Merge pull request #98 from miclast/fix_clean

Fixed clean method

Author: yegor256

lib/zache.rb

@@ -177,7 +177,11 @@ def remove_by
 
   # Remove keys that are expired.
   def clean
-    synchronized { @hash.delete_if { |_key, value| expired?(value) } }
+    synchronized { @hash.delete_if { |key, _value| expired?(key) } }
+  end
+
+  def empty?
+    @hash.empty?
   end
 
   private

test/test_zache.rb

@@ -134,6 +134,14 @@ def test_clean
     assert(cache.exists?(:bye) == false)
   end
 
+  def test_clean_size
+    cache = Zache.new
+    cache.get(:hey, lifetime: 0.01) { Random.rand }
+    sleep 0.1
+    cache.clean
+    assert(cache.empty?)
+  end
+
   def test_clean_with_sync_false
     cache = Zache.new(sync: false)
     cache.get(:hey) { Random.rand }