--- a/test/underscore-methods.js	Wed Dec 12 19:09:41 2012 +0900
+++ b/test/underscore-methods.js	Wed Dec 12 19:41:08 2012 +0900
@@ -14,17 +14,11 @@
     }
 });
 
-/*
- TODO: test
-        sortBy
-        groupBy
-        sortedIndex
-        shuffle
-*/
+// TODO: test sortedIndex
 
 test('Underscore methods: basics', function() {
-    equal(shard.first(), a, 'first() works');
-    equal(shard.last(), c, 'last() works');
+    strictEqual(shard.first(), a, 'first() works');
+    strictEqual(shard.last(), c, 'last() works');
     deepEqual(shard.initial(), [a, b], 'initial() works');
     deepEqual(shard.rest(), [b, c], 'rest() works');
     
@@ -38,18 +32,29 @@
     
     equal(shard.all(_.identity), true, 'all() works');
     equal(shard.any(), true, 'any() works');
+    
+    deepEqual(shard.sortBy(function(model) {
+        return -model.get('data').charCodeAt(0);
+    }), [c, b, a], 'sortBy() works');
+    
+    deepEqual(shard.groupBy(function(model) {
+        return model.get('data').charCodeAt(0) % 2;
+    }), {0: [b], 1: [a, c]}, 'groupBy() works');
+    
+    var sh = shard.shuffle().reduce(function(memo, model) { return memo += model.get('data'); }, '');
+    ok(sh.length == 3 && _(sh).contains('a') && _(sh).contains('b') && _(sh).contains('c'), 'shuffle() works');
 });
 
 test('Underscore methods: searching and filtering', function() {
-    equal(shard.min(function(model) {
+    strictEqual(shard.min(function(model) {
         return model.get('data').charCodeAt(0);
     }), a, 'min() works');
     
-    equal(shard.max(function(model) {
+    strictEqual(shard.max(function(model) {
         return model.get('data').charCodeAt(0);
     }), c, 'max() works');
     
-    equal(shard.find(function(model) {
+    strictEqual(shard.find(function(model) {
         return model.get('data') == 'b';
     }), b, 'find() works');