1 files changed, 138 insertions, 0 deletions
diff --git a/spec/ruby/core/io/lineno_spec.rb b/spec/ruby/core/io/lineno_spec.rb
new file mode 100644
index 0000000000..93b505652a
--- /dev/null
+++ b/spec/ruby/core/io/lineno_spec.rb
@@ -0,0 +1,138 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "IO#lineno" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  it "raises an IOError on a closed stream" do
+    -> { 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
+    @io.lineno.should == 0
+
+    count = 0
+    while @io.gets
+      @io.lineno.should == count += 1
+    end
+
+    @io.rewind
+    @io.lineno.should == 0
+  end
+end
+
+describe "IO#lineno=" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  it "raises an IOError on a closed stream" do
+    -> { 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
+    obj = mock('123')
+    obj.should_receive(:to_int).and_return(123)
+
+    @io.lineno = obj
+    @io.lineno.should == 123
+  end
+
+  it "truncates a Float argument" do
+    @io.lineno = 1.5
+    @io.lineno.should == 1
+
+    @io.lineno = 92233.72036854775808
+    @io.lineno.should == 92233
+  end
+
+  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
+    @io.lineno = count = 500
+
+    while @io.gets
+      @io.lineno.should == count += 1
+    end
+
+    @io.rewind
+    @io.lineno.should == 0
+  end
+
+  it "does not change $." do
+    original_line = $.
+    numbers = [-2**30, -2**16, -2**8, -100, -10, -1, 0, 1, 10, 2**8, 2**16, 2**30]
+    numbers.each do |num|
+      @io.lineno = num
+      @io.lineno.should == num
+      $..should == original_line
+    end
+  end
+
+  it "does not change $. until next read" do
+    $. = 0
+    $..should == 0
+
+    @io.lineno = count = 500
+    $..should == 0
+
+    while @io.gets
+      $..should == count += 1
+    end
+  end
+end