Merge #14088: tests: Don't assert(...) with side effects

ca1a093127 Add regression test: Don't assert(...) with side effects (practicalswift)
4c3c9c3869 Don't assert(...) with side effects (practicalswift)

Pull request description:

  Don't `assert(...)` with side effects.

  From the developer notes:

  > **Assertions should not have side-effects**
  >
  > Rationale: Even though the source code is set to refuse to compile with assertions disabled, having side-effects in assertions is unexpected and makes the code harder to understand

  These assertions were introduced quite recently (in #14069 which was merged two days ago) and since this is a recurring thing (see #13534 – "Don't assert(foo()) where foo() has side effects" from May) I added a simple regression test for the most obvious common side effect.

Tree-SHA512: be65db9d8d5d0f5752152ba73fe3fbb0531880f156d3cd7dfdf1752709979b63214e46ae64b1adbe1e09fa121278f4087f4ae49bff16cf8f5aec16ea6bde3650

src/test/scheduler_tests.cpp

@@ -138,11 +138,13 @@ BOOST_AUTO_TEST_CASE(singlethreadedscheduler_ordered)
     // the callbacks should run in exactly the order in which they were enqueued
     for (int i = 0; i < 100; ++i) {
         queue1.AddToProcessQueue([i, &counter1]() {
-            assert(i == counter1++);
+            bool expectation = i == counter1++;
+            assert(expectation);
         });
 
         queue2.AddToProcessQueue([i, &counter2]() {
-            assert(i == counter2++);
+            bool expectation = i == counter2++;
+            assert(expectation);
         });
     }