Add tests for chomp

tests/stdlib/tstrutil.nim

@@ -10,8 +10,25 @@ import
 proc testStrip() =
   write(stdout, strip("  ha  "))
 
+proc testChomp =
+  assert "hello".chomp                == "hello"
+  assert "hello\n".chomp              == "hello"
+  assert "hello\r\n".chomp            == "hello"
+  assert "hello\n\r".chomp            == "hello\n"
+  assert "hello\n\n".chomp            == "hello\n"
+  assert "hello\r".chomp              == "hello"
+  assert "hello \n there".chomp       == "hello \n there"
+  assert "hello".chomp("llo")         == "he"
+  assert "hellos".chomp('s')          == "hello"
+  assert "hellos".chomp({'s','z'})    == "hello"
+  assert "hellos".chomp({'o','s'})    == "hello"
+  assert "hello\r\n\r\n".chomp("")    == "hello"
+  assert "hello\r\n\r\r\n".chomp("")  == "hello\r\n\r"
+  assert "hello\n\n\n\n\n".chomp("")  == "hello"
+
 proc main() =
   testStrip()
+  testChomp()
   for p in split("/home/a1:xyz:/usr/bin", {':'}):
     write(stdout, p)