1 files changed, 11 insertions, 5 deletions
diff --git a/spec/ruby/core/io/shared/pos.rb b/spec/ruby/core/io/shared/pos.rb
index fef7ab2bf7..f4d0405863 100644
--- a/spec/ruby/core/io/shared/pos.rb
+++ b/spec/ruby/core/io/shared/pos.rb
@@ -19,7 +19,7 @@ describe :io_pos, shared: true do
   end
 
   it "raises IOError on closed stream" do
-    lambda { IOSpecs.closed_io.send(@method) }.should raise_error(IOError)
+    -> { IOSpecs.closed_io.send(@method) }.should.raise(IOError)
   end
 
   it "resets #eof?" do
@@ -27,7 +27,7 @@ describe :io_pos, shared: true do
       io.read 1
       io.read 1
       io.send(@method)
-      io.eof?.should == false
+      io.should_not.eof?
     end
   end
 end
@@ -60,13 +60,19 @@ describe :io_set_pos, shared: true do
     end
   end
 
-  it "does not accept Bignums that don't fit in a C long" do
+  it "raises TypeError when cannot convert implicitly argument to Integer" do
     File.open @fname do |io|
-      lambda { io.send @method, 2**128 }.should raise_error(RangeError)
+      -> { io.send @method, Object.new }.should.raise(TypeError, "no implicit conversion of Object into Integer")
+    end
+  end
+
+  it "does not accept Integers that don't fit in a C off_t" do
+    File.open @fname do |io|
+      -> { io.send @method, 2**128 }.should.raise(RangeError)
     end
   end
 
   it "raises IOError on closed stream" do
-    lambda { IOSpecs.closed_io.send @method, 0 }.should raise_error(IOError)
+    -> { IOSpecs.closed_io.send @method, 0 }.should.raise(IOError)
   end
 end