Add tests using arithmetic on negative integers.

diff --git a/tests/expr/basic b/tests/expr/basic
index 79ff566..c5a843d 100755 (executable)
--- a/tests/expr/basic
+++ b/tests/expr/basic
@@ -29,6 +29,8 @@ my @Tests =
      ['c', '5 \* 6', {OUT => '30'}],
      ['d', '100 / 6', {OUT => '16'}],
      ['e', '100 % 6', {OUT => '4'}],
+     ['f', '3 + -2', {OUT => '1'}],
+     ['g', '-2 + -2', {OUT => '-4'}],
 
      ['paren1', '\( 100 % 6 \)', {OUT => '4'}],
      ['paren2', '\( 100 % 6 \) - 8', {OUT => '-4'}],