1 files changed, 20 insertions, 7 deletions
diff --git a/spec/ruby/core/io/shared/binwrite.rb b/spec/ruby/core/io/shared/binwrite.rb
index 1a88442a3b..e51093329b 100644
--- a/spec/ruby/core/io/shared/binwrite.rb
+++ b/spec/ruby/core/io/shared/binwrite.rb
@@ -21,12 +21,20 @@ describe :io_binwrite, shared: true do
     IO.send(@method, @filename, "abcde").should == 5
   end
 
+  it "accepts options as a keyword argument" do
+    IO.send(@method, @filename, "hi", 0, flags: File::CREAT).should == 2
+
+    -> {
+      IO.send(@method, @filename, "hi", 0, {flags: File::CREAT})
+    }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 2..3)")
+  end
+
   it "creates a file if missing" do
     fn = @filename + "xxx"
     begin
-      File.exist?(fn).should be_false
+      File.should_not.exist?(fn)
       IO.send(@method, fn, "test")
-      File.exist?(fn).should be_true
+      File.should.exist?(fn)
     ensure
       rm_r fn
     end
@@ -35,9 +43,9 @@ describe :io_binwrite, shared: true do
   it "creates file if missing even if offset given" do
     fn = @filename + "xxx"
     begin
-      File.exist?(fn).should be_false
+      File.should_not.exist?(fn)
       IO.send(@method, fn, "test", 0)
-      File.exist?(fn).should be_true
+      File.should.exist?(fn)
     ensure
       rm_r fn
     end
@@ -56,7 +64,7 @@ describe :io_binwrite, shared: true do
   end
 
   it "doesn't truncate and writes at the given offset after passing empty opts" do
-    IO.send(@method, @filename, "hello world!", 1, {})
+    IO.send(@method, @filename, "hello world!", 1, **{})
     File.read(@filename).should == "0hello world!34567890123456789"
   end
 
@@ -67,12 +75,17 @@ describe :io_binwrite, shared: true do
     File.read(@filename).should == "\0\0foo"
   end
 
+  it "accepts a :flags option without :mode one" do
+    IO.send(@method, @filename, "hello, world!", flags: File::CREAT)
+    File.read(@filename).should == "hello, world!"
+  end
+
   it "raises an error if readonly mode is specified" do
-    lambda { IO.send(@method, @filename, "abcde", mode: "r") }.should raise_error(IOError)
+    -> { IO.send(@method, @filename, "abcde", mode: "r") }.should raise_error(IOError)
   end
 
   it "truncates if empty :opts provided and offset skipped" do
-    IO.send(@method, @filename, "hello, world!", {})
+    IO.send(@method, @filename, "hello, world!", **{})
     File.read(@filename).should == "hello, world!"
   end
 end