tests/lib: C++ify `test-fields-bin.cpp`

 - use the C++ bindings
 - rename `test_string_clear` to `testStringClear`
 - use an anonymous namespace
 - declare testStringClear as `noexcept`
 - use constexpr

I checked that the test still managed to catch the bug fixed in
0022a87819b0 ("Fix: clear_string_field(): set first character to 0").

Change-Id: I3631b22f9e70ea5db620ce0597d04e5035bfa91d
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/11793
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>

diff --git a/tests/lib/test-fields-bin.cpp b/tests/lib/test-fields-bin.cpp
index 7f2c26d4151e4d6eded79c8655f6023e62f980b5..79f50f31a8eadba4fda5558e25e2836cbb15df3b 100644 (file)
--- a/tests/lib/test-fields-bin.cpp
+++ b/tests/lib/test-fields-bin.cpp
@@ -4,72 +4,51 @@
  * Copyright (C) 2023 EfficiOS Inc.
  */
 
-#include <cstring>
-
 #include "common/assert.h"
 
 #include "utils/run-in.hpp"
 
 #include "tap/tap.h"
 
-static const int NR_TESTS = 2;
+namespace {
+
+constexpr int NR_TESTS = 2;
 
-static void test_string_clear()
+void testStringClear() noexcept
 {
     runInMsgIterClsInit([](const bt2::SelfMessageIterator self) {
         /* Boilerplate to get a string field */
-        const auto traceCls =
-            bt_trace_class_create(bt_self_message_iterator_borrow_component(self.libObjPtr()));
-        const auto streamCls = bt_stream_class_create(traceCls);
-        const auto eventCls = bt_event_class_create(streamCls);
-        const auto payloadCls = bt_field_class_structure_create(traceCls);
-
-        {
-            const auto stringFieldCls = bt_field_class_string_create(traceCls);
-            const auto status =
-                bt_field_class_structure_append_member(payloadCls, "str", stringFieldCls);
-            BT_ASSERT(status == BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK);
-            bt_field_class_put_ref(stringFieldCls);
-        }
+        const auto traceCls = self.component().createTraceClass();
+        const auto streamCls = traceCls->createStreamClass();
+        const auto eventCls = streamCls->createEventClass();
+        const auto payloadCls = traceCls->createStructureFieldClass();
 
-        {
-            const auto status = bt_event_class_set_payload_field_class(eventCls, payloadCls);
-            BT_ASSERT(status == BT_EVENT_CLASS_SET_FIELD_CLASS_STATUS_OK);
-        }
+        payloadCls->appendMember("str", *traceCls->createStringFieldClass());
+        eventCls->payloadFieldClass(*payloadCls);
 
-        const auto trace = bt_trace_create(traceCls);
-        const auto stream = bt_stream_create(streamCls, trace);
-        const auto msg = bt_message_event_create(self.libObjPtr(), eventCls, stream);
-        const auto field = bt_field_structure_borrow_member_field_by_name(
-            bt_event_borrow_payload_field(bt_message_event_borrow_event(msg)), "str");
+        const auto trace = traceCls->instantiate();
+        const auto stream = streamCls->instantiate(*trace);
+        const auto msg = self.createEventMessage(*eventCls, *stream);
+        const auto field = (*msg->event().payloadField())["str"]->asString();
 
         /* Set the field to a known non-empty value */
-        {
-            const auto status = bt_field_string_set_value(field, "pomme");
-            BT_ASSERT(status == BT_FIELD_STRING_SET_VALUE_STATUS_OK);
-            BT_ASSERT(std::strcmp(bt_field_string_get_value(field), "pomme") == 0);
-        }
+        *field = "pomme";
+        BT_ASSERT(field.value() == "pomme");
 
         /* Clear the field, verify its value and length */
-        bt_field_string_clear(field);
-        ok(std::strcmp(bt_field_string_get_value(field), "") == 0, "string field is empty");
-        ok(bt_field_string_get_length(field) == 0, "string field length is 0");
-
-        bt_message_put_ref(msg);
-        bt_stream_put_ref(stream);
-        bt_trace_put_ref(trace);
-        bt_field_class_put_ref(payloadCls);
-        bt_event_class_put_ref(eventCls);
-        bt_stream_class_put_ref(streamCls);
-        bt_trace_class_put_ref(traceCls);
+        field.clear();
+        ok(field.value() == "", "string field is empty");
+        ok(field.length() == 0, "string field length is 0");
     });
 }
 
+} /* namespace */
+
 int main()
 {
     plan_tests(NR_TESTS);
 
-    test_string_clear();
+    testStringClear();
 
     return exit_status();
 }