Move union size test to separate test case

Author: kornilova203

tests/samples/src/test/scala/org/scalanative/bindgen/samples/UnionTests.scala

@@ -8,14 +8,16 @@ object UnionTests extends TestSuite {
   val tests = Tests {
     'getValues - {
       Zone {implicit zone =>
-        val structPtr = alloc[Union.union_values]
-        Union.setIntValue(structPtr)
-        assert(!structPtr.i == 10)
-        Union.setLongValue(structPtr)
-        assert(!structPtr.l == 10000000000L)
-
-        assert(Union.getUnionSize() == sizeof[Union.union_values])
+        val unionPtr = alloc[Union.union_values]
+        Union.setIntValue(unionPtr)
+        assert(!unionPtr.i == 10)
+        Union.setLongValue(unionPtr)
+        assert(!unionPtr.l == 10000000000L)
       }
     }
+
+    'unionSize - {
+      assert(Union.getUnionSize() == sizeof[Union.union_values])
+    }
   }
 }