add tests for empty writes, too

There could be some platforms that dislike it...

1 files changed, 8 insertions, 0 deletions

diff --git a/test/lib_read_write.rb b/test/lib_read_write.rb
index 20bdd59..b3c6f17 100644
--- a/test/lib_read_write.rb
+++ b/test/lib_read_write.rb
@@ -15,6 +15,14 @@ module LibReadWriteTest
     end
   end
 
+  def test_write_empty
+    assert_nil @wr.kgio_write("")
+  end
+
+  def test_trywrite_empty
+    assert_nil @wr.kgio_trywrite("")
+  end
+
   def test_read_zero
     assert_equal "", @rd.kgio_read(0)
     buf = "foo"