G_FILE_CREATE_REPLACE_DESTINATION

gistfile1.txt

static void
test_coverage_data_file_is_overwritten_completely(gpointer      fixture_data,
                                                  gconstpointer user_data)
{
    GjsDebugCoverageToSingleOutputFileFixture *fixture = (GjsDebugCoverageToSingleOutputFileFixture *) fixture_data;

    /* Write the string "existing contents" about one hundred times to the file
     * and check that the new file does not contain any string matching it */
    const gchar *existing_contents = "existing_contents\n";
    guint i = 0;

    for (; i < 100; ++i)
    {
        if (write(fixture->output_file_handle,
                  (gconstpointer) existing_contents,
                  sizeof(gchar) * strlen(existing_contents)) == -1)
            g_error("Failed to write to existing contents file");
    }

    gchar *coverage_data_contents =
        eval_script_and_get_coverage_data(fixture->base_fixture.context,
                                          fixture->base_fixture.coverage,
                                          fixture->base_fixture.temporary_js_script_filename,
                                          fixture->output_file_name,
                                          NULL);

    g_assert(strstr(coverage_data_contents, existing_contents) == NULL);
}