diff --git a/test/dummy/app/models/dimension/validator/check.rb b/test/dummy/app/models/dimension/validator/check.rb
index 00217e0..9862bda 100644
--- a/test/dummy/app/models/dimension/validator/check.rb
+++ b/test/dummy/app/models/dimension/validator/check.rb
@@ -42,6 +42,13 @@ class Dimension::Validator::Check < ApplicationRecord
     validates :"#{bound}_proc", dimension: { "#{bound}": -> (record) { 500..500 } }
   end
 
+  # Integration tests
+  has_one_attached :width_height_exact
+  validates :width_height_exact, dimension: { width: 600, height: 600 }
+  has_one_attached :width_height_in
+  validates :width_height_in, dimension: { width: { in: 550..750 }, height: { in: 550..750 } }
+
+  # Edge cases
   has_one_attached :with_invalid_media_file
   validates :with_invalid_media_file, dimension: { width: 150, height: 150 }
 end
diff --git a/test/dummy/public/image_500x700.png b/test/dummy/public/image_500x700.png
new file mode 100644
index 0000000..262b962
Binary files /dev/null and b/test/dummy/public/image_500x700.png differ
diff --git a/test/dummy/public/image_600x600.png b/test/dummy/public/image_600x600.png
new file mode 100644
index 0000000..a292833
Binary files /dev/null and b/test/dummy/public/image_600x600.png differ
diff --git a/test/support/files.rb b/test/support/files.rb
index f85fdb0..8a74108 100644
--- a/test/support/files.rb
+++ b/test/support/files.rb
@@ -24,6 +24,22 @@ def image_500x500_file
   }
 end
 
+def image_600x600_file
+  {
+    io: File.open(Rails.root.join('public', 'image_600x600.png')),
+    filename: 'image_600x600_file.png',
+    content_type: 'image/png'
+  }
+end
+
+def image_500x700_file
+  {
+    io: File.open(Rails.root.join('public', 'image_500x700.png')),
+    filename: 'image_500x700_file.png',
+    content_type: 'image/png'
+  }
+end
+
 def image_700x500_file
   {
     io: File.open(Rails.root.join('public', 'image_700x500.png')),
diff --git a/test/validators/aspect_ratio_validator_test.rb b/test/validators/aspect_ratio_validator_test.rb
index 82b75a6..269d480 100644
--- a/test/validators/aspect_ratio_validator_test.rb
+++ b/test/validators/aspect_ratio_validator_test.rb
@@ -151,7 +151,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("aspect_ratio_not_#{named_aspect_ratio}", error_options: error_options) }
+                it { is_expected_to_include_error_message("aspect_ratio_not_#{named_aspect_ratio}", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -183,7 +183,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("aspect_ratio_not_x_y", error_options: error_options) }
+            it { is_expected_to_include_error_message("aspect_ratio_not_x_y", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -218,7 +218,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message('aspect_ratio_invalid', error_options: error_options) }
+            it { is_expected_to_include_error_message('aspect_ratio_invalid', error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -237,7 +237,7 @@
         end
 
         it { is_expected_not_to_be_valid }
-        it { is_expected_to_have_error_message("media_metadata_missing", error_options: error_options) }
+        it { is_expected_to_include_error_message("media_metadata_missing", error_options: error_options) }
         it { is_expected_to_have_error_options(error_options) }
       end
     end
diff --git a/test/validators/attached_validator_test.rb b/test/validators/attached_validator_test.rb
index 02dbad6..38b446a 100644
--- a/test/validators/attached_validator_test.rb
+++ b/test/validators/attached_validator_test.rb
@@ -34,7 +34,7 @@
       subject { model }
 
       it { is_expected_not_to_be_valid }
-      it { is_expected_to_have_error_message("blank", error_options: {}) }
+      it { is_expected_to_include_error_message("blank", error_options: {}) }
     end
 
     describe 'when provided with a file that is marked for destruction' do
@@ -42,7 +42,7 @@
       subject { model.has_to_be_attached.attach(image_1920x1080_file) and model.has_to_be_attached.mark_for_destruction and model }
 
       it { is_expected_not_to_be_valid }
-      it { is_expected_to_have_error_message("blank", error_options: {}) }
+      it { is_expected_to_include_error_message("blank", error_options: {}) }
     end
   end
 
diff --git a/test/validators/content_type_validator_test.rb b/test/validators/content_type_validator_test.rb
index 45a57a0..751a5cc 100644
--- a/test/validators/content_type_validator_test.rb
+++ b/test/validators/content_type_validator_test.rb
@@ -130,7 +130,7 @@
     #     end
 
     #     it { is_expected_not_to_be_valid }
-    #     it { is_expected_to_have_error_message("content_type_invalid", error_options: error_options) }
+    #     it { is_expected_to_include_error_message("content_type_invalid", error_options: error_options) }
     #     it { is_expected_to_have_error_options(error_options) }
     #   end
 
@@ -153,7 +153,7 @@
     #       end
 
     #       it { is_expected_not_to_be_valid }
-    #       it { is_expected_to_have_error_message("content_type_invalid", error_options: error_options) }
+    #       it { is_expected_to_include_error_message("content_type_invalid", error_options: error_options) }
     #       it { is_expected_to_have_error_options(error_options) }
     #     end
 
@@ -203,7 +203,7 @@
     #     end
 
     #     it { is_expected_not_to_be_valid }
-    #     it { is_expected_to_have_error_message("content_type_invalid", error_options: error_options) }
+    #     it { is_expected_to_include_error_message("content_type_invalid", error_options: error_options) }
     #     it { is_expected_to_have_error_options(error_options) }
     #   end
     # end
@@ -244,7 +244,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("content_type_invalid", error_options: error_options) }
+                it { is_expected_to_include_error_message("content_type_invalid", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -289,7 +289,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("content_type_invalid", error_options: error_options) }
+                it { is_expected_to_include_error_message("content_type_invalid", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -353,7 +353,7 @@
           end
 
           it { is_expected_not_to_be_valid }
-          it { is_expected_to_have_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
+          it { is_expected_to_include_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
           it { is_expected_to_have_error_options(error_options, validator: :content_type) }
         end
 
@@ -375,7 +375,7 @@
           end
 
           it { is_expected_not_to_be_valid }
-          it { is_expected_to_have_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
+          it { is_expected_to_include_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
           it { is_expected_to_have_error_options(error_options, validator: :content_type) }
         end
 
@@ -397,7 +397,7 @@
           end
 
           it { is_expected_not_to_be_valid }
-          it { is_expected_to_have_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
+          it { is_expected_to_include_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
           it { is_expected_to_have_error_options(error_options, validator: :content_type) }
         end
 
@@ -457,7 +457,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
+            it { is_expected_to_include_error_message("content_type_spoofed", error_options: error_options, validator: :content_type) }
             it { is_expected_to_have_error_options(error_options, validator: :content_type) }
           end
         end
diff --git a/test/validators/dimension_validator_test.rb b/test/validators/dimension_validator_test.rb
index bbde3b6..550c1fa 100644
--- a/test/validators/dimension_validator_test.rb
+++ b/test/validators/dimension_validator_test.rb
@@ -102,7 +102,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
 
@@ -124,7 +124,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -148,7 +148,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_greater_than_or_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_greater_than_or_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
 
@@ -196,7 +196,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_less_than_or_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_less_than_or_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -220,7 +220,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_greater_than_or_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_greater_than_or_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
 
@@ -242,7 +242,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_less_than_or_equal_to", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_less_than_or_equal_to", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -267,7 +267,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_included_in", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_included_in", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
 
@@ -290,7 +290,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("dimension_#{dimension}_not_included_in", error_options: error_options) }
+                it { is_expected_to_include_error_message("dimension_#{dimension}_not_included_in", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
@@ -319,7 +319,7 @@
               end
 
               it { is_expected_not_to_be_valid }
-              it { is_expected_to_have_error_message("dimension_min_not_included_in", error_options: error_options) }
+              it { is_expected_to_include_error_message("dimension_min_not_included_in", error_options: error_options) }
               it { is_expected_to_have_error_options(error_options) }
             end
 
@@ -371,7 +371,7 @@
               end
 
               it { is_expected_not_to_be_valid }
-              it { is_expected_to_have_error_message("dimension_max_not_included_in", error_options: error_options) }
+              it { is_expected_to_include_error_message("dimension_max_not_included_in", error_options: error_options) }
               it { is_expected_to_have_error_options(error_options) }
             end
           end
@@ -379,6 +379,135 @@
       end
     end
 
+    describe "Integration tests" do
+      describe ":width exact + :height exact" do
+        let(:attribute) { :width_height_exact }
+
+        describe "when provided with an image that has the same width and height as specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_600x600_file) and model }
+
+          it { is_expected_to_be_valid }
+        end
+
+        describe "when provided with an image that has a different width than specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_800x600_file) and model }
+
+          let(:error_options) do
+            {
+              width: 600,
+              height: 600,
+              length: 600,
+              filename: 'image_800x600_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_width_not_equal_to", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+
+        describe "when provided with an image that has a different height than specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_600x800_file) and model }
+
+          let(:error_options) do
+            {
+              width: 600,
+              height: 600,
+              length: 600,
+              filename: 'image_600x800_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_height_not_equal_to", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+
+        describe "when provided with an image that has a different height and a different width than specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_1200x900_file) and model }
+
+          let(:error_options) do
+            {
+              width: 600,
+              height: 600,
+              length: 600,
+              filename: 'image_1200x900_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_width_not_equal_to", error_options: error_options) }
+          it { is_expected_to_include_error_message("dimension_height_not_equal_to", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+      end
+
+      describe ":width in + :height in" do
+        let(:attribute) { :width_height_in }
+
+        describe "when provided with an image that has a valid width and height as specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_600x600_file) and model }
+
+          it { is_expected_to_be_valid }
+        end
+
+        describe "when provided with an image that has lower width than the min specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_500x700_file) and model }
+
+          let(:error_options) do
+            {
+              width: { in: 550..750},
+              height: { in: 550..750 },
+              min: 550,
+              max: 750,
+              filename: 'image_500x700_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_width_not_included_in", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+
+        describe "when provided with an image that has lower height than the min specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_700x500_file) and model }
+
+          let(:error_options) do
+            {
+              width: { in: 550..750},
+              height: { in: 550..750 },
+              min: 550,
+              max: 750,
+              filename: 'image_700x500_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_height_not_included_in", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+
+        describe "when provided with an image that has lower width and height than the mins specified in the model validations" do
+          subject { model.public_send(attribute).attach(image_500x500_file) and model }
+
+          let(:error_options) do
+            {
+              width: { in: 550..750},
+              height: { in: 550..750 },
+              min: 550,
+              max: 750,
+              filename: 'image_500x500_file.png'
+            }
+          end
+
+          it { is_expected_not_to_be_valid }
+          it { is_expected_to_include_error_message("dimension_width_not_included_in", error_options: error_options) }
+          it { is_expected_to_include_error_message("dimension_height_not_included_in", error_options: error_options) }
+          it { is_expected_to_have_error_options(error_options) }
+        end
+      end
+    end
+
     describe "Edge cases" do
       describe "when the passed file is not a valid media" do
         subject { model.public_send(attribute).attach(empty_io_file) and model }
@@ -391,7 +520,7 @@
         end
 
         it { is_expected_not_to_be_valid }
-        it { is_expected_to_have_error_message("media_metadata_missing", error_options: error_options) }
+        it { is_expected_to_include_error_message("media_metadata_missing", error_options: error_options) }
         it { is_expected_to_have_error_options(error_options) }
       end
     end
diff --git a/test/validators/duration_validator_test.rb b/test/validators/duration_validator_test.rb
index 45774fd..a616777 100644
--- a/test/validators/duration_validator_test.rb
+++ b/test/validators/duration_validator_test.rb
@@ -42,7 +42,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -59,7 +59,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -96,7 +96,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_less_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_less_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -121,7 +121,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -138,7 +138,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -169,7 +169,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_greater_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_greater_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -206,7 +206,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -241,7 +241,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("duration_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("duration_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
diff --git a/test/validators/integration/integration_test.rb b/test/validators/integration/integration_test.rb
index 30c1305..cc64a59 100644
--- a/test/validators/integration/integration_test.rb
+++ b/test/validators/integration/integration_test.rb
@@ -23,7 +23,7 @@
       end
 
       it { is_expected_not_to_be_valid }
-      it { is_expected_to_have_error_message("file_not_processable", error_options: error_options, validator: :processable_file) }
+      it { is_expected_to_include_error_message("file_not_processable", error_options: error_options, validator: :processable_file) }
       it { is_expected_to_have_error_options(error_options, validator: :processable_file) }
     end
   end
@@ -51,7 +51,7 @@
           end
 
           it { is_expected_not_to_be_valid }
-          it { is_expected_to_have_error_message("file_size_not_less_than", error_options: error_options, validator: :size) }
+          it { is_expected_to_include_error_message("file_size_not_less_than", error_options: error_options, validator: :size) }
           it { is_expected_to_have_error_options(error_options, validator: :size) }
         end
       end
@@ -69,7 +69,7 @@
           end
 
           it { is_expected_not_to_be_valid }
-          it { is_expected_to_have_error_message("file_size_not_less_than", error_options: error_options, validator: :size) }
+          it { is_expected_to_include_error_message("file_size_not_less_than", error_options: error_options, validator: :size) }
           it { is_expected_to_have_error_options(error_options, validator: :size) }
         end
       end
diff --git a/test/validators/limit_validator_test.rb b/test/validators/limit_validator_test.rb
index 5b9f290..a2e8dbb 100644
--- a/test/validators/limit_validator_test.rb
+++ b/test/validators/limit_validator_test.rb
@@ -75,7 +75,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("limit_min_not_reached", error_options: error_options) }
+            it { is_expected_to_include_error_message("limit_min_not_reached", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -112,7 +112,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("limit_max_exceeded", error_options: error_options) }
+            it { is_expected_to_include_error_message("limit_max_exceeded", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -151,7 +151,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("limit_out_of_range", error_options: error_options) }
+                it { is_expected_to_include_error_message("limit_out_of_range", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
 
@@ -168,7 +168,7 @@
                 end
 
                 it { is_expected_not_to_be_valid }
-                it { is_expected_to_have_error_message("limit_out_of_range", error_options: error_options) }
+                it { is_expected_to_include_error_message("limit_out_of_range", error_options: error_options) }
                 it { is_expected_to_have_error_options(error_options) }
               end
             end
diff --git a/test/validators/processable_file_validator_test.rb b/test/validators/processable_file_validator_test.rb
index 9945284..b7142b1 100644
--- a/test/validators/processable_file_validator_test.rb
+++ b/test/validators/processable_file_validator_test.rb
@@ -44,7 +44,7 @@
       end
 
       it { is_expected_not_to_be_valid }
-      it { is_expected_to_have_error_message("file_not_processable", error_options: error_options) }
+      it { is_expected_to_include_error_message("file_not_processable", error_options: error_options) }
       it { is_expected_to_have_error_options(error_options) }
     end
 
diff --git a/test/validators/shared_examples/works_with_message_option.rb b/test/validators/shared_examples/works_with_message_option.rb
index 5496a2b..a5f5a80 100644
--- a/test/validators/shared_examples/works_with_message_option.rb
+++ b/test/validators/shared_examples/works_with_message_option.rb
@@ -43,7 +43,7 @@ module WorksWithMessageOption
       before { subject.with_message.attach(file_not_matching_requirements) }
 
       it { is_expected_not_to_be_valid }
-      it { is_expected_to_have_error_message("Custom message", error_options: error_options) }
+      it { is_expected_to_include_error_message("Custom message", error_options: error_options) }
       it { is_expected_to_have_error_options(error_options) }
     end
   end
diff --git a/test/validators/size_validator_test.rb b/test/validators/size_validator_test.rb
index b30523a..ef386e2 100644
--- a/test/validators/size_validator_test.rb
+++ b/test/validators/size_validator_test.rb
@@ -41,7 +41,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -58,7 +58,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -95,7 +95,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_less_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_less_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -120,7 +120,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -137,7 +137,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -168,7 +168,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_greater_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_greater_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -205,7 +205,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -240,7 +240,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("file_size_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("file_size_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
diff --git a/test/validators/support/validator_helpers.rb b/test/validators/support/validator_helpers.rb
index 55e5ac0..c990514 100644
--- a/test/validators/support/validator_helpers.rb
+++ b/test/validators/support/validator_helpers.rb
@@ -28,20 +28,20 @@ def is_expected_to_have_error_options(error_options, **kwargs)
     )
   end
 
-  def is_expected_to_have_error_message(message_key, **kwargs)
+  def is_expected_to_include_error_message(message_key, **kwargs)
     subject.valid?(kwargs[:context])
 
-    validator_error_message =
-      subject.errors.find do |error|
+    validator_error_messages =
+      subject.errors.select do |error|
         error.options[:validator_type] == kwargs[:validator] || validator_sym
-      end&.message
+      end.map(&:message)
 
     message = kwargs[:error_options][:custom_message] || I18n.t("errors.messages.#{message_key}", **kwargs[:error_options])
 
-    assert_equal(
+    assert_includes(
+      validator_error_messages,
       message,
-      validator_error_message,
-      "Expected error message to be '#{message.inspect}'\nbut got '#{validator_error_message.inspect}'"
+      "Expected error messages to include '#{message.inspect}'\nbut got #{validator_error_messages.inspect}"
     )
   end
 
diff --git a/test/validators/total_size_validator_test.rb b/test/validators/total_size_validator_test.rb
index e337e00..8968e47 100644
--- a/test/validators/total_size_validator_test.rb
+++ b/test/validators/total_size_validator_test.rb
@@ -50,7 +50,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -66,7 +66,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_less_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_less_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -102,7 +102,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_less_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_less_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end
@@ -126,7 +126,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -142,7 +142,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_greater_than", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_greater_than", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -172,7 +172,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_greater_than_or_equal_to", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_greater_than_or_equal_to", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -208,7 +208,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
 
@@ -242,7 +242,7 @@
             end
 
             it { is_expected_not_to_be_valid }
-            it { is_expected_to_have_error_message("total_file_size_not_between", error_options: error_options) }
+            it { is_expected_to_include_error_message("total_file_size_not_between", error_options: error_options) }
             it { is_expected_to_have_error_options(error_options) }
           end
         end