1 files changed, 49 insertions, 0 deletions
diff --git a/test/ruby/test_pipe.rb b/test/ruby/test_pipe.rb
new file mode 100644
index 0000000000..9fa42fd375
--- /dev/null
+++ b/test/ruby/test_pipe.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: false
+require 'test/unit'
+require_relative 'ut_eof'
+
+class TestPipe < Test::Unit::TestCase
+  include TestEOF
+  def open_file(content)
+    r, w = IO.pipe
+    w << content
+    w.close
+    begin
+      yield r
+    ensure
+      r.close
+    end
+  end
+  class WithConversion < self
+    def open_file(content)
+      r, w = IO.pipe
+      w << content
+      w.close
+      r.set_encoding("us-ascii:utf-8")
+      begin
+        yield r
+      ensure
+        r.close
+      end
+    end
+  end
+
+  def test_stdout_epipe
+    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      io = STDOUT
+      begin
+        save = io.dup
+        IO.popen("echo", "w", out: IO::NULL) do |f|
+          io.reopen(f)
+          Process.wait(f.pid)
+          assert_raise(Errno::EPIPE) do
+            io.print "foo\n"
+          end
+        end
+      ensure
+        io.reopen(save)
+      end
+    end;
+  end
+end