src/testutils/testfilemanager.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares gmx::test::TestFileManager.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_testutils
  42  */
  43 /*! \libinternal \defgroup module_testutils Unit Testing Utilities (testutils)
  44  * \brief
  45  * Common helper classes and functions for writing unit tests.
  46  *
  47  * To build unit tests using these utilities, libxml2 is required.
  48  *
  49  * \ingroup group_utilitymodules
  50  */
  51 #ifndef GMX_TESTUTILS_TESTFILEMANAGER_H
  52 #define GMX_TESTUTILS_TESTFILEMANAGER_H
  53
  54 #include <string>
  55
  56 #include "gromacs/utility/common.h"
  57
  58 namespace gmx
  59 {
  60 /*! \libinternal \brief
  61  * Testing utilities namespace.
  62  *
  63  * This namespace contains utilities for writing unit tests, mostly from the
  64  * \ref module_testutils module.
  65  */
  66 namespace test
  67 {
  68
  69 /*! \libinternal \brief
  70  * Helper for tests that need input and output files.
  71  *
  72  * To be used as a member in a test fixture class, this class provides
  73  * getTemporaryFilePath() method that returns a path for creating file names
  74  * for temporary files.  The returned path contains the name of the running
  75  * test, making it unique across tests.  Additionally, this class takes care of
  76  * removing any temporary files (i.e., all paths returned by
  77  * getTemporaryFilePath()) at test teardown (i.e., when the
  78  * TestFileManager is destructed).
  79  *
  80  * In addition, class-level static accessors provide means to
  81  * access data files that are located in the test source directory.
  82  * This is used to provide input files for the tests, and also to
  83  * store test reference data persistently (see TestReferenceData).
  84  *
  85  * Note that setInputDataDirectory() and
  86  * setGlobalOutputTempDirectory() must be called in setup code, before
  87  * creating any objects of this class that are used for accessing the
  88  * paths for these respective directories. Code in tests should avoid
  89  * calling setGlobalOutputTempDirectory(), and instead instantiate an
  90  * object and use setOutputTempDirectory(), so that the global state
  91  * is not changed.
  92  *
  93  * \inlibraryapi
  94  * \ingroup module_testutils
  95  */
  96 class TestFileManager
  97 {
  98     public:
  99         /*! \brief Constructor */
 100         TestFileManager();
 101         /*! \brief Frees internal storage and deletes any accessed
 102          * file paths
 103          *
 104          * Any errors (e.g., missing files) encountered while deleting the
 105          * files are ignored.
 106          */
 107         ~TestFileManager();
 108
 109         /*! \brief
 110          * Creates a name for a temporary file within a single unit test.
 111          *
 112          * \param[in] suffix  Suffix to add to the file name (should contain an
 113          *      extension if one is desired).
 114          * \returns   Temporary file name that includes the test name and
 115          *      \p suffix.
 116          *
 117          * This method should only be called from within a Google Test test.
 118          * Two calls with the same \p suffix return the same string within the
 119          * same test.
 120          */
 121         std::string getTemporaryFilePath(const char *suffix);
 122         //! \copydoc TestFileManager::getTemporaryFilePath(const char *)
 123         std::string getTemporaryFilePath(const std::string &suffix);
 124
 125         /*! \brief Returns the path to the output temporary directory
 126          * for tests which use this TestFileManager object.
 127          *
 128          * \returns Path to output temporary directory
 129          */
 130         const char *getOutputTempDirectory() const;
 131
 132         /*! \brief Sets the output temporary directory for tests which
 133          * use this TestFileManager object.
 134          *
 135          * \param[in] path  Path at which test should write temporary files
 136          *
 137          * \p path must name an existing directory. An internal copy
 138          * of path is made. The caller is responsible for holding a
 139          * valid mutex on the object before calling this member
 140          * function.
 141          */
 142         void setOutputTempDirectory(const std::string &path);
 143
 144         // static functions follow
 145
 146         /*! \brief
 147          * Creates a file name root for use within a single unit test.
 148          *
 149          * This method should only be called from within a Google Test
 150          * test. Uses the Google Test test fixture and test case name
 151          * to construct a string that is unique over all
 152          * tests. Intended to produce distinct names for files that
 153          * may be stored in the same directory for multiple tests.
 154          */
 155         static std::string getTestSpecificFileNameRoot();
 156
 157         /*! \brief
 158          * Creates a file name for use within a single unit test.
 159          *
 160          * \param[in] suffix  Suffix to add to the file name (should contain an
 161          *      extension if one is desired).
 162          * \returns   File name that includes the test name and
 163          *      \p suffix.
 164          *
 165          * This method should only be called from within a Google Test test.
 166          * Two calls with the same \p suffix return the same string within the
 167          * same test.
 168          * Intended to produce distinct names for files that may be stored in
 169          * the same directory for multiple tests.
 170          */
 171         static std::string getTestSpecificFileName(const char *suffix);
 172
 173         /*! \brief
 174          * Returns the path to a test input file.
 175          *
 176          * \param[in] filename  Relative path/filename to a test input file.
 177          * \returns Path to \p filename under the test input data directory.
 178          */
 179         static std::string getInputFilePath(const char *filename);
 180
 181         /*! \brief
 182          * Returns the path to the test input directory.
 183          *
 184          * \returns Path to input data directory for the test executable.
 185          */
 186         static const char *getInputDataDirectory();
 187
 188         /*! \brief
 189          * Sets the test input directory.
 190          *
 191          * \param[in] path  Path from which test input data is looked up from.
 192          *
 193          * \p path must name an existing directory.
 194          *
 195          * This function is automatically called by unittest_main.cpp through
 196          * initTestUtils().
 197          */
 198         static void setInputDataDirectory(const char *path);
 199
 200         /*! \brief Returns the path to the global test output
 201          * temporary directory for future TestFileManager objects.
 202          *
 203          * \returns Path to default output temporary directory for the test executable.
 204          */
 205         static const char *getGlobalOutputTempDirectory();
 206
 207         /*! \brief Sets the default global test output temporary
 208          * directory for future TestFileManager objects.
 209          *
 210          * \param[in] path  Path at which tests should write temporary files
 211          *
 212          * \p path must name an existing directory.
 213          *
 214          * This function is automatically called by unittest_main.cpp
 215          * through initTestUtils(). Test fixtures should call
 216          * setOutputTempDirectory(), rather than change the global
 217          * state.
 218          */
 219         static void setGlobalOutputTempDirectory(const char *path);
 220
 221     private:
 222         class Impl;
 223
 224         PrivateImplPointer<Impl> impl_;
 225 };
 226
 227 } // namespace test
 228 } // namespace gmx
 229
 230 #endif