add singleton methods for non-Kgio objects

This allows people to more easily use Kgio in existing apps.

1 files changed, 21 insertions, 0 deletions

diff --git a/test/test_singleton_read_write.rb b/test/test_singleton_read_write.rb
new file mode 100644
index 0000000..5abbf00
--- /dev/null
+++ b/test/test_singleton_read_write.rb
@@ -0,0 +1,21 @@
+require 'test/unit'
+$-w = true
+require 'kgio'
+
+class TestSingletonReadWrite < Test::Unit::TestCase
+
+  def test_unix_socketpair
+    a, b = UNIXSocket.pair
+    assert_nothing_raised { Kgio.trywrite(a, "HELLO") }
+    buf = ""
+    assert_equal "HELLO", Kgio.tryread(b, 5, buf)
+    assert_equal "HELLO", buf
+    assert_equal :wait_readable, Kgio.tryread(b, 5)
+  end
+
+  def test_arg_error
+    assert_raises(ArgumentError) { Kgio.tryread }
+    assert_raises(ArgumentError) { Kgio.tryread($stdin) }
+    assert_raises(ArgumentError) { Kgio.trywrite($stdout) }
+  end
+end