Replace FailureMessage with LabeledText

src/spectator/formatting/failure_block.cr

@@ -53,7 +53,7 @@ module Spectator::Formatting
     # Produces a list of unsatisfied expectations and their values.
     private def unsatisfied_expectations(indent)
       @result.expectations.each_unsatisfied do |expectation|
-        indent.line(FailureMessage.color(@result))
+        indent.line(Color.failure(LabeledText.new("Failure", expectation.actual_message)))
         indent.line
         indent.increase do
           matcher_values(indent, expectation)
@@ -72,9 +72,9 @@ module Spectator::Formatting
 
     # Produces the stack trace for an errored result.
     private def error_stacktrace(indent)
-      indent.line(FailureMessage.color(@result))
-      indent.line
       error = @result.error
+      indent.line(Color.error(LabeledText.new("Error", error)))
+      indent.line
       indent.increase do
         loop do
           display_error(indent, error)

src/spectator/formatting/failure_message.cr

@@ -1,35 +0,0 @@
-module Spectator::Formatting
-  # Produces a stringified failure or error message.
-  private struct FailureMessage
-    # Creates the failure message.
-    def initialize(@result : FailedResult)
-    end
-
-    # Appends the message to the output.
-    def to_s(io)
-      io << @result.call(Label)
-      io << @result.error
-    end
-
-    # Creates a colorized version of the message.
-    def self.color(result)
-      result.call(Color) { |result| new(result) }
-    end
-
-    # Interface for `Result#call` to invoke.
-    # This is used to get the correct prefix for failures and errors.
-    private module Label
-      extend self
-
-      # Returns the prefix for a failure message.
-      def failure
-        "Failure: "
-      end
-
-      # Returns the prefix for an error message.
-      def error
-        "Error: "
-      end
-    end
-  end
-end

src/spectator/formatting/labeled_text.cr

@@ -0,0 +1,15 @@
+module Spectator::Formatting
+  # Produces a stringified message with a prefix.
+  private struct LabeledText(T)
+    # Creates the labeled text.
+    def initialize(@label : String, @text : T)
+    end
+
+    # Appends the message to the output.
+    def to_s(io)
+      io << @label
+      io << ": "
+      io << @text
+    end
+  end
+end