diff --git a/spec/active_interaction/filters/array_filter_spec.rb b/spec/active_interaction/filters/array_filter_spec.rb
index 43a27848..ac484132 100644
--- a/spec/active_interaction/filters/array_filter_spec.rb
+++ b/spec/active_interaction/filters/array_filter_spec.rb
@@ -36,11 +36,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with an Array' do
       let(:value) { [] }
 
       it 'returns the Array' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -48,7 +50,7 @@
       let(:value) { [[], false, 0.0, {}, 0, '', :''] }
 
       it 'returns the Array' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -59,7 +61,7 @@
         let(:value) { [] }
 
         it 'returns the Array' do
-          expect(filter.cast(value)).to eql value
+          expect(result).to eql value
         end
       end
 
@@ -67,7 +69,7 @@
         let(:value) { [[]] }
 
         it 'returns the Array' do
-          expect(filter.cast(value)).to eql value
+          expect(result).to eql value
         end
       end
 
@@ -76,7 +78,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
diff --git a/spec/active_interaction/filters/date_filter_spec.rb b/spec/active_interaction/filters/date_filter_spec.rb
index 4642cfb5..b8decb7c 100644
--- a/spec/active_interaction/filters/date_filter_spec.rb
+++ b/spec/active_interaction/filters/date_filter_spec.rb
@@ -15,11 +15,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Date' do
       let(:value) { Date.new }
 
       it 'returns the Date' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { '2011-12-13' }
 
       it 'returns a Date' do
-        expect(filter.cast(value)).to eql Date.parse(value)
+        expect(result).to eql Date.parse(value)
       end
 
       context 'with format' do
@@ -36,7 +38,7 @@
         let(:value) { '13/12/2011' }
 
         it 'returns a Date' do
-          expect(filter.cast(value)).to eql Date.strptime(value, format)
+          expect(result).to eql Date.strptime(value, format)
         end
       end
     end
@@ -46,7 +48,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
 
@@ -55,7 +57,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -74,7 +76,7 @@
       end
 
       it 'returns a Date' do
-        expect(filter.cast(value)).to eql Date.new(year, month, day)
+        expect(result).to eql Date.new(year, month, day)
       end
     end
 
@@ -84,7 +86,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -98,7 +100,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
diff --git a/spec/active_interaction/filters/date_time_filter_spec.rb b/spec/active_interaction/filters/date_time_filter_spec.rb
index 7c21a814..37ad6c61 100644
--- a/spec/active_interaction/filters/date_time_filter_spec.rb
+++ b/spec/active_interaction/filters/date_time_filter_spec.rb
@@ -15,11 +15,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Datetime' do
       let(:value) { DateTime.new }
 
       it 'returns the DateTime' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { '2011-12-13T14:15:16+17:18' }
 
       it 'returns a DateTime' do
-        expect(filter.cast(value)).to eql DateTime.parse(value)
+        expect(result).to eql DateTime.parse(value)
       end
 
       context 'with format' do
@@ -36,7 +38,7 @@
         let(:value) { '13/12/2011 14:15:16 +17:18' }
 
         it 'returns a DateTime' do
-          expect(filter.cast(value)).to eql DateTime.strptime(value, format)
+          expect(result).to eql DateTime.strptime(value, format)
         end
       end
     end
@@ -46,7 +48,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
 
@@ -55,7 +57,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -81,7 +83,7 @@
 
       it 'returns a DateTime' do
         expect(
-          filter.cast(value)
+          result
         ).to eql DateTime.new(year, month, day, hour, min, sec)
       end
     end
@@ -92,7 +94,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -106,7 +108,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
diff --git a/spec/active_interaction/filters/decimal_filter_spec.rb b/spec/active_interaction/filters/decimal_filter_spec.rb
index c058ec6b..9ffd86cf 100644
--- a/spec/active_interaction/filters/decimal_filter_spec.rb
+++ b/spec/active_interaction/filters/decimal_filter_spec.rb
@@ -15,11 +15,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Float' do
       let(:value) { rand }
 
       it 'returns the BigDecimal' do
-        expect(filter.cast(value)).to eql BigDecimal.new(value, 0)
+        expect(result).to eql BigDecimal.new(value, 0)
       end
 
       context 'with :digits option' do
@@ -28,7 +30,7 @@
         let(:value) { 1.23456789 }
 
         it 'returns BigDecimal with given digits' do
-          expect(filter.cast(value)).to eql BigDecimal.new('1.235')
+          expect(result).to eql BigDecimal.new('1.235')
         end
       end
     end
@@ -37,7 +39,7 @@
       let(:value) { rand(1 << 16) }
 
       it 'returns a BigDecimal' do
-        expect(filter.cast(value)).to eql BigDecimal.new(value)
+        expect(result).to eql BigDecimal.new(value)
       end
     end
 
@@ -45,7 +47,7 @@
       let(:value) { rand.to_s }
 
       it 'returns a BigDecimal' do
-        expect(filter.cast(value)).to eql BigDecimal.new(value)
+        expect(result).to eql BigDecimal.new(value)
       end
     end
 
@@ -54,7 +56,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
     end
diff --git a/spec/active_interaction/filters/file_filter_spec.rb b/spec/active_interaction/filters/file_filter_spec.rb
index 46a6c63f..69e129fc 100644
--- a/spec/active_interaction/filters/file_filter_spec.rb
+++ b/spec/active_interaction/filters/file_filter_spec.rb
@@ -7,11 +7,13 @@
   it_behaves_like 'a filter'
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a File' do
       let(:value) { File.new(__FILE__) }
 
       it 'returns the File' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -19,7 +21,7 @@
       let(:value) { Tempfile.new(SecureRandom.hex) }
 
       it 'returns the Tempfile' do
-        expect(filter.cast(value)).to eq value
+        expect(result).to eq value
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { double(tempfile: Tempfile.new(SecureRandom.hex)) }
 
       it 'returns the Tempfile' do
-        expect(filter.cast(value)).to eq value.tempfile
+        expect(result).to eq value.tempfile
       end
     end
   end
diff --git a/spec/active_interaction/filters/float_filter_spec.rb b/spec/active_interaction/filters/float_filter_spec.rb
index e8794fee..e759ef3c 100644
--- a/spec/active_interaction/filters/float_filter_spec.rb
+++ b/spec/active_interaction/filters/float_filter_spec.rb
@@ -7,11 +7,13 @@
   it_behaves_like 'a filter'
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Float' do
       let(:value) { rand }
 
       it 'returns the Float' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -19,7 +21,7 @@
       let(:value) { rand(1 << 16) }
 
       it 'returns a Float' do
-        expect(filter.cast(value)).to eql value.to_f
+        expect(result).to eql value.to_f
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { rand.to_s }
 
       it 'returns a Float' do
-        expect(filter.cast(value)).to eql Float(value)
+        expect(result).to eql Float(value)
       end
     end
 
@@ -36,7 +38,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
     end
diff --git a/spec/active_interaction/filters/hash_filter_spec.rb b/spec/active_interaction/filters/hash_filter_spec.rb
index d41de9b5..492896e5 100644
--- a/spec/active_interaction/filters/hash_filter_spec.rb
+++ b/spec/active_interaction/filters/hash_filter_spec.rb
@@ -15,11 +15,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Hash' do
       let(:value) { {} }
 
       it 'returns the Hash' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { { a: {} } }
 
       it 'returns an empty Hash' do
-        expect(filter.cast(value)).to eql({})
+        expect(result).to eql({})
       end
     end
 
@@ -38,7 +40,7 @@
         let(:value) { { a: {} } }
 
         it 'returns the Hash' do
-          expect(filter.cast(value)).to eql value
+          expect(result).to eql value
         end
 
         context 'with String keys' do
@@ -47,7 +49,7 @@
           end
 
           it 'does not raise an error' do
-            expect { filter.cast(value) }.to_not raise_error
+            expect { result }.to_not raise_error
           end
         end
       end
@@ -59,13 +61,13 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidNestedValueError
         end
 
         it 'populates the error' do
           begin
-            filter.cast(value)
+            result
           rescue ActiveInteraction::InvalidNestedValueError => e
             expect(e.filter_name).to eql k
             expect(e.input_value).to eql v
@@ -82,11 +84,11 @@
       end
 
       it 'symbolizes String keys' do
-        expect(filter.cast(value)).to have_key :a
+        expect(result).to have_key :a
       end
 
       it 'leaves other keys alone' do
-        expect(filter.cast(value)).to have_key 1
+        expect(result).to have_key 1
       end
     end
   end
diff --git a/spec/active_interaction/filters/integer_filter_spec.rb b/spec/active_interaction/filters/integer_filter_spec.rb
index 553280cc..be6ca7c2 100644
--- a/spec/active_interaction/filters/integer_filter_spec.rb
+++ b/spec/active_interaction/filters/integer_filter_spec.rb
@@ -7,11 +7,13 @@
   it_behaves_like 'a filter'
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with an Integer' do
       let(:value) { rand(1 << 16) }
 
       it 'returns the Integer' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -19,7 +21,7 @@
       let(:value) { rand(1 << 16) + rand }
 
       it 'returns an Integer' do
-        expect(filter.cast(value)).to eql value.to_i
+        expect(result).to eql value.to_i
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { rand(1 << 16).to_s }
 
       it 'returns an Integer' do
-        expect(filter.cast(value)).to eql Integer(value)
+        expect(result).to eql Integer(value)
       end
     end
 
@@ -36,7 +38,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
     end
diff --git a/spec/active_interaction/filters/model_filter_spec.rb b/spec/active_interaction/filters/model_filter_spec.rb
index af6268a4..37b19e16 100644
--- a/spec/active_interaction/filters/model_filter_spec.rb
+++ b/spec/active_interaction/filters/model_filter_spec.rb
@@ -14,14 +14,15 @@ class Model; end
 
   describe '#cast' do
     let(:value) { Model.new }
+    let(:result) { filter.cast(value) }
 
     context 'with class as a Class' do
       it 'returns the instance' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
 
       it 'handles reconstantizing' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
 
         Object.send(:remove_const, :Model)
         class Model; end
@@ -69,7 +70,7 @@ def self.name
       end
 
       it 'returns the instance' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -79,7 +80,7 @@ def self.name
       end
 
       it 'returns the instance' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -90,7 +91,7 @@ def self.name
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidClassError
       end
     end
diff --git a/spec/active_interaction/filters/string_filter_spec.rb b/spec/active_interaction/filters/string_filter_spec.rb
index 0aecc742..bf3356dd 100644
--- a/spec/active_interaction/filters/string_filter_spec.rb
+++ b/spec/active_interaction/filters/string_filter_spec.rb
@@ -13,11 +13,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a String' do
       let(:value) { SecureRandom.hex }
 
       it 'returns the String' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -25,14 +27,14 @@
       let(:value) { " #{SecureRandom.hex} " }
 
       it 'returns the stripped string' do
-        expect(filter.cast(value)).to eql value.strip
+        expect(result).to eql value.strip
       end
 
       context 'without strip' do
         include_context 'without strip'
 
         it 'returns the String' do
-          expect(filter.cast(value)).to eql value
+          expect(result).to eql value
         end
       end
     end
diff --git a/spec/active_interaction/filters/symbol_filter_spec.rb b/spec/active_interaction/filters/symbol_filter_spec.rb
index 3000e045..bfc9ad0f 100644
--- a/spec/active_interaction/filters/symbol_filter_spec.rb
+++ b/spec/active_interaction/filters/symbol_filter_spec.rb
@@ -7,11 +7,13 @@
   it_behaves_like 'a filter'
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Symbol' do
       let(:value) { SecureRandom.hex.to_sym }
 
       it 'returns the Symbol' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -19,7 +21,7 @@
       let(:value) { SecureRandom.hex }
 
       it 'returns a Symbol' do
-        expect(filter.cast(value)).to eql value.to_sym
+        expect(result).to eql value.to_sym
       end
     end
   end
diff --git a/spec/active_interaction/filters/time_filter_spec.rb b/spec/active_interaction/filters/time_filter_spec.rb
index c10c7b03..b44a6c16 100644
--- a/spec/active_interaction/filters/time_filter_spec.rb
+++ b/spec/active_interaction/filters/time_filter_spec.rb
@@ -15,11 +15,13 @@
   end
 
   describe '#cast' do
+    let(:result) { filter.cast(value) }
+
     context 'with a Time' do
       let(:value) { Time.new }
 
       it 'returns the Time' do
-        expect(filter.cast(value)).to eql value
+        expect(result).to eql value
       end
     end
 
@@ -27,7 +29,7 @@
       let(:value) { '2011-12-13 14:15:16 +1718' }
 
       it 'returns a Time' do
-        expect(filter.cast(value)).to eql Time.parse(value)
+        expect(result).to eql Time.parse(value)
       end
 
       context 'with format' do
@@ -36,7 +38,7 @@
         let(:value) { '13/12/2011 14:15:16 +1718' }
 
         it 'returns a Time' do
-          expect(filter.cast(value)).to eql Time.strptime(value, format)
+          expect(result).to eql Time.strptime(value, format)
         end
       end
     end
@@ -46,7 +48,7 @@
 
       it 'raises an error' do
         expect do
-          filter.cast(value)
+          result
         end.to raise_error ActiveInteraction::InvalidValueError
       end
 
@@ -55,7 +57,7 @@
 
         it do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -81,7 +83,7 @@
 
       it 'returns a Time' do
         expect(
-          filter.cast(value)
+          result
         ).to eql Time.new(year, month, day, hour, min, sec)
       end
     end
@@ -92,7 +94,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end
@@ -106,7 +108,7 @@
 
         it 'raises an error' do
           expect do
-            filter.cast(value)
+            result
           end.to raise_error ActiveInteraction::InvalidValueError
         end
       end