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

describe('tryCatch', function() {
  function headX(ls) {    return ls[0].x;  }
  function catcher() {    return 10101;  }
  it('takes two functions and return a function', function() {    var mayThrow = R.tryCatch(headX, catcher);    eq(typeof mayThrow, 'function');  });
  it('returns a function with the same arity as the `tryer` function', function() {    function a1(a) { return a; }    function a2(a, b) { return b; }    function a3(a, b, c) { return c; }    function a4(a, b, c, d) { return d; }
    eq(R.tryCatch(a1, catcher).length, a1.length);    eq(R.tryCatch(a2, catcher).length, a2.length);    eq(R.tryCatch(a3, catcher).length, a3.length);    eq(R.tryCatch(a4, catcher).length, a4.length);  });
  it('returns the value of the first function if it does not throw', function() {    var mayThrow = R.tryCatch(headX, catcher);    eq(mayThrow([{x: 10}, {x: 20}, {x: 30}]), 10);  });
  it('returns the value of the second function if the first function throws', function() {    function throw10() {      throw new Error(10);    }
    function eCatcher(e) {      return Number(e.message);    }
    var mayThrow = R.tryCatch(headX, catcher);    eq(mayThrow([]), 10101);
    var willThrow = R.tryCatch(throw10, eCatcher);    eq(willThrow([]), 10);    eq(willThrow([{}, {}, {}]), 10);  });
  it('the second function gets passed the error object and the same arguments as the first function', function() {    function thrower(a, b, c) {      void c;      throw new Error('throwerError');    }
    function catch3(e, a, b, c) {      return [e.message, a, b, c].join(' ');    }
    var mayThrow = R.tryCatch(thrower, catch3);    eq(mayThrow('A', 'B', 'C'), 'throwerError A B C');  });});