void
apply_scope_and_check_trace_context(
    sentry_options_t *options, const char *trace_id, const char *parent_span_id)
{
    // simulate scope application onto an event
    sentry_value_t event = sentry_value_new_object();
    SENTRY_WITH_SCOPE (scope) {
        sentry__scope_apply_to_event(scope, options, event, SENTRY_SCOPE_NONE);
    }

    // check that the event has a trace context
    sentry_value_t event_contexts = sentry_value_get_by_key(event, "contexts");
    TEST_CHECK(!sentry_value_is_null(event_contexts));
    TEST_CHECK(
        sentry_value_get_type(event_contexts) == SENTRY_VALUE_TYPE_OBJECT);

    sentry_value_t event_trace_context
        = sentry_value_get_by_key(event_contexts, "trace");
    TEST_CHECK(!sentry_value_is_null(event_trace_context));
    TEST_CHECK(
        sentry_value_get_type(event_trace_context) == SENTRY_VALUE_TYPE_OBJECT);

    // check trace context content
    const char *event_trace_id = sentry_value_as_string(
        sentry_value_get_by_key(event_trace_context, "trace_id"));
    TEST_CHECK_STRING_EQUAL(event_trace_id, trace_id);

    const char *event_trace_parent_span_id = sentry_value_as_string(
        sentry_value_get_by_key(event_trace_context, "parent_span_id"));
    TEST_CHECK_STRING_EQUAL(event_trace_parent_span_id, parent_span_id);

    sentry_uuid_t event_trace_span_id = sentry__value_as_uuid(
        sentry_value_get_by_key(event_trace_context, "span_id"));
    TEST_CHECK(!sentry_uuid_is_nil(&event_trace_span_id));

    sentry_value_decref(event);
}

SENTRY_TEST(set_trace_id_with_txn)
{
    // initialize SDK so we have a scope
    sentry_options_t *options = sentry_options_new();
    sentry_options_set_traces_sample_rate(options, 1.0);
    sentry_options_set_sample_rate(options, 1.0);
    sentry_init(options);

    // inject a trace via trace-header into a transaction
    const char *trace_header
        = "2674eb52d5874b13b560236d6c79ce8a-a0f9fdf04f1a63df-1";
    const char *txn_trace_id = "2674eb52d5874b13b560236d6c79ce8a";
    const char *txn_parent_span_id = "a0f9fdf04f1a63df";
    sentry_transaction_context_t *tx_ctx
        = sentry_transaction_context_new("wow!", NULL);
    sentry_transaction_context_update_from_header(
        tx_ctx, "sentry-trace", trace_header);
    sentry_transaction_t *tx
        = sentry_transaction_start(tx_ctx, sentry_value_new_null());

    // set the direct trace first
    const char *direct_trace_id = "aaaabbbbccccddddeeeeffff00001111";
    const char *direct_parent_span_id = "f0f0f0f0f0f0f0f0";
    sentry_set_trace(direct_trace_id, direct_parent_span_id);

    // events should get that trace applied
    apply_scope_and_check_trace_context(
        options, direct_trace_id, direct_parent_span_id);

    // now set a scoped transaction
    sentry_set_transaction_object(tx);

    // events should get the transaction's trace applied
    apply_scope_and_check_trace_context(
        options, txn_trace_id, txn_parent_span_id);

    sentry_transaction_finish(tx);

    // after finishing the transaction, the direct trace should hit again
    apply_scope_and_check_trace_context(
        options, direct_trace_id, direct_parent_span_id);

    sentry_close();
}