *testing.M) {
	// this is the place for setup + teardown for all tests
	// for individual test setup + teardown, that can be done in each test individually.
	// for shared setup/teardown just create some helper functions.

	// call flag.Parse() here if TestMain uses flags
	os.Exit(m.Run())
}

func TestDoThings(t *testing.T) {
	tests := []struct {
		name          string
		input         string
		errorExpected bool
	}{
		{
			name:          "test 1",
			input:         "thing 1",
			errorExpected: false,
		},
		{
			name:          "test 2",
			input:         "thing 2",
			errorExpected: false,
		},
		{
			name:          "test 3",
			input:         "Cat in the Hat",
			errorExpected: true,
		},
	}

	for _, tt := range tests {
		tc := tt // need to capture because going to be running in parallel
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			err := DoThings(tc.input)
			if err == nil == tc.errorExpected {
				t.Fatal()
			}
		})
	}
}

func TestDoThingsLongform(t *testing.T) {
	assert := require.New(t)

	err := DoThings("thing 1")
	assert.NoError(err)

	err = DoThings("thing 2")
	assert.NoError(err)

	err = DoThings("Cat in the Hat")
	assert.Error(err)
}