diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index 2ce32a6c12..77958b6359 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -616,7 +616,7 @@ class TestPathname < Test::Unit::TestCase
   def test_kernel_open
     count = 0
     result = Kernel.open(Pathname.new(__FILE__)) {|f|
-      assert(File.identical?(__FILE__, f))
+      assert_file.identical?(__FILE__, f)
       count += 1
       2
     }
@@ -1298,18 +1298,18 @@ class TestPathname < Test::Unit::TestCase
   def test_mkdir
     with_tmpchdir('rubytest-pathname') {|dir|
       Pathname("d").mkdir
-      assert(File.directory?("d"))
+      assert_file.directory?("d")
       Pathname("e").mkdir(0770)
-      assert(File.directory?("e"))
+      assert_file.directory?("e")
     }
   end
 
   def test_rmdir
     with_tmpchdir('rubytest-pathname') {|dir|
       Pathname("d").mkdir
-      assert(File.directory?("d"))
+      assert_file.directory?("d")
       Pathname("d").rmdir
-      assert(!File.exist?("d"))
+      assert_file.not_exist?("d")
     }
   end
 
@@ -1372,16 +1372,16 @@ class TestPathname < Test::Unit::TestCase
   def test_mkpath
     with_tmpchdir('rubytest-pathname') {|dir|
       Pathname("a/b/c/d").mkpath
-      assert(File.directory?("a/b/c/d"))
+      assert_file.directory?("a/b/c/d")
     }
   end
 
   def test_rmtree
     with_tmpchdir('rubytest-pathname') {|dir|
       Pathname("a/b/c/d").mkpath
-      assert(File.exist?("a/b/c/d"))
+      assert_file.exist?("a/b/c/d")
       Pathname("a").rmtree
-      assert(!File.exist?("a"))
+      assert_file.not_exist?("a")
     }
   end
 
@@ -1389,10 +1389,10 @@ class TestPathname < Test::Unit::TestCase
     with_tmpchdir('rubytest-pathname') {|dir|
       open("f", "w") {|f| f.write "abc" }
       Pathname("f").unlink
-      assert(!File.exist?("f"))
+      assert_file.not_exist?("f")
       Dir.mkdir("d")
       Pathname("d").unlink
-      assert(!File.exist?("d"))
+      assert_file.not_exist?("d")
     }
   end
 
@@ -1417,7 +1417,7 @@ class TestPathname < Test::Unit::TestCase
   end
 
   def test_file_fnmatch
-    assert(File.fnmatch("*.*", Pathname.new("bar.baz")))
+    assert_file.fnmatch("*.*", Pathname.new("bar.baz"))
   end
 
   def test_relative_path_from_casefold