jasmine/spec/core/PrettyPrintSpec.js

describe("j$.pp", function () {
  it("should wrap strings in single quotes", function() {
    expect(j$.pp("some string")).toEqual("'some string'");
    expect(j$.pp("som' string")).toEqual("'som' string'");
  });

  it("should stringify primitives properly", function() {
    expect(j$.pp(true)).toEqual("true");
    expect(j$.pp(false)).toEqual("false");
    expect(j$.pp(null)).toEqual("null");
    expect(j$.pp(jasmine.undefined)).toEqual("undefined");
    expect(j$.pp(3)).toEqual("3");
    expect(j$.pp(-3.14)).toEqual("-3.14");
    expect(j$.pp(-0)).toEqual("-0");
  });

  it("should stringify arrays properly", function() {
    expect(j$.pp([1, 2])).toEqual("[ 1, 2 ]");
    expect(j$.pp([1, 'foo', {}, jasmine.undefined, null])).toEqual("[ 1, 'foo', {  }, undefined, null ]");
  });

  it("should indicate circular array references", function() {
    var array1 = [1, 2];
    var array2 = [array1];
    array1.push(array2);
    expect(j$.pp(array1)).toEqual("[ 1, 2, [ <circular reference: Array> ] ]");
  });

  it("should stringify objects properly", function() {
    expect(j$.pp({foo: 'bar'})).toEqual("{ foo: 'bar' }");
    expect(j$.pp({foo:'bar', baz:3, nullValue: null, undefinedValue: jasmine.undefined})).toEqual("{ foo: 'bar', baz: 3, nullValue: null, undefinedValue: undefined }");
    expect(j$.pp({foo: function () {
    }, bar: [1, 2, 3]})).toEqual("{ foo: Function, bar: [ 1, 2, 3 ] }");
  });

  it("should not include inherited properties when stringifying an object", function() {
    var SomeClass = function() {};
    SomeClass.prototype.foo = "inherited foo";
    var instance = new SomeClass();
    instance.bar = "my own bar";
    expect(j$.pp(instance)).toEqual("{ bar: 'my own bar' }");
  });

  it("should not recurse objects and arrays more deeply than j$.MAX_PRETTY_PRINT_DEPTH", function() {
    var originalMaxDepth = j$.MAX_PRETTY_PRINT_DEPTH;
    var nestedObject = { level1: { level2: { level3: { level4: "leaf" } } } };
    var nestedArray  = [1, [2, [3, [4, "leaf"]]]];

    try {
      j$.MAX_PRETTY_PRINT_DEPTH = 2;
      expect(j$.pp(nestedObject)).toEqual("{ level1: { level2: Object } }");
      expect(j$.pp(nestedArray)).toEqual("[ 1, [ 2, Array ] ]");

      j$.MAX_PRETTY_PRINT_DEPTH = 3;
      expect(j$.pp(nestedObject)).toEqual("{ level1: { level2: { level3: Object } } }");
      expect(j$.pp(nestedArray)).toEqual("[ 1, [ 2, [ 3, Array ] ] ]");

      j$.MAX_PRETTY_PRINT_DEPTH = 4;
      expect(j$.pp(nestedObject)).toEqual("{ level1: { level2: { level3: { level4: 'leaf' } } } }");
      expect(j$.pp(nestedArray)).toEqual("[ 1, [ 2, [ 3, [ 4, 'leaf' ] ] ] ]");
    } finally {
      j$.MAX_PRETTY_PRINT_DEPTH = originalMaxDepth;
    }
  });

  it("should stringify immutable circular objects", function(){
    var frozenObject = {foo: {bar: 'baz'}};
    frozenObject.circular = frozenObject;
    frozenObject = Object.freeze(frozenObject);
    expect(j$.pp(frozenObject)).toEqual("{ foo: { bar: 'baz' }, circular: <circular reference: Object> }");
  });

  it("should truncate arrays that are longer than j$.MAX_PRETTY_PRINT_ARRAY_LENGTH", function() {
    var originalMaxLength = j$.MAX_PRETTY_PRINT_ARRAY_LENGTH;
    var array = [1, 2, 3];

    try {
      j$.MAX_PRETTY_PRINT_ARRAY_LENGTH = 2;
      expect(j$.pp(array)).toEqual("[ 1, 2, ... ]");
    } finally {
      j$.MAX_PRETTY_PRINT_ARRAY_LENGTH = originalMaxLength;
    }
  });

  it("should stringify RegExp objects properly", function() {
    expect(j$.pp(/x|y|z/)).toEqual("/x|y|z/");
  });

  it("should indicate circular object references", function() {
    var sampleValue = {foo: 'hello'};
    sampleValue.nested = sampleValue;
    expect(j$.pp(sampleValue)).toEqual("{ foo: 'hello', nested: <circular reference: Object> }");
  });

  it("should indicate getters on objects as such", function() {
    var sampleValue = {id: 1};
    if (sampleValue.__defineGetter__) {
      //not supported in IE!
      sampleValue.__defineGetter__('calculatedValue', function() {
        throw new Error("don't call me!");
      });
    }
    if (sampleValue.__defineGetter__) {
      expect(j$.pp(sampleValue)).toEqual("{ id: 1, calculatedValue: <getter> }");
    }
    else {
      expect(j$.pp(sampleValue)).toEqual("{ id: 1 }");
    }
  });


  it('should not do HTML escaping of strings', function() {
    expect(j$.pp('some <b>html string</b> &', false)).toEqual('\'some <b>html string</b> &\'');
  });

  it("should abbreviate the global (usually window) object", function() {
    expect(j$.pp(jasmine.getGlobal())).toEqual("<global>");
  });

  it("should stringify Date objects properly", function() {
    var now = new Date();
    expect(j$.pp(now)).toEqual("Date(" + now.toString() + ")");
  });

  it("should stringify spy objects properly", function() {
    var TestObject = {
          someFunction: function() {}
        },
        env = new j$.Env();

    env.spyOn(TestObject, 'someFunction');
    expect(j$.pp(TestObject.someFunction)).toEqual("spy on someFunction");

    expect(j$.pp(j$.createSpy("something"))).toEqual("spy on something");
  });

  it("should stringify objects that implement jasmineToString", function () {
    var obj = {
      jasmineToString: function () { return "strung"; }
    };

    expect(j$.pp(obj)).toEqual("strung");
  });

  it("should handle objects with null prototype", function() {
    if (jasmine.getEnv().ieVersion < 9) { return; }

    var obj = Object.create(null);
    obj.foo = 'bar';

    expect(j$.pp(obj)).toEqual("{ foo: 'bar' }");
  });
});