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[gromacs/AngularHB.git] / src / testutils / cmdlinetest.h

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/*! \libinternal \file
 * \brief
 * Declares utilities testing command-line programs.
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \inlibraryapi
 * \ingroup module_testutils
 */
#ifndef GMX_TESTUTILS_CMDLINETEST_H
#define GMX_TESTUTILS_CMDLINETEST_H

#include <functional>
#include <memory>
#include <string>

#include <gtest/gtest.h>

// arrayref.h is not strictly necessary for this header, but nearly all
// callers will need it to use the constructor that takes ConstArrayRef.
#include "gromacs/utility/arrayref.h"
#include "gromacs/utility/classhelpers.h"

namespace gmx
{

class ICommandLineModule;
class ICommandLineOptionsModule;

namespace test
{

class IFileMatcherSettings;
class ITextBlockMatcherSettings;
class TestFileManager;
class TestReferenceChecker;

/*! \libinternal \brief
 * Helper class for tests that need to construct command lines.
 *
 * This class helps in writing tests for command-line handling.
 * The constructor method takes an array of const char pointers, specifying the
 * command-line arguments, each as one array element.  It is also possible to
 * construct the command line by adding individual arguments with append() and
 * addOption().
 * The argc() and argv() methods can then be used to obtain `argc` and `argv`
 * (non-const char pointers) arrays for passing into methods that expect these.
 *
 * Note that although the interface allows passing the argc and argv pointers
 * to methods that modify them (typically as \p f(&argc(), argv())), currently
 * the CommandLine object is not in a consistent state internally if the
 * parameters are actually modified.  Reading the command line is possible
 * afterwards, but modification is not.
 *
 * If you need to construct command lines that refer to files on the file
 * system, see CommandLineTestHelper and CommandLineTestBase for additional
 * convenience utilities.
 *
 * All constructors and methods that modify this class may throw an
 * std::bad_alloc.  Const methods and accessors do not throw.
 *
 * \inlibraryapi
 * \ingroup module_testutils
 */
class CommandLine
{
    public:
        //! Initializes an empty command-line object.
        CommandLine();
        /*! \brief
         * Initializes a command-line object from an array.
         *
         * \param[in] cmdline  Array of command-line arguments.
         *
         * \p cmdline should include the binary name as the first element if
         * that is desired in the output.
         *
         * This constructor is not explicit to make it possible to create a
         * CommandLine object directly from a C array.
         */
        CommandLine(const ConstArrayRef<const char *> &cmdline);
        //! Creates a deep copy of a command-line object.
        CommandLine(const CommandLine &other);
        ~CommandLine();

        /*! \brief
         * Initializes a command-line object in-place from an array.
         *
         * \param[in] cmdline  Array of command-line arguments.
         *
         * \p cmdline should include the binary name as the first element if
         * that is desired in the output.
         *
         * This function does the same as the constructor that takes a
         * ConstArrayRef.  Any earlier contents of the object are discarded.
         *
         * Strong exception safety.
         */
        void initFromArray(const ConstArrayRef<const char *> &cmdline);

        /*! \brief
         * Appends an argument to the command line.
         *
         * \param[in] arg  Argument to append.
         *
         * Strong exception safety.
         */
        void append(const char *arg);
        //! Convenience overload taking a std::string.
        void append(const std::string &arg) { append(arg.c_str()); }
        /*! \brief
         * Adds an option to the command line, typically a boolean.
         *
         * \param[in] name   Name of the option to append, which
         *                   should start with "-".
         */
        void addOption(const char *name);
        /*! \brief
         * Adds an option-value pair to the command line.
         *
         * \param[in] name   Name of the option to append, which
         *                   should start with "-".
         * \param[in] value  Value of the argument to append.
         */
        void addOption(const char *name, const char *value);
        //! Convenience overload taking a std::string.
        void addOption(const char *name, const std::string &value);
        //! Overload taking an int.
        void addOption(const char *name, int value);
        //! Overload taking a double.
        void addOption(const char *name, double value);
        /*! \brief
         * Appends all arguments from \p args to the command line.
         *
         * If the first argument of \p args does not start with a `-`, it is
         * skipped, assuming it is a gmx module name and thus useless.
         */
        void merge(const CommandLine &args);

        //! Returns argc for passing into C-style command-line handling.
        int &argc();
        //! Returns argv for passing into C-style command-line handling.
        char **argv();
        //! Returns argc for passing into C-style command-line handling.
        int argc() const;
        //! Returns argv for passing into C-style command-line handling.
        const char *const *argv() const;
        //! Returns a single argument.
        const char *arg(int i) const;

        //! Returns the command line formatted as a single string.
        std::string toString() const;

        //! Whether the command line contains the given option.
        bool contains(const char *name) const;

    private:
        class Impl;

        PrivateImplPointer<Impl> impl_;
};

/*! \libinternal \brief
 * Helper class for tests that construct command lines that need to reference
 * existing files.
 *
 * This class provides helper methods for:
 *
 *   1. Adding input files to a CommandLine instance by generating them from a
 *      string provided in the test (setInputFileContents()).
 *   2. Adding output files to a CommandLine instance (setOutputFile()).
 *   3. Checking the contents of some of the output files using
 *      TestReferenceData (setOutputFile() and checkOutputFiles()).
 *   4. Static methods for easily executing command-line modules
 *      (various overloads of runModule()).
 *
 * All files created during the test are cleaned up at the end of the test.
 *
 * All methods can throw std::bad_alloc.
 *
 * \see TestFileManager
 * \inlibraryapi
 * \ingroup module_testutils
 */
class CommandLineTestHelper
{
    public:
        /*! \brief
         * Runs a command-line program that implements ICommandLineModule.
         *
         * \param[in,out] module       Module to run.
         *     The function does not take ownership.
         * \param[in,out] commandLine  Command line parameters to pass.
         *     This is only modified if \p module modifies it.
         * \returns The return value of the module.
         * \throws  unspecified  Any exception thrown by the module.
         */
        static int
        runModuleDirect(ICommandLineModule *module, CommandLine *commandLine);
        /*! \brief
         * Runs a command-line program that implements
         * ICommandLineOptionsModule.
         *
         * \param[in,out] module       Module to run.
         * \param[in,out] commandLine  Command line parameters to pass.
         *     This is only modified if \p module modifies it.
         * \returns The return value of the module.
         * \throws  unspecified  Any exception thrown by the module.
         */
        static int
        runModuleDirect(std::unique_ptr<ICommandLineOptionsModule> module,
                        CommandLine                               *commandLine);
        /*! \brief
         * Runs a command-line program that implements
         * ICommandLineOptionsModule.
         *
         * \param[in] factory          Factory method for the module to run.
         * \param[in,out] commandLine  Command line parameters to pass.
         *     This is only modified if the module modifies it.
         * \returns The return value of the module.
         * \throws  unspecified  Any exception thrown by the factory or the
         *     module.
         */
        static int
        runModuleFactory(std::function<std::unique_ptr<ICommandLineOptionsModule>()>  factory,
                         CommandLine                                                 *commandLine);

        /*! \brief
         * Initializes an instance.
         *
         * \param  fileManager  File manager to use for generating temporary
         *     file names and to track temporary files.
         */
        explicit CommandLineTestHelper(TestFileManager *fileManager);
        ~CommandLineTestHelper();

        /*! \brief
         * Generates and sets an input file.
         *
         * \param[in,out] args      CommandLine to which to add the option.
         * \param[in]     option    Option to set.
         * \param[in]     extension Extension for the file to create.
         * \param[in]     contents  Text to write to the input file.
         *
         * Creates a temporary file with contents from \p contents, and adds
         * \p option to \p args with a value that points to the generated file.
         */
        void setInputFileContents(CommandLine *args, const char *option,
                                  const char *extension,
                                  const std::string &contents);
        /*! \brief
         * Generates and sets an input file.
         *
         * \param[in,out] args      CommandLine to which to add the option.
         * \param[in]     option    Option to set.
         * \param[in]     extension Extension for the file to create.
         * \param[in]     contents  Text to write to the input file.
         *
         * Creates a temporary file with contents from \p contents (each array
         * entry on its own line), and adds \p option to \p args with a value
         * that points to the generated file.
         */
        void setInputFileContents(CommandLine *args, const char *option,
                                  const char *extension,
                                  const ConstArrayRef<const char *> &contents);
        /*! \brief
         * Sets an output file parameter and adds it to the set of tested files.
         *
         * \param[in,out] args      CommandLine to which to add the option.
         * \param[in]     option    Option to set.
         * \param[in]     filename  Name of the output file.
         * \param[in]     matcher   Specifies how the contents of the file are
         *     tested.
         *
         * This method does the following:
         *  - Adds \p option to \p args to point a temporary file name
         *    constructed from \p filename.
         *  - Makes checkOutputFiles() to check the contents of the file
         *    against reference data, using \p matcher.
         *  - Marks the temporary file for removal at test teardown.
         *
         * \p filename is given to TestTemporaryFileManager to make a unique
         * filename for the temporary file.
         * If \p filename starts with a dot, a unique number is prefixed (such
         * that it is possible to create multiple files with the same extension
         * by just specifying the extension for every call of setOutputFile()).
         *
         * If the output file is needed to trigger some computation, or is
         * unconditionally produced by the code under test, but the contents
         * are not interesting for the test, use NoContentsMatch as the matcher.
         * Note that the existence of the output file is still verified.
         */
        void setOutputFile(CommandLine *args, const char *option,
                           const char *filename,
                           const ITextBlockMatcherSettings &matcher);
        //! \copydoc setOutputFile(CommandLine *, const char *, const char *, const ITextBlockMatcherSettings &)
        void setOutputFile(CommandLine *args, const char *option,
                           const char *filename,
                           const IFileMatcherSettings &matcher);

        /*! \brief
         * Checks output files added with setOutputFile() against reference
         * data.
         *
         * \param     checker  Reference data root location where the reference
         *     data is stored.
         *
         * The file contents are tested verbatim, using direct string
         * comparison.  The text can be found verbatim in the reference data
         * XML files for manual inspection.
         *
         * Generates non-fatal test failures if some output file contents do
         * not match the reference data.
         */
        void checkOutputFiles(TestReferenceChecker checker) const;

    private:
        class Impl;

        PrivateImplPointer<Impl> impl_;
};

/*! \libinternal \brief
 * Test fixture for tests that call a single command-line program with
 * input/output files.
 *
 * This class provides a convenient package for using CommandLineTestHelper in
 * a test that do not need special customization.  It takes care of creating
 * the other necessary objects (like TestFileManager, TestReferenceData, and
 * CommandLine) and wrapping the methods from CommandLineTestHelper such that
 * extra parameters are not needed.  Additionally, it provides setInputFile()
 * as a convenience function for adding a fixed input file, pointing to a file
 * that resides in the source tree.
 *
 * \see CommandLineTestHelper
 * \inlibraryapi
 * \ingroup module_testutils
 */
class CommandLineTestBase : public ::testing::Test
{
    public:
        CommandLineTestBase();
        ~CommandLineTestBase();

        /*! \brief
         * Sets an input file.
         *
         * \param[in]     option    Option to set.
         * \param[in]     filename  Name of the input file.
         *
         * \see TestFileManager::getInputFilePath()
         */
        void setInputFile(const char *option, const char *filename);
        /*! \brief
         * Generates and sets an input file.
         *
         * \see CommandLineTestHelper::setInputFileContents()
         */
        void setInputFileContents(const char        *option,
                                  const char        *extension,
                                  const std::string &contents);
        /*! \brief
         * Generates and sets an input file.
         *
         * \see CommandLineTestHelper::setInputFileContents()
         */
        void setInputFileContents(const char                        *option,
                                  const char                        *extension,
                                  const ConstArrayRef<const char *> &contents);
        /*! \brief
         * Sets an output file parameter and adds it to the set of tested files.
         *
         * \see CommandLineTestHelper::setOutputFile()
         */
        void setOutputFile(const char *option, const char *filename,
                           const ITextBlockMatcherSettings &matcher);
        /*! \brief
         * Sets an output file parameter and adds it to the set of tested files.
         *
         * \see CommandLineTestHelper::setOutputFile()
         */
        void setOutputFile(const char *option, const char *filename,
                           const IFileMatcherSettings &matcher);

        /*! \brief
         * Returns the internal CommandLine object used to construct the
         * command line for the test.
         *
         * Derived test fixtures can use this to add additional options, and
         * to access the final command line to do the actual call that is being
         * tested.
         *
         * Does not throw.
         */
        CommandLine &commandLine();
        /*! \brief
         * Returns the internal TestFileManager object used to manage the
         * files.
         *
         * Derived test fixtures can use this to manage files in cases the
         * canned methods are not sufficient.
         *
         * Does not throw.
         */
        TestFileManager &fileManager();
        /*! \brief
         * Returns the root reference data checker.
         *
         * Derived test fixtures can use this to check other things than output
         * file contents.
         */
        TestReferenceChecker rootChecker();

        /*! \brief
         * Checks the output of writeHelp() against reference data.
         */
        void testWriteHelp(ICommandLineModule *module);
        /*! \brief
         * Checks output files added with setOutputFile() against reference
         * data.
         *
         * \see CommandLineTestHelper::checkOutputFiles()
         */
        void checkOutputFiles();

    private:
        class Impl;

        PrivateImplPointer<Impl> impl_;
};

} // namespace test
} // namespace gmx

#endif