Resque#peek always returns an array.

Consistency of interface is important.

Fixes resque#744.

Author: steveklabnik

lib/resque.rb

@@ -213,7 +213,15 @@ def size(queue)
   # To get the 3rd page of a 30 item, paginatied list one would use:
   #   Resque.peek('my_list', 59, 30)
   def peek(queue, start = 0, count = 1)
-    queue(queue).slice start, count
+    result = queue(queue).slice(start, count)
+
+    if result.nil?
+      []
+    elsif result.respond_to?(:to_ary)
+      result.to_ary || [result]
+    else
+      [result]
+    end
   end
 
   # Does the dirty work of fetching a range of items from a Redis list

test/resque_test.rb

@@ -181,18 +181,18 @@
   end
 
   it "can peek at a queue" do
-    assert_equal({ 'name' => 'chris' }, Resque.peek(:people))
+    assert_equal([{ 'name' => 'chris' }], Resque.peek(:people))
     assert_equal 3, Resque.size(:people)
   end
 
   it "can peek multiple items on a queue" do
-    assert_equal({ 'name' => 'bob' }, Resque.peek(:people, 1, 1))
+    assert_equal([{ 'name' => 'bob' }], Resque.peek(:people, 1, 1))
 
     assert_equal([{ 'name' => 'bob' }, { 'name' => 'mark' }], Resque.peek(:people, 1, 2))
     assert_equal([{ 'name' => 'chris' }, { 'name' => 'bob' }], Resque.peek(:people, 0, 2))
     assert_equal([{ 'name' => 'chris' }, { 'name' => 'bob' }, { 'name' => 'mark' }], Resque.peek(:people, 0, 3))
-    assert_equal({ 'name' => 'mark' }, Resque.peek(:people, 2, 1))
-    assert_equal nil, Resque.peek(:people, 3)
+    assert_equal([{ 'name' => 'mark' }], Resque.peek(:people, 2, 1))
+    assert_equal [], Resque.peek(:people, 3)
     assert_equal [], Resque.peek(:people, 3, 2)
   end