warn to log instead of stderr

When the reindex function rebuilds the log because of a missing first_log value, it warns about a potential memory leak to the log itself.

9unit.c

@@ -350,7 +350,7 @@ print_log(TestState *s)
 	TestLogEntry *e = s->first_log;
 	while(e)
 	{
-		if(e->text) print("%s\n", e->text);
+		if(e->text) print("\n%s", e->text);
 		else print("(empty message)\n");
 		e = e->next;
 	}
@@ -389,7 +389,8 @@ reindex(TestState *s)
 	else if (s->last_log) // we have a last log but no first?
 	{
 		s->first_log = s->last_log;
-		fprint(2, "potential memory leak in test log\n");
+		log_test_context(s);
+		append_test_log(s, "potential memory leak in test log");
 	}
 }
 

test/append-test-log.c

@@ -44,7 +44,13 @@ static void missing_last(TestState *);
 static void missing_first(TestState *);
 static void null_message(TestState *);
 static TestResult null_state(TestState *);
+static void chk_empty_first(TestState *, void *);
+static void chk_first(TestState *, void *);
+static void chk_second(TestState *, void *);
 static void chk_last(TestState *, void *);
+static void mf_chk_first(TestState *, void *);
+static void mf_chk_second(TestState *, void *);
+static void mf_chk_third(TestState*, void *);
 static void mk_log_data(LogData *);
 
 static void chk_ptr_chg(
@@ -77,8 +83,16 @@ append_to_empty(TestState *s)
 	TestState test;
 	mk_sample_state(&test);
 	append_test_log(&test, "foo");
-	chk_ptr_ne(s, "first_log", test.first_log, 0);
-	chk_str_eq(s, "first_log->text", test.first_log->text, "foo");
+
+	// first_log
+	test_context_with(
+		s,
+		"first_log",
+		chk_empty_first,
+		&test
+	);
+
+	// last_log
 	chk_ptr_eq(s, "last_log", test.last_log, test.first_log);
 }
 
@@ -88,7 +102,8 @@ append_to_existing(TestState *s)
 	LogData ld;
 	mk_log_data(&ld);
 	append_test_log(&ld.state, "baz");
-	chk_ptr_eq(s, "first_log", ld.state.first_log, &ld.first);
+	test_context_with(s, "first_log", chk_first, &ld);
+	test_context_with(s, "second log", chk_second, &ld);
 	test_context_with(s, "last_log", chk_last, &ld);
 }
 
@@ -99,7 +114,8 @@ missing_last(TestState *s)
 	mk_log_data(&ld);
 	ld.state.last_log = 0;
 	append_test_log(&ld.state, "baz");
-	chk_ptr_eq(s, "first_log", ld.state.first_log, &ld.first);
+	test_context_with(s, "first_log", chk_first, &ld);
+	test_context_with(s, "second log", chk_second, &ld);
 	test_context_with(s, "last_log", chk_last, &ld);
 }
 
@@ -110,7 +126,7 @@ missing_first(TestState *s)
 	mk_log_data(&ld);
 	ld.state.first_log = 0;
 	append_test_log(&ld.state, "baz");
-	chk_ptr_eq(s, "first_log", ld.state.first_log, &ld.second);
+	test_context_with(s, "first_log", mf_chk_first, &ld);
 	test_context_with(s, "last_log", chk_last, &ld);
 }
 
@@ -132,6 +148,48 @@ null_state(TestState *)
 	return test_success;
 }
 
+static void
+chk_empty_first(TestState *s, void *ptr)
+{
+	TestState *test = ptr;
+	chk_str_eq(s, "text", test->first_log->text, "foo");
+	chk_ptr_eq(s, "next", test->first_log->next, 0);
+}
+
+static void
+chk_first(TestState *s, void *ptr)
+{
+	LogData *ld = ptr;
+
+	// first_log
+	chk_ptr_eq(
+		s,
+		0,
+		ld->state.first_log,
+		&ld->first
+	);
+
+	// next
+	chk_ptr_eq(
+		s,
+		"next",
+		ld->state.first_log->next,
+		&ld->second
+	);
+}
+
+static void
+chk_second(TestState *s, void *ptr)
+{
+	LogData *ld = ptr;
+	chk_ptr_eq(
+		s,
+		"next",
+		ld->second.next,
+		ld->state.last_log
+	);
+}
+
 static void
 chk_last(TestState *s, void *ptr)
 {
@@ -143,6 +201,37 @@ chk_last(TestState *s, void *ptr)
 	free(ld->state.last_log);
 }
 
+static void
+mf_chk_first(TestState *s, void *ptr)
+{
+	LogData *ld = ptr;
+	chk_ptr_eq(s, 0, ld->state.first_log, &ld->second);
+	test_context_with(s, "next", mf_chk_second, ptr);
+}
+
+static void
+mf_chk_second(TestState *s, void *ptr)
+{
+	LogData *ld = ptr;
+	TestLogEntry *e = ld->second.next;
+	chk_str_eq(s, "text", e->text, "<no context>");
+	test_context_with(s, "next", mf_chk_third, ptr);
+}
+
+static void
+mf_chk_third(TestState *s, void *ptr)
+{
+	LogData *ld = ptr;
+	TestLogEntry *e = ld->second.next->next;
+	chk_str_eq(
+		s,
+		"text",
+		e->text,
+		"potential memory leak in test log"
+	);
+	chk_ptr_eq(s, "next", e->next, ld->state.last_log);
+}
+
 static void
 mk_log_data(LogData *ld)
 {