[cronet] make startNetLogToFile write to correct file

components/cronet/ios/test/cronet_netlog_test.mm

+// Copyright 2016 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.
+
+#import <Cronet/Cronet.h>
+#import <Foundation/Foundation.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cronet {
+
+void StartCronetIfNecessary();
+
+class NetLogTest : public ::testing::Test {
+ protected:
+  NetLogTest() {}
+  ~NetLogTest() override {}
+
+  void SetUp() override { StartCronetIfNecessary(); }
+};
+
+TEST(NetLogTest, OpenFile) {
+  bool netlog_started =
+      [Cronet startNetLogToFile:@"cronet_netlog.json" logBytes:YES];
+  [Cronet stopNetLog];
+
+  EXPECT_TRUE(netlog_started);
+}
+
+TEST(NetLogTest, CreateFile) {
+  NSString* filename = [[[NSProcessInfo processInfo] globallyUniqueString]
+      stringByAppendingString:@"_netlog.json"];
+  bool netlog_started = [Cronet startNetLogToFile:filename logBytes:YES];
+  [Cronet stopNetLog];
+
+  bool file_created = [[NSFileManager defaultManager]
+      fileExistsAtPath:[Cronet getNetLogPathForFile:filename]];
+
+  [[NSFileManager defaultManager]
+      removeItemAtPath:[Cronet getNetLogPathForFile:filename]
+                 error:nil];
+
+  EXPECT_TRUE(netlog_started);
+  EXPECT_TRUE(file_created);
+}
+
+TEST(NetLogTest, NonExistantDir) {
+  NSString* notdir = [[[NSProcessInfo processInfo] globallyUniqueString]
+      stringByAppendingString:@"/netlog.json"];
+  bool netlog_started = [Cronet startNetLogToFile:notdir logBytes:NO];
+
+  EXPECT_FALSE(netlog_started);
+}
+
+TEST(NetLogTest, ExistantDir) {
+  NSString* dir = [[NSProcessInfo processInfo] globallyUniqueString];
+
+  bool dir_created = [[NSFileManager defaultManager]
+            createDirectoryAtPath:[Cronet getNetLogPathForFile:dir]
+      withIntermediateDirectories:NO
+                       attributes:nil
+                            error:nil];
+
+  bool netlog_started =
+      [Cronet startNetLogToFile:[dir stringByAppendingString:@"/netlog.json"]
+                       logBytes:NO];
+
+  [[NSFileManager defaultManager]
+      removeItemAtPath:[Cronet
+                           getNetLogPathForFile:
+                               [dir stringByAppendingString:@"/netlog.json"]]
+                 error:nil];
+
+  [[NSFileManager defaultManager]
+      removeItemAtPath:[Cronet getNetLogPathForFile:dir]
+                 error:nil];
+
+  EXPECT_TRUE(dir_created);
+  EXPECT_TRUE(netlog_started);
+}
+
+TEST(NetLogTest, EmptyFilename) {
+  bool netlog_started = [Cronet startNetLogToFile:@"" logBytes:NO];
+
+  EXPECT_FALSE(netlog_started);
+}
+
+TEST(NetLogTest, AbsoluteFilename) {
+  bool netlog_started =
+      [Cronet startNetLogToFile:@"/home/netlog.json" logBytes:NO];
+
+  EXPECT_FALSE(netlog_started);
+}
+}