Fixed printability of largest negative value (Thanks SigmaPic!)

src/unity.c

@@ -125,12 +125,18 @@ void UnityPrintNumber(const _U_SINT number_to_print)
 {
     _U_SINT divisor = 1;
     _U_SINT next_divisor;
-    _U_SINT number = number_to_print;
 
-    if (number < 0)
+    _U_UINT number;
+
+    if (number_to_print < 0)
     {
         UNITY_OUTPUT_CHAR('-');
-        number = -number;
+        number = -number_to_print;
+    }
+    else
+    {
+        number = number_to_print;
+
     }
 
     // figure out initial divisor

test/tests/testunity.c

@@ -218,7 +218,7 @@ void testNotEqualInt16s(void)
 void testNotEqualInt32s(void)
 {
     EXPECT_ABORT_BEGIN
-    TEST_ASSERT_EQUAL_INT32(-2147483647, -2147483646);
+    TEST_ASSERT_EQUAL_INT32(-2147483647, -2147483648); //use largest 32 bit negative to test printability
     VERIFY_FAILS_END
 }