From 9b599ca4b948a869dbf9397aeda63c609f21eaad Mon Sep 17 00:00:00 2001
From: Lena Stotska <lenakyh@gmail.com>
Date: Wed, 10 Jan 2018 17:29:36 +0200
Subject: [PATCH] feat(spy): adds original function body to be exposed in
 spy.toString()

Fixes #26
---
 chai-spies.js |  7 ++++---
 lib/spy.js    |  5 +++--
 test/spies.js | 11 +++++++++++
 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/chai-spies.js b/chai-spies.js
index 61189c4..175d945 100644
--- a/chai-spies.js
+++ b/chai-spies.js
@@ -21,7 +21,8 @@ var spy = function (chai, _) {
     , i = _.inspect
     , STATE_KEY = typeof Symbol === 'undefined' ? '__state' : Symbol('state')
     , spyAmount = 0
-    , DEFAULT_SANDBOX = new Sandbox();
+    , DEFAULT_SANDBOX = new Sandbox()
+    , noop = function () {};
 
   /**
    * # Sandbox constructor (function)
@@ -189,7 +190,7 @@ var spy = function (chai, _) {
       name = undefined;
     }
 
-    fn = fn || function () {};
+    fn = fn || noop;
 
     function makeProxy (length, fn) {
       switch (length) {
@@ -224,7 +225,7 @@ var spy = function (chai, _) {
       if (l > 0)
         s += ", " + l + " call" + (l > 1 ? 's' : '');
       s += " }";
-      return s;
+      return s + (fn !== noop ? "\n" + fn.toString() : '');
     };
 
     proxy.__spy = {
diff --git a/lib/spy.js b/lib/spy.js
index 92d3b41..b064bb7 100644
--- a/lib/spy.js
+++ b/lib/spy.js
@@ -16,6 +16,7 @@ module.exports = function (chai, _) {
     , STATE_KEY = typeof Symbol === 'undefined' ? '__state' : Symbol('state')
     , spyAmount = 0
     , DEFAULT_SANDBOX = new Sandbox()
+    , noop = function () {}
 
   /**
    * # Sandbox constructor (function)
@@ -183,7 +184,7 @@ module.exports = function (chai, _) {
       name = undefined;
     }
 
-    fn = fn || function () {};
+    fn = fn || noop;
 
     function makeProxy (length, fn) {
       switch (length) {
@@ -218,7 +219,7 @@ module.exports = function (chai, _) {
       if (l > 0)
         s += ", " + l + " call" + (l > 1 ? 's' : '');
       s += " }";
-      return s;
+      return s + (fn !== noop ? "\n" + fn.toString() : '');
     };
 
     proxy.__spy = {
diff --git a/test/spies.js b/test/spies.js
index 68451e4..a2d8865 100644
--- a/test/spies.js
+++ b/test/spies.js
@@ -29,21 +29,32 @@ describe('Chai Spies', function () {
     it('should print out nice', function() {
       chai.spy().toString().should.equal("{ Spy }");
     });
+
     it('should show the name', function() {
       chai.spy('Nikita').toString().should.equal("{ Spy 'Nikita' }");
     });
+
     it('should expose number of invokations', function() {
       var spy = chai.spy()
       spy(); // 1
       spy(); // 2
       spy.toString().should.equal("{ Spy, 2 calls }");
     });
+
     it('should expose name and number of invokations', function() {
       var spy = chai.spy('Nikita')
       spy(); // 1
       spy.toString().should.equal("{ Spy 'Nikita', 1 call }");
     });
 
+    it('should expose original function `toString` representation', function() {
+      function test(a, b, c) {
+        return a + b + c;
+      }
+
+      var spy = chai.spy(test);
+      spy.toString().should.equal("{ Spy }\n" + test.toString());
+    });
   });
 
   it('should return the value of the mock function', function() {