[Matcher] Enhance descriptions and failure messages (#223)

lib/active_storage_validations/matchers/aspect_ratio_validator_matcher.rb

@@ -4,6 +4,7 @@
 require_relative 'concerns/allow_blankable.rb'
 require_relative 'concerns/contextable.rb'
 require_relative 'concerns/messageable.rb'
+require_relative 'concerns/rspecable.rb'
 require_relative 'concerns/validatable.rb'
 
 module ActiveStorageValidations
@@ -17,6 +18,7 @@ class AspectRatioValidatorMatcher
       include AllowBlankable
       include Contextable
       include Messageable
+      include Rspecable
       include Validatable
 
       def initialize(attribute_name)
@@ -25,7 +27,11 @@ def initialize(attribute_name)
       end
 
       def description
-        "validate the aspect ratios allowed on attachment #{@attribute_name}."
+        "validate the aspect ratios allowed on :#{@attribute_name}."
+      end
+
+      def failure_message
+        "is expected to validate aspect ratio of :#{@attribute_name}"
       end
 
       def allowing(*aspect_ratios)
@@ -49,10 +55,6 @@ def matches?(subject)
           all_rejected_aspect_ratios_rejected?
       end
 
-      def failure_message
-        "is expected to validate aspect ratio of #{@attribute_name}"
-      end
-
       protected
 
       def all_allowed_aspect_ratios_allowed?

lib/active_storage_validations/matchers/attached_validator_matcher.rb

@@ -3,6 +3,7 @@
 require_relative 'concerns/active_storageable.rb'
 require_relative 'concerns/contextable.rb'
 require_relative 'concerns/messageable.rb'
+require_relative 'concerns/rspecable.rb'
 require_relative 'concerns/validatable.rb'
 
 module ActiveStorageValidations
@@ -15,14 +16,19 @@ class AttachedValidatorMatcher
       include ActiveStorageable
       include Contextable
       include Messageable
+      include Rspecable
       include Validatable
 
       def initialize(attribute_name)
         @attribute_name = attribute_name
       end
 
       def description
-        "validate #{@attribute_name} must be attached"
+        "validate that :#{@attribute_name} must be attached"
+      end
+
+      def failure_message
+        "is expected to validate attachment of :#{@attribute_name}"
       end
 
       def matches?(subject)
@@ -35,14 +41,6 @@ def matches?(subject)
           is_invalid_when_file_not_attached?
       end
 
-      def failure_message
-        "is expected to validate attached of #{@attribute_name}"
-      end
-
-      def failure_message_when_negated
-        "is expected to not validate attached of #{@attribute_name}"
-      end
-
       private
 
       def is_valid_when_file_attached?

lib/active_storage_validations/matchers/concerns/rspecable.rb

@@ -0,0 +1,26 @@
+require "active_support/concern"
+
+module ActiveStorageValidations
+  module Matchers
+    module Rspecable
+      extend ActiveSupport::Concern
+
+      def initialize(attribute_name)
+        super
+        @failure_message_artefacts = []
+      end
+
+      def description
+        raise NotImplementedError, "#{self.class} did not define #{__method__}"
+      end
+
+      def failure_message
+        raise NotImplementedError, "#{self.class} did not define #{__method__}"
+      end
+
+      def failure_message_when_negated
+        failure_message.sub(/is expected to validate/, 'is expected not to validate')
+      end
+    end
+  end
+end

lib/active_storage_validations/matchers/content_type_validator_matcher.rb

@@ -7,6 +7,7 @@
 require_relative 'concerns/allow_blankable.rb'
 require_relative 'concerns/contextable.rb'
 require_relative 'concerns/messageable.rb'
+require_relative 'concerns/rspecable.rb'
 require_relative 'concerns/validatable.rb'
 
 module ActiveStorageValidations
@@ -20,6 +21,7 @@ class ContentTypeValidatorMatcher
       include AllowBlankable
       include Contextable
       include Messageable
+      include Rspecable
       include Validatable
 
       def initialize(attribute_name)
@@ -28,7 +30,33 @@ def initialize(attribute_name)
       end
 
       def description
-        "validate the content types allowed on attachment #{@attribute_name}"
+        "validate the content types allowed on :#{@attribute_name}"
+      end
+
+      def failure_message
+        message = ["is expected to validate the content types of :#{@attribute_name}"]
+        build_failure_message(message)
+        message.join("\n")
+      end
+
+      def build_failure_message(message)
+        if @allowed_types_not_allowed.present?
+          message << "  the following content type#{'s' if @allowed_types.count > 1} should be allowed: :#{@allowed_types.join(", :")}"
+          message << "  but #{pluralize(@allowed_types_not_allowed)} rejected"
+        end
+
+        if @rejected_types_not_rejected.present?
+          message << "  the following content type#{'s' if @rejected_types.count > 1} should be rejected: :#{@rejected_types.join(", :")}"
+          message << "  but #{pluralize(@rejected_types_not_rejected)} accepted"
+        end
+      end
+
+      def pluralize(types)
+        if types.count == 1
+          ":#{types[0]} was"
+        else
+          ":#{types.join(", :")} were"
+        end
       end
 
       def allowing(*types)
@@ -52,22 +80,6 @@ def matches?(subject)
           all_rejected_types_rejected?
       end
 
-      def failure_message
-        message = ["Expected #{@attribute_name}"]
-
-        if @allowed_types_not_allowed.present?
-          message << "Accept content types: #{@allowed_types.join(", ")}"
-          message << "#{@allowed_types_not_allowed.join(", ")} were rejected"
-        end
-
-        if @rejected_types_not_rejected.present?
-          message << "Reject content types: #{@rejected_types.join(", ")}"
-          message << "#{@rejected_types_not_rejected.join(", ")} were accepted"
-        end
-
-        message.join("\n")
-      end
-
       protected
 
       def all_allowed_types_allowed?

lib/active_storage_validations/matchers/dimension_validator_matcher.rb

@@ -4,6 +4,7 @@
 require_relative 'concerns/allow_blankable.rb'
 require_relative 'concerns/contextable.rb'
 require_relative 'concerns/messageable.rb'
+require_relative 'concerns/rspecable.rb'
 require_relative 'concerns/validatable.rb'
 
 module ActiveStorageValidations
@@ -17,15 +18,38 @@ class DimensionValidatorMatcher
       include AllowBlankable
       include Contextable
       include Messageable
+      include Rspecable
       include Validatable
 
       def initialize(attribute_name)
         @attribute_name = attribute_name
         @width_min = @width_max = @height_min = @height_max = nil
+        @failure_message_artefacts = []
       end
 
       def description
-        "validate image dimensions of #{@attribute_name}"
+        "validate the image dimensions of :#{@attribute_name}"
+      end
+
+      def failure_message
+        message = ["is expected to validate dimensions of :#{@attribute_name}"]
+        build_failure_message(message)
+        message.join("\n")
+      end
+
+      def build_failure_message(message)
+        return unless @failure_message_artefacts.present?
+
+        message << "  but there seem to have issues with the matcher methods you used, since:"
+        @failure_message_artefacts.each do |error_case|
+          message << "  validation failed when provided with a #{error_case[:width]}x#{error_case[:height]}px test image"
+        end
+        message << "  whereas it should have passed"
+      end
+
+      def width(width)
+        @width_min = @width_max = width
+        self
       end
 
       def width_min(width)
@@ -38,8 +62,13 @@ def width_max(width)
         self
       end
 
-      def width(width)
-        @width_min = @width_max = width
+      def width_between(range)
+        @width_min, @width_max = range.first, range.last
+        self
+      end
+
+      def height(height)
+        @height_min = @height_max = height
         self
       end
 
@@ -53,21 +82,11 @@ def height_max(height)
         self
       end
 
-      def width_between(range)
-        @width_min, @width_max = range.first, range.last
-        self
-      end
-
       def height_between(range)
         @height_min, @height_max = range.first, range.last
         self
       end
 
-      def height(height)
-        @height_min = @height_max = height
-        self
-      end
-
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
 
@@ -87,14 +106,6 @@ def matches?(subject)
           height_equals?
       end
 
-      def failure_message
-        <<~MESSAGE
-          is expected to validate dimensions of #{@attribute_name}
-            width between #{@width_min} and #{@width_max}
-            height between #{@height_min} and #{@height_max}
-        MESSAGE
-      end
-
       protected
 
       def valid_width
@@ -106,52 +117,57 @@ def valid_height
       end
 
       def width_not_smaller_than_min?
-        @width_min.nil? || !passes_validation_with_dimensions(@width_min - 1, valid_height, 'width')
+        @width_min.nil? || !passes_validation_with_dimensions(@width_min - 1, valid_height)
       end
 
       def width_larger_than_min?
-        @width_min.nil? || @width_min == @width_max || passes_validation_with_dimensions(@width_min + 1, valid_height, 'width')
+        @width_min.nil? || @width_min == @width_max || passes_validation_with_dimensions(@width_min + 1, valid_height)
       end
 
       def width_smaller_than_max?
-        @width_max.nil? || @width_min == @width_max || passes_validation_with_dimensions(@width_max - 1, valid_height, 'width')
+        @width_max.nil? || @width_min == @width_max || passes_validation_with_dimensions(@width_max - 1, valid_height)
       end
 
       def width_not_larger_than_max?
-        @width_max.nil? || !passes_validation_with_dimensions(@width_max + 1, valid_height, 'width')
+        @width_max.nil? || !passes_validation_with_dimensions(@width_max + 1, valid_height)
       end
 
       def width_equals?
-        @width_min.nil? || @width_min != @width_max || passes_validation_with_dimensions(@width_min, valid_height, 'width')
+        @width_min.nil? || @width_min != @width_max || passes_validation_with_dimensions(@width_min, valid_height)
       end
 
       def height_not_smaller_than_min?
-        @height_min.nil? || !passes_validation_with_dimensions(valid_width, @height_min - 1, 'height')
+        @height_min.nil? || !passes_validation_with_dimensions(valid_width, @height_min - 1)
       end
 
       def height_larger_than_min?
-        @height_min.nil? || @height_min == @height_max || passes_validation_with_dimensions(valid_width, @height_min + 1, 'height')
+        @height_min.nil? || @height_min == @height_max || passes_validation_with_dimensions(valid_width, @height_min + 1)
       end
 
       def height_smaller_than_max?
-        @height_max.nil? || @height_min == @height_max || passes_validation_with_dimensions(valid_width, @height_max - 1, 'height')
+        @height_max.nil? || @height_min == @height_max || passes_validation_with_dimensions(valid_width, @height_max - 1)
       end
 
       def height_not_larger_than_max?
-        @height_max.nil? || !passes_validation_with_dimensions(valid_width, @height_max + 1, 'height')
+        @height_max.nil? || !passes_validation_with_dimensions(valid_width, @height_max + 1)
       end
 
       def height_equals?
-        @height_min.nil? || @height_min != @height_max || passes_validation_with_dimensions(valid_width, @height_min, 'height')
+        @height_min.nil? || @height_min != @height_max || passes_validation_with_dimensions(valid_width, @height_min)
       end
 
-      def passes_validation_with_dimensions(width, height, check)
+      def passes_validation_with_dimensions(width, height)
         mock_dimensions_for(attach_file, width, height) do
           validate
-          is_valid?
+          is_valid? || add_failure_message_artefact(width, height)
         end
       end
 
+      def add_failure_message_artefact(width, height)
+        @failure_message_artefacts << { width: width, height: height }
+        false
+      end
+
       def is_custom_message_valid?
         return true unless @custom_message