diff --git a/spec/helpers/spy_formatter.cr b/spec/helpers/spy_formatter.cr
index 47de502..9afc644 100644
--- a/spec/helpers/spy_formatter.cr
+++ b/spec/helpers/spy_formatter.cr
@@ -3,7 +3,6 @@
 class SpyFormatter < Spectator::Formatting::Formatter
   {% for item in [
                    {"start_suite", "Spectator::TestSuite"},
-                   {"end_suite", "Spectator::Report"},
                    {"start_example", "Spectator::Example"},
                    {"end_example", "Spectator::Result"},
                  ] %}
@@ -27,6 +26,21 @@ class SpyFormatter < Spectator::Formatting::Formatter
 
   {% end %}
 
+  # Stores all invocatiosn made to `#end_suite`.
+  # Each element is an invocation and the value is the arguments passed to the method.
+  getter end_suite_calls = [] of NamedTuple(report: Spectator::Report, profile: Bool)
+
+  # Number of times the `#end_suite` method was called.
+  def end_suite_call_count
+    @end_suite_calls.size
+  end
+
+  # Increments `#end_suite_call_count` and stores the arguments.
+  def end_suite(report, profile)
+    @all_calls << :end_suite
+    @end_suite_calls << {report: report, profile: profile}
+  end
+
   # Stores the methods that were called and in which order.
   # The symbols will be the method name (i.e. `:start_suite`).
   getter all_calls = [] of Symbol
diff --git a/spec/runner_spec.cr b/spec/runner_spec.cr
index a20e15a..1fa678b 100644
--- a/spec/runner_spec.cr
+++ b/spec/runner_spec.cr
@@ -49,8 +49,8 @@ describe Spectator::Runner do
           suite = new_test_suite(group)
           runner = Spectator::Runner.new(suite, spectator_test_config(spy, true))
           runner.run
-          report = spy.end_suite_calls.first
-          report.remaining_count.should eq(3)
+          args = spy.end_suite_calls.first
+          args[:report].remaining_count.should eq(3)
         end
       end
     end
@@ -164,7 +164,8 @@ describe Spectator::Runner do
         spy = SpyFormatter.new
         runner = Spectator::Runner.new(suite, spectator_test_config(spy))
         runner.run
-        spy.end_example_calls.each_with_index do |result, index|
+        args = spy.end_suite_calls.first
+        args[:report].each_with_index do |result, index|
           if index.odd?
             result.should be_a(Spectator::SuccessfulResult)
           else
@@ -180,7 +181,8 @@ describe Spectator::Runner do
         runner = Spectator::Runner.new(suite, spectator_test_config(spy))
         max_time = Time.measure { runner.run }
         min_time = spy.end_example_calls.each.map(&.as(Spectator::FinishedResult)).sum(&.elapsed)
-        report = spy.end_suite_calls.first
+        args = spy.end_suite_calls.first
+        report = args[:report]
         report.runtime.should be <= max_time
         report.runtime.should be >= min_time
       end
diff --git a/src/spectator/formatting/formatter.cr b/src/spectator/formatting/formatter.cr
index 9696ccb..ab85900 100644
--- a/src/spectator/formatting/formatter.cr
+++ b/src/spectator/formatting/formatter.cr
@@ -14,7 +14,8 @@ module Spectator::Formatting
 
     # Called when a test suite finishes.
     # The results from the entire suite are provided.
-    abstract def end_suite(report : Report)
+    # The *profile* flag is set to true when profiling results should be generated.
+    abstract def end_suite(report : Report, profile : Bool)
 
     # Called before a test starts.
     abstract def start_example(example : Example)
diff --git a/src/spectator/formatting/json_formatter.cr b/src/spectator/formatting/json_formatter.cr
index 36e739f..6ab4d7f 100644
--- a/src/spectator/formatting/json_formatter.cr
+++ b/src/spectator/formatting/json_formatter.cr
@@ -20,10 +20,12 @@ module Spectator::Formatting
 
     # Called when a test suite finishes.
     # The results from the entire suite are provided.
-    def end_suite(report : Report)
+    # The *profile* flag is set to true when profiling results should be generated.
+    def end_suite(report : Report, profile : Bool)
       @json.end_array # examples
       totals(report)
       timing(report)
+      profile(report) if profile
       @json.field("result", report.failed? ? "fail" : "success")
       @json.end_object
     end
@@ -62,5 +64,10 @@ module Spectator::Formatting
         end
       end
     end
+
+    # Adds the profile information to the document.
+    private def profile(report)
+      raise NotImplementedError.new("profile")
+    end
   end
 end
diff --git a/src/spectator/formatting/junit_formatter.cr b/src/spectator/formatting/junit_formatter.cr
index a5ff115..3215006 100644
--- a/src/spectator/formatting/junit_formatter.cr
+++ b/src/spectator/formatting/junit_formatter.cr
@@ -24,7 +24,8 @@ module Spectator::Formatting
 
     # Called when a test suite finishes.
     # The results from the entire suite are provided.
-    def end_suite(report : Report)
+    # The *profile* flag does nothing for this formatter.
+    def end_suite(report : Report, profile : Bool)
       test_suites_block(report)
       @xml.end_document
       @xml.flush
diff --git a/src/spectator/formatting/silent_formatter.cr b/src/spectator/formatting/silent_formatter.cr
index b9e2eb2..eaf3464 100644
--- a/src/spectator/formatting/silent_formatter.cr
+++ b/src/spectator/formatting/silent_formatter.cr
@@ -9,7 +9,7 @@ module Spectator::Formatting
 
     # Called when a test suite finishes.
     # The results from the entire suite are provided.
-    def end_suite(report : Report)
+    def end_suite(report : Report, profile : Bool)
       # ... crickets ...
     end
 
diff --git a/src/spectator/formatting/suite_summary.cr b/src/spectator/formatting/suite_summary.cr
index b9efb7f..c0e2e2e 100644
--- a/src/spectator/formatting/suite_summary.cr
+++ b/src/spectator/formatting/suite_summary.cr
@@ -9,12 +9,14 @@ module Spectator::Formatting
     # Produces the summary of test suite from a report.
     # A block describing each failure is displayed.
     # At the end, the totals and runtime are printed.
-    def end_suite(report)
+    # The *profile* flag is set to true when profiling results should be generated.
+    def end_suite(report, profile : Bool)
       if report.example_count > 0
         @io.puts if is_a?(DotsFormatter)
         @io.puts
       end
       failures(report.failures) if report.failed_count > 0
+      profile(report) if profile
       stats(report)
       remaining(report) if report.remaining?
       if report.failed?
@@ -36,6 +38,11 @@ module Spectator::Formatting
       end
     end
 
+    # Produces the profiling section of the summary.
+    private def profile(report)
+      raise NotImplementedError.new("profile")
+    end
+
     # Produces the statistical section of the summary.
     # This contains how long the suite took to run
     # and the counts for the results (total, failures, errors, and pending).
diff --git a/src/spectator/formatting/tap_formatter.cr b/src/spectator/formatting/tap_formatter.cr
index 2a832de..eee6156 100644
--- a/src/spectator/formatting/tap_formatter.cr
+++ b/src/spectator/formatting/tap_formatter.cr
@@ -16,8 +16,9 @@ module Spectator::Formatting
 
     # Called when a test suite finishes.
     # The results from the entire suite are provided.
-    def end_suite(report : Report)
+    def end_suite(report : Report, profile : Bool)
       @io.puts "Bail out!" if report.remaining?
+      profile(report) if profile
     end
 
     # Called before a test starts.
@@ -30,5 +31,10 @@ module Spectator::Formatting
       @io.puts TAPTestLine.new(@index, result)
       @index += 1
     end
+
+    # Generates profiling information for the report.
+    private def profile(report)
+      raise NotImplementedError.new("profile")
+    end
   end
 end
diff --git a/src/spectator/runner.cr b/src/spectator/runner.cr
index 21802f0..ca5942f 100644
--- a/src/spectator/runner.cr
+++ b/src/spectator/runner.cr
@@ -24,7 +24,7 @@ module Spectator
       # Generate a report and pass it along to the formatter.
       remaining = @suite.size - results.size
       report = Report.new(results, elapsed, remaining, @config.fail_blank?)
-      @config.each_formatter(&.end_suite(report))
+      @config.each_formatter(&.end_suite(report, false)) # TODO: Profile flag.
 
       !report.failed?
     end