diff --git a/src/spectator.cr b/src/spectator.cr
index 81a13cf..7fb2aa6 100644
--- a/src/spectator.cr
+++ b/src/spectator.cr
@@ -76,7 +76,8 @@ module Spectator
   private def self.run
     # Build the root-level example group and run it.
     group = ::Spectator::DSL::Builder.build
-    Runner.new(group).run
+    suite = ::Spectator::TestSuite.new(group)
+    Runner.new(suite).run
   rescue ex
     # Catch all unhandled exceptions here.
     # Examples are already wrapped, so any exceptions they throw are caught.
diff --git a/src/spectator/runner.cr b/src/spectator/runner.cr
index 9908012..569a880 100644
--- a/src/spectator/runner.cr
+++ b/src/spectator/runner.cr
@@ -1,23 +1,26 @@
 module Spectator
   # Main driver for executing tests and feeding results to formatters.
   class Runner
-    def initialize(@group : ExampleGroup,
+    def initialize(@suite : TestSuite,
                    @formatter : Formatters::Formatter = Formatters::DefaultFormatter.new)
     end
 
     def run : Nil
-      iterator = ExampleIterator.new(@group)
       results = [] of Result
+      @formatter.start_suite
       elapsed = Time.measure do
-        @formatter.start_suite
-        results = iterator.map do |example|
-          @formatter.start_example(example)
-          Internals::Harness.run(example).tap do |result|
-            @formatter.end_example(result)
-          end.as(Result)
-        end.to_a
+        results = @suite.map do |example|
+          run_example(example)
+        end
       end
       @formatter.end_suite(TestSuiteResults.new(results, elapsed))
     end
+
+    private def run_example(example)
+      @formatter.start_example(example)
+      result = Internals::Harness.run(example)
+      @formatter.end_example(result)
+      result
+    end
   end
 end
diff --git a/src/spectator/test_suite.cr b/src/spectator/test_suite.cr
index 7c1f4b0..8d973b9 100644
--- a/src/spectator/test_suite.cr
+++ b/src/spectator/test_suite.cr
@@ -1,5 +1,19 @@
 module Spectator
   # Encapsulates the tests to run and additional properties about them.
   class TestSuite
+    include Enumerable(Example)
+
+    def initialize(@group : ExampleGroup)
+    end
+
+    def each
+      iterator.each do |example|
+        yield example
+      end
+    end
+
+    private def iterator
+      ExampleIterator.new(@group)
+    end
   end
 end