Move helper methods and classes to their own directory

spec/helpers/spy_example.cr

@@ -0,0 +1,37 @@
+# Example that invokes a closure when it is run.
+# This is useful for capturing what's going on when an event is running.
+class SpyExample < Spectator::RunnableExample
+  # Dummy description.
+  def what
+    "SPY"
+  end
+
+  # Captures the sample values when the example is created.
+  def initialize(group, @sample_values)
+    super(group, @sample_values)
+  end
+
+  # Sample values given to the example.
+  getter sample_values : Spectator::Internals::SampleValues
+
+  setter block : Proc(Nil)? = nil
+
+  # Method called by the framework to run the example code.
+  private def run_instance
+    if block = @block
+      block.call
+    end
+  end
+
+  # Creates a spy example.
+  # The block passed to this method will be executed when the example runs.
+  def self.create(&block)
+    hooks = Spectator::ExampleHooks.empty
+    group = Spectator::RootExampleGroup.new(hooks)
+    values = Spectator::Internals::SampleValues.empty
+    new(group, values).tap do |example|
+      group.children = [example.as(Spectator::ExampleComponent)]
+      example.block = block
+    end
+  end
+end