Some initial work on formatters

src/spectator/formatting/formatter.cr

@@ -1,27 +1,8 @@
+require "../reporters"
+
 module Spectator::Formatting
-  # Interface for reporting test progress and results.
+  abstract class Formatter < Reporters::Reporter
-  #
+    def initialize(@output : IO)
-  # The methods should be called in this order:
+    end
-  # 1. `#start_suite`
-  # 2. `#start_example`
-  # 3. `#end_example`
-  # 4. `#end_suite`
-  #
-  # Steps 2 and 3 are called for each example in the suite.
-  abstract class Formatter
-    # Called when a test suite is starting to execute.
-    abstract def start_suite(suite : TestSuite)
-
-    # Called when a test suite finishes.
-    # The results from the entire suite are provided.
-    # The *profile* value is not nil when profiling results should be displayed.
-    abstract def end_suite(report : Report, profile : Profile?)
-
-    # Called before a test starts.
-    abstract def start_example(example : Example)
-
-    # Called when a test finishes.
-    # The result of the test is available through *example*.
-    abstract def end_example(example : Example)
   end
 end

src/spectator/formatting/progress_formatter.cr

@@ -0,0 +1,16 @@
+require "./formatter"
+
+module Spectator::Formatting
+  # Output formatter that produces a single character for each test as it completes.
+  # A '.' indicates a pass, 'F' a failure, and '*' a skipped or pending test.
+  class ProgressFormatter < Formatter
+    def pass(notification)
+    end
+
+    def fail(notification)
+    end
+
+    def pending(notification)
+    end
+  end
+end