From 051fd95d88cbf7b967ac819e2cc482ce9fc3837f Mon Sep 17 00:00:00 2001
From: Chris Polis <cpolis@dssd.com>
Date: Tue, 30 Dec 2014 12:26:19 -0800
Subject: [PATCH] cleaned out `.by` for #333

---
 lib/chai/core/assertions.js | 29 ++---------------------------
 test/assert.js              |  2 --
 test/expect.js              |  3 ---
 test/should.js              |  4 ----
 4 files changed, 2 insertions(+), 36 deletions(-)

diff --git a/lib/chai/core/assertions.js b/lib/chai/core/assertions.js
index 2dc52a37e..a5699c659 100644
--- a/lib/chai/core/assertions.js
+++ b/lib/chai/core/assertions.js
@@ -1429,15 +1429,10 @@ module.exports = function (chai, _) {
     var fn = flag(this, 'object');
     new Assertion(object, msg).to.have.property(prop);
     new Assertion(fn).is.a('function');
-    flag(this, 'property', prop);
 
     var initial = object[prop];
     fn();
 
-    if ('number' == typeof initial) {
-      flag(this, 'delta', object[prop] - initial);
-    }
-
     this.assert(
       initial !== object[prop]
       , 'expected .' + prop + ' to change'
@@ -1475,12 +1470,9 @@ module.exports = function (chai, _) {
 
     var initial = object[prop];
     fn();
-    var delta = object[prop] - initial;
-    flag(this, 'delta', delta);
-    flag(this, 'property', prop);
 
     this.assert(
-      delta > 0
+      object[prop] - initial > 0
       , 'expected .' + prop + ' to increase'
       , 'expected .' + prop + ' to not increase'
     );
@@ -1516,12 +1508,9 @@ module.exports = function (chai, _) {
 
     var initial = object[prop];
     fn();
-    var delta = object[prop] - initial;
-    flag(this, 'delta', -delta);
-    flag(this, 'property', prop);
 
     this.assert(
-      delta < 0
+      object[prop] - initial < 0
       , 'expected .' + prop + ' to decrease'
       , 'expected .' + prop + ' to not decrease'
     );
@@ -1530,18 +1519,4 @@ module.exports = function (chai, _) {
   Assertion.addChainableMethod('decrease', assertDecreases);
   Assertion.addChainableMethod('decreases', assertDecreases);
 
-  function assertChangesBy (expected, msg) {
-    if (msg) flag(this, 'message', msg);
-    var obj   = flag(this, 'object'),
-        prop  = flag(this, 'property'),
-        delta = flag(this, 'delta');
-
-    this.assert(
-      delta === expected
-      , 'expected .' + prop + ' to change by ' + expected
-      , 'expected .' + prop + ' to not change by ' + expected
-    );
-  }
-
-  Assertion.addMethod('by', assertChangesBy);
 };
diff --git a/test/assert.js b/test/assert.js
index e657fd52d..1445ccb35 100644
--- a/test/assert.js
+++ b/test/assert.js
@@ -707,11 +707,9 @@ describe('assert', function () {
         smFn  = function() { obj.value += 0 };
 
     assert.decreases(decFn, obj, 'value');
-    assert.decreasesBy(decFn, obj, 'value', 3);
     assert.doesNotDecrease(smFn, obj, 'value');
 
     assert.increases(incFn, obj, 'value');
-    assert.increasesBy(incFn, obj, 'value', 2);
     assert.doesNotIncrease(smFn, obj, 'value');
   });
 
diff --git a/test/expect.js b/test/expect.js
index beff66aca..df0cabc0d 100644
--- a/test/expect.js
+++ b/test/expect.js
@@ -907,7 +907,6 @@ describe('expect', function () {
         bangFn = function() { obj.str += '!' };
 
     expect(fn).to.change(obj, 'value');
-    expect(fn).to.change(obj, 'value').by(5);
     expect(sameFn).to.not.change(obj, 'value');
     expect(sameFn).to.not.change(obj, 'str');
     expect(bangFn).to.change(obj, 'str');
@@ -922,12 +921,10 @@ describe('expect', function () {
     expect(smFn).to.not.increase(obj, 'value');
     expect(decFn).to.not.increase(obj, 'value');
     expect(incFn).to.increase(obj, 'value');
-    expect(incFn).to.increase(obj, 'value').by(2);
 
     expect(smFn).to.not.decrease(obj, 'value');
     expect(incFn).to.not.decrease(obj, 'value');
     expect(decFn).to.decrease(obj, 'value');
-    expect(decFn).to.decrease(obj, 'value').by(3);
   });
 
 
diff --git a/test/should.js b/test/should.js
index 150bc9c8d..c122a01a6 100644
--- a/test/should.js
+++ b/test/should.js
@@ -787,8 +787,6 @@ describe('should', function() {
         bangFn = function() { obj.str += '!' }; 
 
     fn.should.change(obj, 'value');
-    fn.should.change(obj, 'value').by(5);
-    decFn.should.change(obj, 'value').by(-3);
     sameFn.should.not.change(obj, 'value');
     sameFn.should.not.change(obj, 'str');
     bangFn.should.change(obj, 'str');
@@ -803,11 +801,9 @@ describe('should', function() {
     smFn.should.not.increase(obj, 'value');
     decFn.should.not.increase(obj, 'value');
     incFn.should.increase(obj, 'value');
-    incFn.should.increase(obj, 'value').by(2);
 
     smFn.should.not.decrease(obj, 'value');
     incFn.should.not.decrease(obj, 'value');
     decFn.should.decrease(obj, 'value');
-    decFn.should.decrease(obj, 'value').by(3);
   });
 });