require 'spec_helper'

describe HashDiff do
  it "should be able to diff two equal array" do
    a = [1, 2, 3]
    b = [1, 2, 3]

    diff = HashDiff.diff_array(a, b)
    diff.should == []
  end

  it "should be able to diff two arrays with one element in common" do
    a = [1, 2, 3]
    b = [1, 8, 7]

    diff = HashDiff.diff_array(a, b)
    diff.should == [['-', 2, 3], ['-', 1, 2], ['+', 1, 8], ['+', 2, 7]]
  end

  it "should be able to diff two arrays with nothing in common" do
    a = [1, 2]
    b = []

    diff = HashDiff.diff_array(a, b)
    diff.should == [['-', 1, 2], ['-', 0, 1]]
  end

  it "should be able to diff an empty array with an non-empty array" do
    a = []
    b = [1, 2]

    diff = HashDiff.diff_array(a, b)
    diff.should == [['+', 0, 1], ['+', 1, 2]]
  end

  it "should be able to diff two arrays with two elements in common" do
    a = [1, 3, 5, 7]
    b = [2, 3, 7, 5]

    diff = HashDiff.diff_array(a, b)
    diff.should == [['-', 0, 1], ['+', 0, 2], ['+', 2, 7], ['-', 4, 7]]
  end

  it "should be able to test two arrays with two common elements in different order" do
    a = [1, 3, 4, 7]
    b = [2, 3, 7, 5]

    diff = HashDiff.diff_array(a, b)
    diff.should == [['-', 0, 1], ['+', 0, 2], ['-', 2, 4], ['+', 3, 5]]
  end

  it "should be able to diff two arrays with similar elements" do
    a = [{'a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5}, 3]
    b = [1, {'a' => 1, 'b' => 2, 'c' => 3, 'e' => 5}]
    diff = HashDiff.diff_array(a, b)
    diff.should == [['+', 0, 1], ['-', 2, 3]]
  end

end