hclwrite: Recast TestRoundupCreate as an example

Since the goal of this is to be somewhat realistic of what a caller might
do, we might as well also include it in the godoc examples.

hclwrite/examples_test.go

@@ -1,17 +1,13 @@
 package hclwrite_test
 
 import (
-	"bytes"
-	"strings"
-	"testing"
+	"fmt"
 
 	"github.com/hashicorp/hcl2/hclwrite"
 	"github.com/zclconf/go-cty/cty"
 )
 
-// TestRoundupCreate is a test that exercises a number of different codepaths
-// to create a file from scratch, like a calling application might.
-func TestRoundupCreate(t *testing.T) {
+func Example_generateFromScratch() {
 	f := hclwrite.NewEmptyFile()
 	rootBody := f.Body()
 	rootBody.SetAttributeValue("string", cty.StringVal("bar")) // this is overwritten later
@@ -39,28 +35,24 @@ func TestRoundupCreate(t *testing.T) {
 	bazBody.SetAttributeValue("beep", cty.StringVal("boop"))
 	bazBody.SetAttributeValue("baz", cty.ListValEmpty(cty.String))
 
-	got := string(bytes.TrimSpace(f.Bytes()))
-	want := strings.TrimSpace(`
-string = "foo"
-
-object = {bar = 5, baz = true, foo = "foo"}
-bool   = false
-
-foo {
-  hello = "world"
-}
-empty {
-}
-
-bar "a" "b" {
-  baz {
-    foo  = 10
-    beep = "boop"
-    baz  = []
-  }
-}
-`)
-	if got != want {
-		t.Errorf("wrong result\ngot:\n%s\n\nwant:\n%s", got, want)
-	}
+	fmt.Printf("%s", f.Bytes())
+	// Output:
+	// string = "foo"
+	//
+	// object = {bar = 5, baz = true, foo = "foo"}
+	// bool   = false
+	//
+	// foo {
+	//   hello = "world"
+	// }
+	// empty {
+	// }
+	//
+	// bar "a" "b" {
+	//   baz {
+	//     foo  = 10
+	//     beep = "boop"
+	//     baz  = []
+	//   }
+	// }
 }