diff --git a/tests/helpers/formats_helper_tests.rb b/tests/helpers/formats_helper_tests.rb
index 8bd857c73..9553a76c3 100644
--- a/tests/helpers/formats_helper_tests.rb
+++ b/tests/helpers/formats_helper_tests.rb
@@ -1,56 +1,143 @@
 Shindo.tests('test_helper', 'meta') do
 
+  tests('#formats backwards compatible changes') do
+
+    tests('when value matches schema expectation') do
+      formats({"key" => String}) { {"key" => "Value"} }
+    end
+
+    tests('when values within an array all match schema expectation') do
+      formats({"key" => [Integer]}) { {"key" => [1, 2]} }
+    end
+
+    tests('when nested values match schema expectation') do
+      formats({"key" => {:nested_key => String}}) { {"key" => {:nested_key => "Value"}} }
+    end
+
+    tests('when collection of values all match schema expectation') do
+      formats([{"key" => String}]) { [{"key" => "Value"}, {"key" => "Value"}] }
+    end
+
+    tests('when collection is empty although schema covers optional members') do
+      formats([{"key" => String}]) { [] }
+    end
+
+    tests('when additional keys are passed and not strict') do
+      formats({"key" => String}, false) { {"key" => "Value", :extra => "Bonus"} }
+    end
+
+    tests('when value is nil and schema expects NilClass') do
+      formats({"key" => NilClass}) { {"key" => nil} }
+    end
+
+    tests('when value and schema match as hashes') do
+      formats({}) { {} }
+    end
+
+    tests('when value and schema match as arrays') do
+      formats([]) { [] }
+    end
+
+    tests('when value is a Time') do
+      formats({"time" => Time}) { {"time" => Time.now} }
+    end
+
+    tests('when key is missing but value should be NilClass (#1477)') do
+      formats({"key" => NilClass}) { {} }
+    end
+
+    tests('when key is missing but value is nullable (#1477)') do
+      formats({"key" => Fog::Nullable::String}) { {} }
+    end
+
+  end
+
   tests('#formats_kernel') do
 
     tests('returns true') do
 
-      test('when format of value matches') do
-        formats_kernel({:a => :b}, {:a => Symbol})
+      returns(true, 'when value matches schema expectation') do
+        formats_kernel({"key" => "Value"}, {"key" => String})
       end
 
-      test('when format of nested array elements matches') do
-        formats_kernel({:a => [:b, :c]}, {:a => [Symbol]})
+      returns(true, 'when values within an array all match schema expectation') do
+        formats_kernel({"key" => [1, 2]}, {"key" => [Integer]})
       end
 
-      test('when format of nested hash matches') do
-        formats_kernel({:a => {:b => :c}}, {:a => {:b => Symbol}})
+      returns(true, 'when nested values match schema expectation') do
+        formats_kernel({"key" => {:nested_key => "Value"}}, {"key" => {:nested_key => String}})
       end
 
-      test('when format of an array') do
-        formats_kernel([{:a => :b}], [{:a => Symbol}])
+      returns(true, 'when collection of values all match schema expectation') do
+        formats_kernel([{"key" => "Value"}, {"key" => "Value"}], [{"key" => String}])
       end
 
-      test('non strict extra data') do
-        formats_kernel({:a => :b, :b => :c}, {:a => Symbol}, true, false)
+      returns(true, 'when collection is empty although schema covers optional members') do
+        formats_kernel([], [{"key" => String}])
+      end
+
+      returns(true, 'when additional keys are passed and not strict') do
+        formats_kernel({"key" => "Value", :extra => "Bonus"}, {"key" => String}, true, false)
+      end
+
+      returns(true, 'when value is nil and schema expects NilClass') do
+        formats_kernel({"key" => nil}, {"key" => NilClass})
+      end
+
+      returns(true, 'when value and schema match as hashes') do
+        formats_kernel({}, {})
+      end
+
+      returns(true, 'when value and schema match as arrays') do
+        formats_kernel([], [])
+      end
+
+      returns(true, 'when value is a Time') do
+        formats_kernel({"time" => Time.now}, {"time" => Time})
+      end
+
+      returns(true, 'when key is missing but value should be NilClass (#1477)') do
+        formats_kernel({}, {"key" => NilClass})
+      end
+
+      returns(true, 'when key is missing but value is nullable (#1477)') do
+        formats_kernel({}, {"key" => Fog::Nullable::String})
       end
 
     end
 
     tests('returns false') do
 
-      test('when format of value does not match') do
-        !formats_kernel({:a => :b}, {:a => String})
+      returns(false, 'when value does not match schema expectation') do
+        formats_kernel({"key" => nil}, {"key" => String})
       end
 
-      test('when not all keys are checked') do
-        !formats_kernel({:a => :b}, {})
+      returns(false, 'when key formats do not match') do
+        formats_kernel({"key" => "Value"}, {:key => String})
       end
 
-      test('when some keys do not appear') do
-        !formats_kernel({}, {:a => String})
+      returns(false, 'when additional keys are passed and strict') do
+        formats_kernel({"key" => "Missing"}, {})
       end
 
-      test('when an array is expected but another data type is found') do
-        !formats_kernel({:a => 'not an array'}, {:a => []})
+      returns(false, 'when some keys do not appear') do
+        formats_kernel({}, {"key" => String})
       end
 
-      test('when a hash is expected but another data type is found') do
-        !formats_kernel({:a => 'not a hash'}, {:a => {}}, true, false)
+      returns(false, 'when collection contains a member that does not match schema') do
+        formats_kernel([{"key" => "Value"}, {"key" => 5}], [{"key" => String}])
       end
 
+      returns(false, 'when hash and array are compared') do
+        formats_kernel({}, [])
+      end
 
-      test('non strict extra data') do
-        !formats_kernel({:a => :b, :b => :c}, {:z => Symbol}, true, false)
+      returns(false, 'when array and hash are compared') do
+        formats_kernel([], {})
+      end
+
+      returns(false, 'when a hash is expected but another data type is found') do
+        formats_kernel({"key" => {:nested_key => []}}, {"key" => {:nested_key => {}}})
       end
 
     end