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

describe('invoker', function() {
  var concat2 = R.invoker(2, 'concat');
  it('returns a function with correct arity', function() {    eq(concat2.length, 3);  });
  it('calls the method on the object', function() {    eq(concat2(3, 4, [1, 2]), [1, 2, 3, 4]);  });
  it('throws a descriptive TypeError if method does not exist', function() {    assert.throws(      function() { R.invoker(0, 'foo')(null); },      function(err) {        return err.constructor === TypeError &&               err.message === 'null does not have a method named "foo"';      }    );    assert.throws(      function() { R.invoker(0, 'foo')([1, 2, 3]); },      function(err) {        return err.constructor === TypeError &&               err.message === '[1, 2, 3] does not have a method named "foo"';      }    );    assert.throws(      function() { R.invoker(0, 'length')([1, 2, 3]); },      function(err) {        return err.constructor === TypeError &&               err.message === '[1, 2, 3] does not have a method named "length"';      }    );  });
  it('does not rely on constructor identity', function() {    eq(concat2([2], [3], vm.runInNewContext('[1]')), [1, 2, 3]);  });
  it('curries the method call', function() {    eq(concat2(3)(4)([1, 2]), [1, 2, 3, 4]);    eq(concat2(3, 4)([1, 2]), [1, 2, 3, 4]);    eq(concat2(3)(4, [1, 2]), [1, 2, 3, 4]);  });
});