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var assert = require('assert');
var R = require('../source');var eq = require('./shared/eq');

describe('concat', function() {  var z1 = {    x: 'z1',    concat: function(that) { return this.x + ' ' + that.x; }  };  var z2 = {    x: 'z2'  };
  it('adds combines the elements of the two lists', function() {    eq(R.concat(['a', 'b'], ['c', 'd']), ['a', 'b', 'c', 'd']);    eq(R.concat([], ['c', 'd']), ['c', 'd']);  });
  it('works on strings', function() {    eq(R.concat('foo', 'bar'), 'foobar');    eq(R.concat('x', ''), 'x');    eq(R.concat('', 'x'), 'x');    eq(R.concat('', ''), '');  });
  it('delegates to non-String object with a concat method, as second param', function() {    eq(R.concat(z1, z2), 'z1 z2');  });
  it('throws if attempting to combine an array with a non-array', function() {    assert.throws(function() { return R.concat([1], 2); }, TypeError);  });
  it('throws if not an array, String, or object with a concat method', function() {    assert.throws(function() { return R.concat({}, {}); }, TypeError);  });
});