diff --git a/test/uri/test_common.rb b/test/uri/test_common.rb
index 77bdab6..1df19e6 100644
--- a/test/uri/test_common.rb
+++ b/test/uri/test_common.rb
@@ -3,10 +3,7 @@
 require 'envutil'
 require 'uri'
 
-module URI
-
-
-class TestCommon < Test::Unit::TestCase
+class URI::TestCommon < Test::Unit::TestCase
   def setup
   end
 
@@ -116,7 +113,7 @@ def test_parse_timeout
     pre = ->(n) {
       'https://example.com/dir/' + 'a' * (n * 100) + '/##.jpg'
     }
-    assert_linear_performance((1..10).map {|i| i * 100}, rehearsal: 1000, pre: pre) do |uri|
+    assert_linear_performance((1..3).map {|i| 10**i}, rehearsal: 1000, pre: pre) do |uri|
       assert_raise(URI::InvalidURIError) do
         URI.parse(uri)
       end
@@ -292,6 +289,3 @@ def test_decode_www_form
   private
   def s(str) str.force_encoding(Encoding::Windows_31J); end
 end
-
-
-end
diff --git a/test/uri/test_ftp.rb b/test/uri/test_ftp.rb
index 0eec984..f45bb06 100644
--- a/test/uri/test_ftp.rb
+++ b/test/uri/test_ftp.rb
@@ -2,10 +2,7 @@
 require 'test/unit'
 require 'uri/ftp'
 
-module URI
-
-
-class TestFTP < Test::Unit::TestCase
+class URI::TestFTP < Test::Unit::TestCase
   def setup
   end
 
@@ -29,7 +26,7 @@ def test_parse
   end
 
   def test_parse_invalid
-    assert_raise(InvalidURIError){URI.parse('ftp:example')}
+    assert_raise(URI::InvalidURIError) {URI.parse('ftp:example')}
   end
 
   def test_paths
@@ -62,6 +59,3 @@ def test_select
     end
   end
 end
-
-
-end
diff --git a/test/uri/test_http.rb b/test/uri/test_http.rb
index 748e90a..e937b1a 100644
--- a/test/uri/test_http.rb
+++ b/test/uri/test_http.rb
@@ -3,10 +3,7 @@
 require 'uri/http'
 require 'uri/https'
 
-module URI
-
-
-class TestHTTP < Test::Unit::TestCase
+class URI::TestHTTP < Test::Unit::TestCase
   def setup
   end
 
@@ -82,6 +79,3 @@ def test_origin
     assert_equal('https://a.b.c', URI.parse('https://a.b.c/').origin)
   end
 end
-
-
-end
diff --git a/test/uri/test_ldap.rb b/test/uri/test_ldap.rb
index 2625b24..9c4506a 100644
--- a/test/uri/test_ldap.rb
+++ b/test/uri/test_ldap.rb
@@ -2,10 +2,7 @@
 require 'test/unit'
 require 'uri/ldap'
 
-module URI
-
-
-class TestLDAP < Test::Unit::TestCase
+class URI::TestLDAP < Test::Unit::TestCase
   def setup
   end
 
@@ -100,6 +97,3 @@ def test_parse_invalid_uri
     assert_raise(URI::InvalidURIError) {URI.parse("ldap:https://example.com")}
   end
 end
-
-
-end
diff --git a/test/uri/test_ws.rb b/test/uri/test_ws.rb
index 17acb0d..f3918f6 100644
--- a/test/uri/test_ws.rb
+++ b/test/uri/test_ws.rb
@@ -3,10 +3,7 @@
 require 'uri/http'
 require 'uri/ws'
 
-module URI
-
-
-class TestWS < Test::Unit::TestCase
+class URI::TestWS < Test::Unit::TestCase
   def setup
   end
 
@@ -66,6 +63,3 @@ def test_select
     end
   end
 end
-
-
-end
diff --git a/test/uri/test_wss.rb b/test/uri/test_wss.rb
index 2e8b9bc..13a2583 100644
--- a/test/uri/test_wss.rb
+++ b/test/uri/test_wss.rb
@@ -3,10 +3,7 @@
 require 'uri/https'
 require 'uri/wss'
 
-module URI
-
-
-class TestWSS < Test::Unit::TestCase
+class URI::TestWSS < Test::Unit::TestCase
   def setup
   end
 
@@ -66,6 +63,3 @@ def test_select
     end
   end
 end
-
-
-end