[gnome-calculator] Added simple test for constant negative conversion

[Robert Roth <robertroth src gnome org>]

commit 196ac232ffc80d9829c706ed13ba02cb3ca03130
Author: Robert Roth <robert roth off gmail com>
Date:   Mon Feb 13 22:47:53 2017 +0200

    Added simple test for constant negative conversion

 tests/test-equation.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/tests/test-equation.vala b/tests/test-equation.vala
index 8c663de..e9ccbf2 100644
--- a/tests/test-equation.vala
+++ b/tests/test-equation.vala
@@ -158,6 +158,7 @@ private void test_conversions ()
     test ("0degC in degF", "32", 0);
     test ("0 K in degC", "−273.15", 0);
     test ("0 k in c", "−273.15", 0);
+    test ("-1 c in k", "272.15", 0);
 
     /* Digital Storage */
     test ("1000 bits in bytes", "125", 0);