capture_test.go

package testza_test

import (
	"fmt"
	"io"
	"os"
	"strconv"
	"testing"

	. "github.com/MarvinJWendt/testza"
)

func TestCaptureStdout(t *testing.T) {
	type args struct {
		capture func(w io.Writer) error
	}
	tests := []struct {
		args args
		want string
	}{
		{args: args{capture: func(w io.Writer) error { fmt.Print("Hello, World!"); return nil }}, want: "Hello, World!"},
		{args: args{capture: func(w io.Writer) error { fmt.Print(" Hello, World! "); return nil }}, want: " Hello, World! "},
		{args: args{capture: func(w io.Writer) error { fmt.Fprint(w, "Hello, World!"); return nil }}, want: "Hello, World!"},
		{args: args{capture: func(w io.Writer) error { fmt.Print("H\ne\nl\nl\nl\no\n\n\n\nWorld!"); return nil }}, want: "H\ne\nl\nl\nl\no\n\n\n\nWorld!"},
		{args: args{capture: func(w io.Writer) error { fmt.Println("Hello, World!"); return nil }}, want: "Hello, World!\n"},
		{args: args{capture: func(w io.Writer) error { fmt.Println("Hello, \nWorld!"); return nil }}, want: "Hello, \nWorld!\n"},
	}

	for i, tt := range tests {
		t.Run(strconv.Itoa(i), func(t *testing.T) {
			got, err := CaptureStdout(tt.args.capture)
			AssertNil(t, err)
			AssertEqual(t, got, tt.want)
		})
	}
}

func TestCaptureStderr(t *testing.T) {
	type args struct {
		capture func(w io.Writer) error
	}
	tests := []struct {
		args args
		want string
	}{
		{args: args{capture: func(w io.Writer) error { fmt.Fprint(os.Stderr, "Hello, World!"); return nil }}, want: "Hello, World!"},
		{args: args{capture: func(w io.Writer) error { fmt.Fprint(os.Stderr, " Hello, World! "); return nil }}, want: " Hello, World! "},
		{args: args{capture: func(w io.Writer) error { fmt.Fprint(w, "Hello, World!"); return nil }}, want: "Hello, World!"},
		{args: args{capture: func(w io.Writer) error { fmt.Fprint(os.Stderr, "H\ne\nl\nl\nl\no\n\n\n\nWorld!"); return nil }}, want: "H\ne\nl\nl\nl\no\n\n\n\nWorld!"},
		{args: args{capture: func(w io.Writer) error { fmt.Fprintln(os.Stderr, "Hello, World!"); return nil }}, want: "Hello, World!\n"},
		{args: args{capture: func(w io.Writer) error { fmt.Fprintln(os.Stderr, "Hello, \nWorld!"); return nil }}, want: "Hello, \nWorld!\n"},
	}

	for i, tt := range tests {
		t.Run(strconv.Itoa(i), func(t *testing.T) {
			got, err := CaptureStderr(tt.args.capture)
			AssertNil(t, err)
			AssertEqual(t, got, tt.want)
		})
	}
}

func TestCaptureStdoutAndStderr(t *testing.T) {
	stdout, stderr, err := CaptureStdoutAndStderr(func(stdoutWriter, stderrWriter io.Writer) error {
		fmt.Fprint(os.Stdout, "Hello")
		fmt.Fprint(os.Stderr, "World")
		return nil
	})

	AssertEqual(t, stdout, "Hello")
	AssertEqual(t, stderr, "World")
	AssertNoError(t, err)
}