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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "src/ftrace_reader/ftrace_procfs.h"
     18 
     19 #include "gmock/gmock.h"
     20 #include "gtest/gtest.h"
     21 
     22 using testing::AnyNumber;
     23 using testing::IsEmpty;
     24 using testing::Return;
     25 using testing::UnorderedElementsAre;
     26 
     27 namespace perfetto {
     28 namespace {
     29 
     30 class MockFtraceProcfs : public FtraceProcfs {
     31  public:
     32   MockFtraceProcfs() : FtraceProcfs("/root/") {}
     33 
     34   MOCK_METHOD2(WriteToFile,
     35                bool(const std::string& path, const std::string& str));
     36   MOCK_METHOD1(ReadOneCharFromFile, char(const std::string& path));
     37   MOCK_METHOD1(ClearFile, bool(const std::string& path));
     38   MOCK_CONST_METHOD1(ReadFileIntoString, std::string(const std::string& path));
     39   MOCK_CONST_METHOD0(NumberOfCpus, size_t());
     40 };
     41 
     42 TEST(FtraceProcfsTest, ParseAvailableClocks) {
     43   MockFtraceProcfs ftrace;
     44 
     45   EXPECT_CALL(ftrace, ReadFileIntoString("/root/trace_clock"))
     46       .WillOnce(Return("[local] global boot"));
     47   EXPECT_THAT(ftrace.AvailableClocks(),
     48               UnorderedElementsAre("local", "global", "boot"));
     49 
     50   EXPECT_CALL(ftrace, ReadFileIntoString("/root/trace_clock"))
     51       .WillOnce(Return("[local] global boot"));
     52   EXPECT_THAT(ftrace.GetClock(), "local");
     53 
     54   EXPECT_CALL(ftrace, ReadFileIntoString("/root/trace_clock"))
     55       .WillOnce(Return("local [global] boot"));
     56   EXPECT_THAT(ftrace.GetClock(), "global");
     57 
     58   EXPECT_CALL(ftrace, ReadFileIntoString("/root/trace_clock"))
     59       .WillOnce(Return(""));
     60   EXPECT_THAT(ftrace.AvailableClocks(), IsEmpty());
     61 }
     62 
     63 }  // namespace
     64 }  // namespace perfetto
     65