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

describe('modifyPath', function() {  it('creates a new object by applying the `transformation` function to the given `properties` of the `object`', function() {    var object   = {a: 'Tomato', b: { c: { d: [100, 101, 102] } }, e: { f: 'g', h: [1, 2, 3]  }};    var expected = {a: 'Tomato', b: { c: { d: [100, 102, 102] } }, e: { f: 'g', h: [1, 2, 3] }};    var created  = R.modifyPath(['b', 'c', 'd', 1], R.add(1), object);    eq(created, expected);    // Note: reference equality below!    assert.strictEqual(object.a, created.a);    assert.strictEqual(object.e, created.e);    assert.strictEqual(object.e.h, created.e.h);  });
  it('returns the original object if object does not contain the key', function() {    var object  = {a: 'Tomato', b: { c: { d: [100, 101, 102] } }, e: { f: 'g', h: [1, 2, 3]  }};    var created = R.modifyPath(['b', 'nonexistent', 'd', 1], R.add(1), object);    eq(created, object);    // Note: reference equality below!    assert.strictEqual(object, created);  });
  it('is not destructive', function() {    var object   = {a: 'Tomato', b: { c: { d: [100, 101, 102] } }, e: { f: 'g', h: [1, 2, 3]  }};    var expected = {a: 'Tomato', b: { c: { d: [100, 101, 102] } }, e: { f: 'g', h: [1, 2, 3]  }};    R.modifyPath(['b', 'c', 'd', 1], R.add(1), object);    eq(object, expected);  });
  it('throws error for non-function transformations', function() {    var object   = {a: 'Tomato', b: { c: { d: [100, 101, 102] } }, e: { f: 'g', h: [1, 2, 3]  }};    assert.throws(      function() { R.modifyPath(['b', 'c', 'd', 1], 2, object) ;},      function(err) {        return err.constructor === TypeError &&               err.message === 'fn is not a function';      }    );  });
});