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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "printing/backend/print_backend_win.h"
#include <stddef.h>
#include <optional>
#include "base/strings/to_string.h"
#include "base/strings/utf_string_conversions.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/scoped_feature_list.h"
#include "printing/backend/spooler_win.h"
#include "printing/backend/win_helper.h"
#include "printing/printing_features.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace printing {
namespace {
void DidLoadPrintableArea(size_t& counter) {
++counter;
}
} // namespace
// This test makes use of a real print backend instance, and thus will
// interact with printer drivers installed on a system. This can be useful on
// machines which a developer has control over the driver installations, but is
// less useful on bots which are managed by the infra team. This test is
// intended to be run manually by developers using the --run-manual flag.
// Using the --v=1 flag will also display logging of all the printers in the
// enumeration list.
TEST(PrintBackendWinTest, MANUAL_ValidateFastEnumeratePrinters) {
// Disable the feature, which forces `EnumeratePrinters()` to use the legacy
// method to get the PrinterList result.
base::test::ScopedFeatureList scoped_disable;
scoped_disable.InitAndDisableFeature(features::kFastEnumeratePrinters);
// Get list of printer info using only the Print Spooler API.
const bool expect_some_printers =
internal::IsSpoolerRunning() == internal::SpoolerServiceStatus::kRunning;
VLOG(1) << "Print Spooler service is running: "
<< base::ToString(expect_some_printers);
const mojom::ResultCode expect_result = expect_some_printers
? mojom::ResultCode::kSuccess
: mojom::ResultCode::kFailed;
base::HistogramTester histogram_tester;
PrinterList printer_list;
auto backend = base::MakeRefCounted<PrintBackendWin>();
EXPECT_EQ(backend->EnumeratePrinters(printer_list), expect_result);
EXPECT_EQ(expect_some_printers, !printer_list.empty());
// For each printer, validate that faster method to get basic information
// using the mixed method of Print Spooler and the registry.
VLOG(1) << "Number of printers found: " << printer_list.size();
for (const auto& info_spooler_only : printer_list) {
VLOG(1) << "Found printer: `" << info_spooler_only.printer_name << "`";
ScopedPrinterHandle printer;
ASSERT_TRUE(printer.OpenPrinterWithName(
base::UTF8ToWide(info_spooler_only.printer_name).c_str()));
std::optional<PrinterBasicInfo> info_using_registry =
GetBasicPrinterInfoMixedMethodForTesting(printer.Get());
EXPECT_THAT(info_using_registry, testing::Optional(info_spooler_only));
}
EXPECT_THAT(
histogram_tester.GetAllSamples(
"Printing.EnumeratePrinters.BasicInfo.Registry"),
BucketsAre(base::Bucket(false, 0),
base::Bucket(true, static_cast<int>(printer_list.size()))));
}
TEST(PrintBackendWinTest, GetPrintableAreaSamePaper) {
auto backend = base::MakeRefCounted<PrintBackendWin>();
size_t load_printable_area_call_count = 0;
backend->SetPrintableAreaLoadedCallbackForTesting(base::BindRepeating(
DidLoadPrintableArea, std::ref(load_printable_area_call_count)));
std::string printer_name;
mojom::ResultCode result = backend->GetDefaultPrinterName(printer_name);
if (result != mojom::ResultCode::kSuccess || printer_name.empty()) {
GTEST_SKIP() << "Printing with real drivers not available";
}
PrinterSemanticCapsAndDefaults caps;
result = backend->GetPrinterSemanticCapsAndDefaults(printer_name, &caps);
if (result != mojom::ResultCode::kSuccess) {
GTEST_SKIP()
<< "Invalid real print driver configuration, printer is not available";
}
EXPECT_EQ(1u, load_printable_area_call_count);
// Request printable area for the same default paper size. This should use
// the cached printable area instead of making another call to
// `LoadPaperPrintableAreaUm()`.
std::optional<gfx::Rect> printable_area_um = backend->GetPaperPrintableArea(
printer_name, caps.default_paper.vendor_id(),
caps.default_paper.size_um());
ASSERT_TRUE(printable_area_um.has_value());
EXPECT_EQ(1u, load_printable_area_call_count);
}
TEST(PrintBackendWinTest, GetPrintableAreaDifferentPaper) {
auto backend = base::MakeRefCounted<PrintBackendWin>();
size_t load_printable_area_call_count = 0;
backend->SetPrintableAreaLoadedCallbackForTesting(base::BindRepeating(
DidLoadPrintableArea, std::ref(load_printable_area_call_count)));
std::string printer_name;
mojom::ResultCode result = backend->GetDefaultPrinterName(printer_name);
if (result != mojom::ResultCode::kSuccess || printer_name.empty()) {
GTEST_SKIP() << "Printing with real drivers not available";
}
PrinterSemanticCapsAndDefaults caps;
EXPECT_EQ(mojom::ResultCode::kSuccess,
backend->GetPrinterSemanticCapsAndDefaults(printer_name, &caps));
EXPECT_EQ(1u, load_printable_area_call_count);
// Request printable area for a different paper size.
ASSERT_GT(caps.papers.size(), 1u);
std::optional<gfx::Rect> other_printable_area_um;
for (const auto& paper : caps.papers) {
if (paper == caps.default_paper) {
continue;
}
// Another call to `LoadPaperPrintableAreaUm()` should happen since the
// paper is different.
other_printable_area_um = backend->GetPaperPrintableArea(
printer_name, paper.vendor_id(), paper.size_um());
break;
}
EXPECT_EQ(2u, load_printable_area_call_count);
}
} // namespace printing
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