Replace some lookup hashes in Spec with exhaustive cases (#15879)

Author: HertzDevil

src/spec/context.cr

@@ -116,6 +116,24 @@ module Spec
     Fail
     Error
     Pending
+
+    def color : Colorize::Color
+      case self
+      in Success then Colorize::ColorANSI::Green
+      in Fail    then Colorize::ColorANSI::Red
+      in Error   then Colorize::ColorANSI::Red
+      in Pending then Colorize::ColorANSI::Yellow
+      end
+    end
+
+    def letter : Char
+      case self
+      in Success then '.'
+      in Fail    then 'F'
+      in Error   then 'E'
+      in Pending then '*'
+      end
+    end
   end
 
   # :nodoc:

src/spec/dsl.cr

@@ -11,36 +11,20 @@ module Spec
     Comment
     Focus
     Order
-  end
 
-  private STATUS_COLORS = {
-    Status::Success => :green,
-    Status::Fail    => :red,
-    Status::Error   => :red,
-    Status::Pending => :yellow,
-  }
-
-  private INFO_COLORS = {
-    InfoKind::Comment => :cyan,
-    InfoKind::Focus   => :cyan,
-    InfoKind::Order   => :cyan,
-  }
-
-  private LETTERS = {
-    Status::Success => '.',
-    Status::Fail    => 'F',
-    Status::Error   => 'E',
-    Status::Pending => '*',
-  }
+    def color : Colorize::Color
+      Colorize::ColorANSI::Cyan
+    end
+  end
 
   # :nodoc:
   def self.color(str, status : Status)
-    str.colorize(STATUS_COLORS[status])
+    str.colorize(status.color)
   end
 
   # :nodoc:
   def self.color(str, kind : InfoKind)
-    str.colorize(INFO_COLORS[kind])
+    str.colorize(kind.color)
   end
 
   # :nodoc:

src/spec/formatter.cr

@@ -38,7 +38,7 @@ module Spec
     end
 
     def report(result)
-      @io << Spec.color(LETTERS[result.kind], result.kind)
+      @io << Spec.color(result.kind.letter, result.kind)
       split_lines
       @io.flush
     end