Make it work on older MiniTest versions.

Fixes #26.

README.md

@@ -32,10 +32,6 @@ The following reporters are provided:
     MiniTest::Reporters::RubyMineReporter # => Reporter designed for RubyMine IDE and TeamCity CI server; see below
     MiniTest::Reporters::GuardReporter    # => Integrates with guard-minitest to provide on-screen notifications
 
-## TODO ##
-
-* Add some example images of the reporters.
-
 ## Note on Patches/Pull Requests ##
 
 * Fork the project.

lib/minitest/before_test_hook.rb

@@ -1,12 +1,15 @@
 module MiniTest
   module BeforeTestHook
-    def before_setup
+    def self.before_test(instance)
       runner = MiniTest::Unit.runner
 
       if runner.respond_to?(:before_test)
-        runner.before_test(self.class, __name__)
+        runner.before_test(instance.class, instance.__name__)
       end
+    end
 
+    def before_setup
+      BeforeTestHook.before_test(self)
       super
     end
   end

lib/minitest/reporters.rb

@@ -26,7 +26,13 @@ def self.use!(console_reporters = ProgressReporter.new, env = ENV)
     end
 
     def self.include_hook!
-      Unit::TestCase.send(:include, BeforeTestHook)
+      if Unit::VERSION >= "3.3.0"
+        Unit::TestCase.send(:include, BeforeTestHook)
+      else
+        Unit::TestCase.send(:define_method, :before_setup) do
+          BeforeTestHook.before_test(self)
+        end
+      end
     end
 
     def self.choose_reporters(console_reporters, env)

minitest-reporters.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
 
   s.rubyforge_project = 'minitest-reporters'
 
-  s.add_dependency 'minitest', '>= 2.0', '< 4.0'
+  s.add_dependency 'minitest', '>= 2.12', '< 4.0'
   s.add_dependency 'ansi'
   s.add_dependency 'powerbar'
   s.add_dependency 'builder'

test/minitest/backtrace_filter_test.rb

@@ -1,29 +1,25 @@
 require "test_helper"
 
 module MiniTestReportersTest
-  class BacktraceFilterTest < MiniTest::Unit::TestCase
+  class BacktraceFilterTest < TestCase
     def setup
       @default_filter = MiniTest::BacktraceFilter.default_filter
       @filter = MiniTest::BacktraceFilter.new
       @backtrace = ["foo", "bar", "baz"]
     end
 
     def test_adding_filters
-      skip "test"
       @filter.add_filter(/foo/)
       assert @filter.filters?("foo")
       refute @filter.filters?("baz")
     end
 
     def test_filter_backtrace_when_first_line_is_filtered
-      sleep 5
-      assert false
       @filter.add_filter(/foo/)
       assert_equal ["bar", "baz"], @filter.filter(@backtrace)
     end
 
     def test_filter_backtrace_when_middle_line_is_filtered
-      raise "foo"
       @filter.add_filter(/bar/)
       assert_equal ["foo"], @filter.filter(@backtrace)
     end