Implemented isBoolean and tests to match

Author: joshkehn

.gitignore

@@ -0,0 +1 @@
+node_modules

lib/assert/macros.js

@@ -119,6 +119,11 @@ assert.isNumber = function (actual, message) {
         assertTypeOf(actual, 'number', message || "expected {actual} to be a Number", assert.isNumber);
     }
 };
+assert.isBoolean = function (actual, message) {
+    if (actual !== true && actual !== false) {
+        assert.fail(actual, 'NaN', message || "expected {actual} to be a Boolean", "===", assert.isBoolean);
+    }
+};
 assert.isNaN = function (actual, message) {
     if (actual === actual) {
         assert.fail(actual, 'NaN', message || "expected {actual} to be NaN", "===", assert.isNaN);

test/assert-test.js

@@ -51,6 +51,11 @@ vows.describe('vows/assert').addBatch({
         "`isNumber`": function (assert) {
             assert.isNumber(0);
         },
+        "`isBoolean`": function (assert){
+            assert.isBoolean(true);
+            assert.isBoolean(false);
+            assertError(assert.isBoolean, 0);
+        },
         "`isNan`": function (assert) {
             assert.isNaN(0/0);
         },