Fix Cache :redis_store increment/decrement ttl check and add more tests.

activesupport/lib/active_support/cache/redis_cache_store.rb

@@ -264,7 +264,7 @@ def increment(name, amount = 1, options = nil)
           failsafe :increment do
             redis.with do |c|
               val = c.incrby key, amount
-              if expires_in > 0 && c.ttl(key) == -2
+              if expires_in > 0 && c.ttl(key) < 0
                 c.expire key, expires_in
               end
               val
@@ -290,7 +290,7 @@ def decrement(name, amount = 1, options = nil)
           failsafe :decrement do
             redis.with do |c|
               val = c.decrby key, amount
-              if expires_in > 0 && c.ttl(key) == -2
+              if expires_in > 0 && c.ttl(key) < 0
                 c.expire key, expires_in
               end
               val

activesupport/test/cache/stores/redis_cache_store_test.rb

@@ -145,24 +145,40 @@ def test_fetch_multi_uses_redis_mget
     def test_increment_expires_in
       assert_called_with @cache.redis, :incrby, [ "#{@namespace}:foo", 1 ] do
         assert_called_with @cache.redis, :expire, [ "#{@namespace}:foo", 60 ] do
-          @cache.increment("foo", 1, expires_in: 60)
+          @cache.increment "foo", 1, expires_in: 60
         end
       end
 
+      # key and ttl exist
+      @cache.redis.setex "#{@namespace}:bar", 120, 1
       assert_not_called @cache.redis, :expire do
-        @cache.decrement("foo", 1, expires_in: 60)
+        @cache.increment "bar", 1, expires_in: 120
+      end
+
+      # key exist but not have expire
+      @cache.redis.set "#{@namespace}:dar", 10
+      assert_called_with @cache.redis, :expire, [ "#{@namespace}:dar", 60 ] do
+        @cache.increment "dar", 1, expires_in: 60
       end
     end
 
     def test_decrement_expires_in
       assert_called_with @cache.redis, :decrby, [ "#{@namespace}:foo", 1 ] do
         assert_called_with @cache.redis, :expire, [ "#{@namespace}:foo", 60 ] do
-          @cache.decrement("foo", 1, expires_in: 60)
+          @cache.decrement "foo", 1, expires_in: 60
         end
       end
 
+      # key and ttl exist
+      @cache.redis.setex "#{@namespace}:bar", 120, 1
       assert_not_called @cache.redis, :expire do
-        @cache.decrement("foo", 1, expires_in: 60)
+        @cache.decrement "bar", 1, expires_in: 120
+      end
+
+      # key exist but not have expire
+      @cache.redis.set "#{@namespace}:dar", 10
+      assert_called_with @cache.redis, :expire, [ "#{@namespace}:dar", 60 ] do
+        @cache.decrement "dar", 1, expires_in: 60
       end
     end
   end