text: // Copyright 2016 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  package pretty
  
  import (
  	"fmt"
  	"strings"
  	"testing"
  )
  
  type S struct {
  	X int
  	Y bool
  	z *string
  }
  
  func TestSprint(t *testing.T) {
  	Indent = "~"
  	i := 17
  
  	for _, test := range []struct {
  		value interface{}
  		want  string
  	}{
  		// primitives and pointer
  		{nil, "nil"},
  		{3, "3"},
  		{9.8, "9.8"},
  		{true, "true"},
  		{"foo", `"foo"`},
  		{&i, "&17"},
  		// array and slice
  		{[3]int{1, 2, 3}, "[3]int{\n~1,\n~2,\n~3,\n}"},
  		{[]int{1, 2, 3}, "[]int{\n~1,\n~2,\n~3,\n}"},
  		{[]int{}, "[]int{}"},
  		{[]string{"foo"}, "[]string{\n~\"foo\",\n}"},
  		// map
  		{map[int]bool{}, "map[int]bool{}"},
  		{map[int]bool{1: true, 2: false, 3: true},
  			"map[int]bool{\n~1: true,\n~3: true,\n}"},
  		// struct
  		{S{}, "pretty.S{\n}"},
  		{S{3, true, ptr("foo")},
  			"pretty.S{\n~X: 3,\n~Y: true,\n~z: &\"foo\",\n}"},
  		// interface
  		{[]interface{}{&i}, "[]interface {}{\n~&17,\n}"},
  		// nesting
  		{[]S{{1, false, ptr("a")}, {2, true, ptr("b")}},
  			`[]pretty.S{
  ~pretty.S{
  ~~X: 1,
  ~~z: &"a",
  ~},
  ~pretty.S{
  ~~X: 2,
  ~~Y: true,
  ~~z: &"b",
  ~},
  }`},
  	} {
  		got := fmt.Sprintf("%v", Value(test.value))
  		if got != test.want {
  			t.Errorf("%v: got:\n%q\nwant:\n%q", test.value, got, test.want)
  		}
  	}
  }
  
  func TestWithDefaults(t *testing.T) {
  	Indent = "~"
  	for _, test := range []struct {
  		value interface{}
  		want  string
  	}{
  		{map[int]bool{1: true, 2: false, 3: true},
  			"map[int]bool{\n~1: true,\n~2: false,\n~3: true,\n}"},
  		{S{}, "pretty.S{\n~X: 0,\n~Y: false,\n~z: nil,\n}"},
  	} {
  		got := fmt.Sprintf("%+v", Value(test.value))
  		if got != test.want {
  			t.Errorf("%v: got:\n%q\nwant:\n%q", test.value, got, test.want)
  		}
  	}
  }
  
  func TestBadVerb(t *testing.T) {
  	got := fmt.Sprintf("%d", Value(8))
  	want := "%!d("
  	if !strings.HasPrefix(got, want) {
  		t.Errorf("got %q, want prefix %q", got, want)
  	}
  }
  
  func ptr(s string) *string { return &s }
  