Implement a JavaScript API for document scanning

chrome/browser/extensions/api/document_scan/document_scan_api_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#include "chrome/browser/extensions/api/document_scan/document_scan_api.h"
+
+#include <string>
+#include <vector>
+
+#include "chrome/browser/extensions/api/document_scan/mock_document_scan_interface.h"
+#include "chrome/browser/extensions/extension_api_unittest.h"
+#include "chrome/browser/extensions/extension_function_test_utils.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using extension_function_test_utils::RunFunctionFlags::NONE;
+using std::string;
+using std::vector;
+using testing::_;
+
+namespace extensions {
+
+namespace api {
+
+// Tests of networking_private_crypto support for Networking Private API.
+class DocumentScanScanFunctionTest : public ExtensionApiUnittest {
+ public:
+  DocumentScanScanFunctionTest()
+      : function_(new DocumentScanScanFunction()),
+        document_scan_interface_(new MockDocumentScanInterface()) {}
+  virtual ~DocumentScanScanFunctionTest() {}
+
+  void SetUp() {
+    ExtensionApiUnittest::SetUp();
+    // Passes ownership.
+    function_->document_scan_interface_.reset(document_scan_interface_);
+  }
+
+ protected:
+  string RunFunctionAndReturnError(const string& args) {
+    function_->set_extension(extension());
+    string error = extension_function_test_utils::RunFunctionAndReturnError(
+                       function_, args, browser(), NONE);
+    return error;
+  }
+
+  DocumentScanScanFunction* function_;
+  MockDocumentScanInterface* document_scan_interface_;  // Owned by function_.
+};
+
+ACTION_P2(InvokeListScannersCallback, scanner_list, error) {
+  ::std::tr1::get<0>(args).Run(scanner_list, error);
+}
+
+ACTION_P3(InvokeScanCallback, data, mime_type, error) {
+  ::std::tr1::get<3>(args).Run(data, mime_type, error);
+}
+
+TEST_F(DocumentScanScanFunctionTest, GestureRequired) {
+  EXPECT_EQ("User gesture required to perform scan",
+            RunFunctionAndReturnError("[{}]"));
+}
+
+TEST_F(DocumentScanScanFunctionTest, NoScanners) {
+  function_->set_user_gesture(true);
+  EXPECT_CALL(*document_scan_interface_, ListScanners(_))
+      .WillOnce(InvokeListScannersCallback(
+                    vector<DocumentScanInterface::ScannerDescription>(), ""));
+  EXPECT_EQ("Scanner not available",
+            RunFunctionAndReturnError("[{}]"));
+}
+
+TEST_F(DocumentScanScanFunctionTest, NoMatchingScanners) {
+  function_->set_user_gesture(true);
+  vector<DocumentScanInterface::ScannerDescription> scanner_list;
+  DocumentScanInterface::ScannerDescription scanner;
+  scanner.image_mime_type = "img/fresco";
+  scanner_list.push_back(scanner);
+  EXPECT_CALL(*document_scan_interface_, ListScanners(_))
+      .WillOnce(InvokeListScannersCallback(scanner_list, ""));
+  EXPECT_EQ(
+      "Scanner not available",
+      RunFunctionAndReturnError("[{\"mimeTypes\": [\"img/silverpoint\"]}]"));
+}
+
+TEST_F(DocumentScanScanFunctionTest, ScanFailure) {
+  function_->set_user_gesture(true);
+  vector<DocumentScanInterface::ScannerDescription> scanner_list;
+  DocumentScanInterface::ScannerDescription scanner;
+  const char kMimeType[] = "img/tempera";
+  const char kScannerName[] = "Michelangelo";
+  scanner.name = kScannerName;
+  scanner.image_mime_type = kMimeType;
+  scanner_list.push_back(scanner);
+  EXPECT_CALL(*document_scan_interface_, ListScanners(_))
+      .WillOnce(InvokeListScannersCallback(scanner_list, ""));
+  const char kScanError[] = "Someone ate all the eggs";
+  EXPECT_CALL(*document_scan_interface_, Scan(kScannerName, _, _, _))
+      .WillOnce(InvokeScanCallback("", "", kScanError));
+  EXPECT_EQ(kScanError,
+            RunFunctionAndReturnError("[{\"mimeTypes\": [\"img/tempera\"]}]"));
+}
+
+TEST_F(DocumentScanScanFunctionTest, Success) {
+  vector<DocumentScanInterface::ScannerDescription> scanner_list;
+  scanner_list.emplace_back();
+  EXPECT_CALL(*document_scan_interface_, ListScanners(_))
+      .WillOnce(InvokeListScannersCallback(scanner_list, ""));
+  const char kScanData[] = "A beautiful picture";
+  const char kMimeType[] = "img/encaustic";
+  EXPECT_CALL(*document_scan_interface_, Scan(_, _, _, _))
+      .WillOnce(InvokeScanCallback(kScanData, kMimeType, ""));
+  function_->set_user_gesture(true);
+  scoped_ptr<base::DictionaryValue> result(RunFunctionAndReturnDictionary(
+      function_, "[{}]"));
+  ASSERT_NE(nullptr, result.get());
+  document_scan::ScanResults scan_results;
+  EXPECT_TRUE(document_scan::ScanResults::Populate(*result, &scan_results));
+  EXPECT_THAT(scan_results.data_urls, testing::ElementsAre(kScanData));
+  EXPECT_EQ(kMimeType, scan_results.mime_type);
+}
+
+}  // namespace api
+
+}  // namespace extensions