add test

Author: ludviggunne

test/testother.cpp

@@ -195,6 +195,7 @@ class TestOther : public TestFixture {
         TEST_CASE(duplicateExpression16); // #10569
         TEST_CASE(duplicateExpression17); // #12036
         TEST_CASE(duplicateExpression18);
+        TEST_CASE(duplicateExpression19);
         TEST_CASE(duplicateExpressionLoop);
         TEST_CASE(duplicateValueTernary);
         TEST_CASE(duplicateValueTernarySizeof); // #13773
@@ -7988,6 +7989,14 @@ class TestOther : public TestFixture {
         ASSERT_EQUALS("", errout_str());
     }
 
+    void duplicateExpression19() {
+        checkP("const int i = 0;\n"
+               "void f() {\n"
+               "    assert(i == 0);\n"
+               "}\n");
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void duplicateExpressionLoop() {
         check("void f() {\n"
               "    int a = 1;\n"