1 files changed, 49 insertions, 6 deletions
diff --git a/spec/ruby/core/io/lineno_spec.rb b/spec/ruby/core/io/lineno_spec.rb
index 4fddbf135c..93b505652a 100644
--- a/spec/ruby/core/io/lineno_spec.rb
+++ b/spec/ruby/core/io/lineno_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "IO#lineno" do
   before :each do
@@ -11,7 +11,26 @@ describe "IO#lineno" do
   end
 
   it "raises an IOError on a closed stream" do
-    lambda { IOSpecs.closed_io.lineno }.should raise_error(IOError)
+    -> { IOSpecs.closed_io.lineno }.should.raise(IOError)
+  end
+
+  it "raises an IOError on a write-only stream" do
+    name = tmp("io_lineno.txt")
+    begin
+      File.open(name, 'w') do |f|
+        -> { f.lineno }.should.raise(IOError)
+      end
+    ensure
+      rm_r name
+    end
+  end
+
+  it "raises an IOError on a duplexed stream with the read side closed" do
+    cmd = platform_is(:windows) ? 'rem' : 'cat'
+    IO.popen(cmd, 'r+') do |p|
+      p.close_read
+      -> { p.lineno }.should.raise(IOError)
+    end
   end
 
   it "returns the current line number" do
@@ -37,7 +56,26 @@ describe "IO#lineno=" do
   end
 
   it "raises an IOError on a closed stream" do
-    lambda { IOSpecs.closed_io.lineno = 5 }.should raise_error(IOError)
+    -> { IOSpecs.closed_io.lineno = 5 }.should.raise(IOError)
+  end
+
+  it "raises an IOError on a write-only stream" do
+    name = tmp("io_lineno.txt")
+    begin
+      File.open(name, 'w') do |f|
+        -> { f.lineno = 0 }.should.raise(IOError)
+      end
+    ensure
+      rm_r name
+    end
+  end
+
+  it "raises an IOError on a duplexed stream with the read side closed" do
+    cmd = platform_is(:windows) ? 'rem' : 'cat'
+    IO.popen(cmd, 'r+') do |p|
+      p.close_read
+      -> { p.lineno = 0 }.should.raise(IOError)
+    end
   end
 
   it "calls #to_int on a non-numeric argument" do
@@ -56,8 +94,13 @@ describe "IO#lineno=" do
     @io.lineno.should == 92233
   end
 
-  it "raises TypeError on nil argument" do
-    lambda { @io.lineno = nil }.should raise_error(TypeError)
+  it "raises TypeError if cannot convert argument to Integer implicitly" do
+    -> { @io.lineno = "1" }.should.raise(TypeError, 'no implicit conversion of String into Integer')
+    -> { @io.lineno = nil }.should raise_consistent_error(TypeError, 'no implicit conversion of nil into Integer')
+  end
+
+  it "does not accept Integers that don't fit in a C int" do
+    -> { @io.lineno = 2**32 }.should.raise(RangeError)
   end
 
   it "sets the current line number to the given value" do