Set up placeholder formatters

src/spectator/formatting/broadcast_formatter.cr

@@ -6,8 +6,7 @@ module Spectator::Formatting
   class BroadcastFormatter < Formatter
     # Creates the broadcast formatter.
     # Takes a collection of formatters to pass events along to.
-    def initialize(formatters : Enumerable(Formatter))
-      @formatters = formatters.to_a
+    def initialize(@formatters : Enumerable(Formatter))
     end
   end
 end

src/spectator/formatting/document_formatter.cr

@@ -0,0 +1,14 @@
+require "./formatter"
+
+module Spectator::Formatting
+  class DocumentFormatter < Formatter
+    def pass(notification)
+    end
+
+    def fail(notification)
+    end
+
+    def pending(notification)
+    end
+  end
+end

src/spectator/formatting/json_formatter.cr

@@ -0,0 +1,14 @@
+require "./formatter"
+
+module Spectator::Formatting
+  class JSONFormatter < Formatter
+    def pass(notification)
+    end
+
+    def fail(notification)
+    end
+
+    def pending(notification)
+    end
+  end
+end

src/spectator/formatting/junit_formatter.cr

@@ -0,0 +1,17 @@
+require "./formatter"
+
+module Spectator::Formatting
+  class JUnitFormatter < Formatter
+    def initialize(output_dir)
+    end
+
+    def pass(notification)
+    end
+
+    def fail(notification)
+    end
+
+    def pending(notification)
+    end
+  end
+end

src/spectator/formatting/tap_formatter.cr

@@ -0,0 +1,14 @@
+require "./formatter"
+
+module Spectator::Formatting
+  class TAPFormatter < Formatter
+    def pass(notification)
+    end
+
+    def fail(notification)
+    end
+
+    def pending(notification)
+    end
+  end
+end