Tidy up fiber scheduler tests.

Merged: https://github.com/ruby/ruby/pull/15712

test/fiber/scheduler.rb

@@ -489,15 +489,19 @@ class IOBufferScheduler < Scheduler
 end
 
 class IOScheduler < Scheduler
-  def __io_ops__
-    @__io_ops__ ||= []
+  def operations
+    @operations ||= []
   end
 
   def io_write(io, buffer, length, offset)
-    fd = io.fileno
-    str = buffer.get_string
-    __io_ops__ << [:io_write, fd, str]
-    Fiber.blocking { buffer.write(io, 0, offset) }
+    descriptor = io.fileno
+    string = buffer.get_string
+
+    self.operations << [:io_write, descriptor, string]
+
+    Fiber.blocking do
+      buffer.write(io, 0, offset)
+    end
   end
 end
 

test/fiber/test_scheduler.rb

@@ -288,90 +288,99 @@ class TestFiberScheduler < Test::Unit::TestCase
 
   def test_io_write_on_flush
     begin
-      fn = File.join(Dir.tmpdir, "ruby_test_io_write_on_flush_#{SecureRandom.hex}")
-      write_fd = nil
-      io_ops = nil
+      path = File.join(Dir.tmpdir, "ruby_test_io_write_on_flush_#{SecureRandom.hex}")
+      descriptor = nil
+      operations = nil
+
       thread = Thread.new do
         scheduler = IOScheduler.new
         Fiber.set_scheduler scheduler
 
         Fiber.schedule do
-          File.open(fn, 'w+') do |f|
-            write_fd = f.fileno
-            f << 'foo'
-            f.flush
-            f << 'bar'
+          File.open(path, 'w+') do |file|
+            descriptor = file.fileno
+            file << 'foo'
+            file.flush
+            file << 'bar'
           end
         end
-        io_ops = scheduler.__io_ops__
+
+        operations = scheduler.operations
       end
+
       thread.join
       assert_equal [
-        [:io_write, write_fd, 'foo'],
-        [:io_write, write_fd, 'bar']
-      ], io_ops
+        [:io_write, descriptor, 'foo'],
+        [:io_write, descriptor, 'bar']
+      ], operations
 
-      assert_equal 'foobar', IO.read(fn)
+      assert_equal 'foobar', IO.read(path)
     ensure
       thread.kill rescue nil
-      FileUtils.rm_f(fn)
+      FileUtils.rm_f(path)
     end
   end
 
   def test_io_read_error
-    fn = File.join(Dir.tmpdir, "ruby_test_io_read_error_#{SecureRandom.hex}")
-    exception = nil
+    path = File.join(Dir.tmpdir, "ruby_test_io_read_error_#{SecureRandom.hex}")
+    error = nil
+
     thread = Thread.new do
       scheduler = IOErrorScheduler.new
       Fiber.set_scheduler scheduler
       Fiber.schedule do
-        File.open(fn, 'w+') { it.read }
-      rescue => e
-        exception = e
+        File.open(path, 'w+') { it.read }
+      rescue => error
+        # Ignore.
       end
     end
+
     thread.join
-    assert_kind_of Errno::EBADF, exception
+    assert_kind_of Errno::EBADF, error
   ensure
     thread.kill rescue nil
-    FileUtils.rm_f(fn)
+    FileUtils.rm_f(path)
   end
 
   def test_io_write_error
-    fn = File.join(Dir.tmpdir, "ruby_test_io_write_error_#{SecureRandom.hex}")
-    exception = nil
+    path = File.join(Dir.tmpdir, "ruby_test_io_write_error_#{SecureRandom.hex}")
+    error = nil
+
     thread = Thread.new do
       scheduler = IOErrorScheduler.new
       Fiber.set_scheduler scheduler
       Fiber.schedule do
-        File.open(fn, 'w+') { it.sync = true; it << 'foo' }
-      rescue => e
-        exception = e
+        File.open(path, 'w+') { it.sync = true; it << 'foo' }
+      rescue => error
+        # Ignore.
       end
     end
+
     thread.join
-    assert_kind_of Errno::EINVAL, exception
+    assert_kind_of Errno::EINVAL, error
   ensure
     thread.kill rescue nil
-    FileUtils.rm_f(fn)
+    FileUtils.rm_f(path)
   end
 
   def test_io_write_flush_error
-    fn = File.join(Dir.tmpdir, "ruby_test_io_write_flush_error_#{SecureRandom.hex}")
-    exception = nil
+    path = File.join(Dir.tmpdir, "ruby_test_io_write_flush_error_#{SecureRandom.hex}")
+    error = nil
+
     thread = Thread.new do
       scheduler = IOErrorScheduler.new
       Fiber.set_scheduler scheduler
       Fiber.schedule do
-        File.open(fn, 'w+') { it << 'foo' }
-      rescue => e
-        exception = e
+        File.open(path, 'w+') { it << 'foo' }
+      rescue => error
+        # Ignore.
       end
     end
+
     thread.join
-    assert_kind_of Errno::EINVAL, exception
+    assert_kind_of Errno::EINVAL, error
   ensure
     thread.kill rescue nil
-    FileUtils.rm_f(fn)
+    FileUtils.rm_f(path)
   end
 end