some-every.test.js

describe("#hasOddNumber", function() {
  it("returns true if there is at least one odd number in the array", function() {
    expect(hasOddNumber([1, 2, 2, 2, 2, 2, 4])).toEqual(true);
  });
  it("returns false if there are no odd numbers in the array", function() {
    expect(hasOddNumber([2, 2, 2, 2, 2, 4])).toEqual(false);
  });
});

describe("#hasAZero", function() {
  it("returns true if the number contains at least one 0", function() {
    expect(hasAZero(33321232131012)).toEqual(true);
  });
  it("returns false if the number does not have any zeros", function() {
    expect(hasAZero(1212121)).toEqual(false);
  });
});

describe("#hasOnlyOddNumbers", function() {
  it("returns true if every number in the array is odd", function() {
    expect(hasOnlyOddNumbers([1, 3, 5, 7])).toEqual(true);
  });
  it("returns false if there is one or more even numbers ", function() {
    expect(hasOnlyOddNumbers([1, 2, 3, 5, 7])).toEqual(false);
  });
});

describe("#hasNoDuplicates", function() {
  it("returns true if there are no duplicates in the array", function() {
    expect(hasNoDuplicates([1, 2, 3, 1])).toEqual(false);
  });
  it("returns false if there are duplicates in the array", function() {
    expect(hasNoDuplicates([1, 2, 3])).toEqual(true);
  });
});

describe("#hasCertainKey", function() {
  var arr = [
    { first: "Elie", last: "Schoppik" },
    { first: "Tim", last: "Garcia", isCatOwner: true },
    { first: "Matt", last: "Lane" },
    { first: "Colt", last: "Steele", isCatOwner: true }
  ];
  it("returns true if every object in the array contains a certain key", function() {
    expect(hasCertainKey(arr, "first")).toEqual(true);
  });
  it("returns false if every object in the array does not contain a certain key", function() {
    expect(hasCertainKey(arr, "isCatOwner")).toEqual(false);
  });
});

describe("#hasCertainValue", function() {
  var arr = [
    { title: "Instructor", first: "Elie", last: "Schoppik" },
    { title: "Instructor", first: "Tim", last: "Garcia", isCatOwner: true },
    { title: "Instructor", first: "Matt", last: "Lane" },
    { title: "Instructor", first: "Colt", last: "Steele", isCatOwner: true }
  ];
  it("returns true if every object in an array has the same value for some key", function() {
    expect(hasCertainValue(arr, "title", "Instructor")).toEqual(true);
  });
  it("returns false if every object in an array does not have the same value for some key", function() {
    expect(hasCertainValue(arr, "first", "Elie")).toEqual(false);
  });
});