Removed trailing spaces [ci skip]

test/csv/test_table.rb

@@ -16,7 +16,7 @@ class TestCSVTable < Test::Unit::TestCase
     @header_table = CSV::Table.new(
       [CSV::Row.new(%w{A B C}, %w{A B C}, true)] + @rows
     )
-    
+
     @header_only_table = CSV::Table.new([], headers: %w{A B C})
   end
 

test/ruby/test_stack.rb

@@ -52,13 +52,13 @@ class TestStack < Test::Unit::TestCase
 
   def test_vm_stack_size
     script = '$stdout.sync=true; def rec; print "."; rec; end; Fiber.new{rec}.resume'
-    
+
     size_default = invoke_ruby(script).bytesize
     assert_operator(size_default, :>, 0)
-    
+
     size_0 = invoke_ruby(script, vm_stack_size: 0).bytesize
     assert_operator(size_default, :>, size_0)
-    
+
     size_large = invoke_ruby(script, vm_stack_size: LARGE_VM_STACK_SIZE).bytesize
     assert_operator(size_default, :<, size_large)
   end

test/scheduler/test_mutex.rb

@@ -36,7 +36,7 @@ class TestSchedulerMutex < Test::Unit::TestCase
           Fiber.yield
         end
       end
-      
+
       assert_raise ThreadError do
         mutex.lock
       end