ThrowException can accept string to match exception message

Author: janmarek

README.md

@@ -139,6 +139,7 @@ expect(fn).to.throwException(function (e) { // get the exception object
   expect(e).to.be.a(SyntaxError);
 });
 expect(fn).to.throwException(/matches the exception message/);
+expect(fn).to.throwException('exactly matches the exception message');
 expect(fn2).to.not.throwException();
 ```
 
@@ -208,7 +209,7 @@ and shown/processed by the test runner.
 
 ## Differences with should.js
 
-- No need for static `should` methods like `should.strictEqual`. For example, 
+- No need for static `should` methods like `should.strictEqual`. For example,
   `expect(obj).to.be(undefined)` works well.
 - Some API simplifications / changes.
 - API changes related to browser compatibility.

index.js

@@ -155,13 +155,20 @@
         } else {
           expect(subject).to.match(fn);
         }
+      } else if ('string' == typeof fn) {
+        var subject = 'string' == typeof e ? e : e.message;
+        if (not) {
+          expect(subject).not.to.equal(fn);
+        } else {
+          expect(subject).to.equal(fn);
+        }
       } else if ('function' == typeof fn) {
         fn(e);
       }
       thrown = true;
     }
 
-    if (isRegExp(fn) && not) {
+    if ((isRegExp(fn) && not) || ('string' == typeof fn && not)) {
       // in the presence of a matcher, ensure the `not` only applies to
       // the matching.
       this.flags.not = false;
@@ -637,7 +644,7 @@
       if (isDate(value) && $keys.length === 0) {
         return stylize(value.toUTCString(), 'date');
       }
-      
+
       // Error objects can be shortcutted
       if (value instanceof Error) {
         return stylize("["+value.toString()+"]", 'Error');

test/expect.js

@@ -133,6 +133,13 @@ describe('expect', function () {
       expect(itThrowsMessage).to.throwException(/no match/);
     }, 'expected \'tobi\' to match /no match/');
 
+    expect(itThrowsMessage).to.throwException('tobi');
+    expect(itThrowsMessage).to.not.throwException('test');
+
+    err(function () {
+      expect(itThrowsMessage).to.throwException('no match');
+    }, 'expected \'tobi\' to equal \'no match\'');
+
     var subject2;
 
     expect(itThrowsString).to.throwException(function (str) {
@@ -382,7 +389,7 @@ describe('expect', function () {
     err(function () {
       expect('asd').to.have.property('foo');
     }, "expected 'asd' to have a property 'foo'");
-    
+
     err(function () {
       expect({ length: undefined }).to.not.have.property('length');
     }, "expected { length: undefined } to not have a property 'length'");
@@ -403,7 +410,7 @@ describe('expect', function () {
     err(function () {
       expect('asd').to.not.have.property('foo', 3);
     }, "'asd' has no property 'foo'");
-    
+
     err(function () {
       expect({ length: undefined }).to.not.have.property('length', undefined);
     }, "expected { length: undefined } to not have a property 'length'");