Ticket #8209: Added regression test

Author: orbitcowboy

test/testcondition.cpp

@@ -4024,6 +4024,13 @@ class TestCondition : public TestFixture {
               "}\n");
         ASSERT_EQUALS("[test.cpp:3]: (style) Condition 'i<=18' is always true\n", errout.str());
 
+        // #8209
+        check("void f() {\n"
+              "    for(int x = 0; x < 3; ++x)\n"
+              "        if(x == -5) {}\n"
+              "}");
+        ASSERT_EQUALS("[test.cpp:3]: (style) Condition 'x==-5' is always false\n", errout.str());
+
         check("void f(unsigned int u1, unsigned int u2) {\n"
               "    if (u1 <= 10 && u2 >= 20) {\n"
               "        if (u1 != u2) {}\n"