Add multiplexed writer to constructor method NewCommand

Author: SimonBaeumer

command.go

@@ -59,8 +59,8 @@ func NewCommand(cmd string, options ...func(*Command)) *Command {
 		Env:      []string{},
 	}
 
-	c.StdoutWriter = &c.stdout
-	c.StderrWriter = &c.stderr
+	c.StdoutWriter = NewMultiplexedWriter(&c.stdout, &c.combined)
+	c.StderrWriter = NewMultiplexedWriter(&c.stderr, &c.combined)
 
 	for _, o := range options {
 		o(c)

command_test.go

@@ -11,8 +11,11 @@ import (
 )
 
 func TestCommand_NewCommand(t *testing.T) {
-	cmd := NewCommand("")
-	assert.False(t, cmd.Executed())
+	cmd := NewCommand("echo hello")
+	cmd.Execute()
+
+	assertEqualWithLineBreak(t, "hello", cmd.Combined())
+	assertEqualWithLineBreak(t, "hello", cmd.Stdout())
 }
 
 func TestCommand_Execute(t *testing.T) {