1 files changed, 9 insertions, 19 deletions
diff --git a/spec/ruby/core/io/ungetbyte_spec.rb b/spec/ruby/core/io/ungetbyte_spec.rb
index b7de1b7a6d..e0615cd76c 100644
--- a/spec/ruby/core/io/ungetbyte_spec.rb
+++ b/spec/ruby/core/io/ungetbyte_spec.rb
@@ -13,12 +13,12 @@ describe "IO#ungetbyte" do
   end
 
   it "does nothing when passed nil" do
-    @io.ungetbyte(nil).should be_nil
+    @io.ungetbyte(nil).should == nil
     @io.getbyte.should == 97
   end
 
   it "puts back each byte in a String argument" do
-    @io.ungetbyte("cat").should be_nil
+    @io.ungetbyte("cat").should == nil
     @io.getbyte.should == 99
     @io.getbyte.should == 97
     @io.getbyte.should == 116
@@ -29,36 +29,26 @@ describe "IO#ungetbyte" do
     str = mock("io ungetbyte")
     str.should_receive(:to_str).and_return("dog")
 
-    @io.ungetbyte(str).should be_nil
+    @io.ungetbyte(str).should == nil
     @io.getbyte.should == 100
     @io.getbyte.should == 111
     @io.getbyte.should == 103
     @io.getbyte.should == 97
   end
 
-  ruby_version_is ''...'2.6' do
-    it "puts back one byte for a Fixnum argument..." do
-      @io.ungetbyte(4095).should be_nil
+  it "never raises RangeError" do
+    for i in [4095, 0x4f7574206f6620636861722072616e67ff] do
+      @io.ungetbyte(i).should == nil
       @io.getbyte.should == 255
     end
-
-    it "... but not for Bignum argument (eh?)" do
-      lambda {
-        @io.ungetbyte(0x4f7574206f6620636861722072616e6765)
-      }.should raise_error(TypeError)
-    end
   end
 
-  ruby_version_is '2.6' do
-    it "is an RangeError if the integr is not in 8bit" do
-      for i in [4095, 0x4f7574206f6620636861722072616e6765] do
-        lambda { @io.ungetbyte(i) }.should raise_error(RangeError)
-      end
-    end
+  it "raises IOError on stream not opened for reading" do
+    -> { STDOUT.ungetbyte(42) }.should.raise(IOError, "not opened for reading")
   end
 
   it "raises an IOError if the IO is closed" do
     @io.close
-    lambda { @io.ungetbyte(42) }.should raise_error(IOError)
+    -> { @io.ungetbyte(42) }.should.raise(IOError)
   end
 end