Add some basic tests

Makefile.am

@@ -25,3 +25,20 @@ rastertobrlaser_LDADD = $(CUPS_LIBS)
 
 brdecode_SOURCES = \
 	src/brdecode.cc
+
+
+TESTS = test_lest test_line test_block
+check_PROGRAMS = $(TESTS)
+test_lest_SOURCES = \
+	test/test_lest.cc \
+	test/lest.h
+test_line_SOURCES = \
+	test/test_line.cc \
+	src/line.h \
+	src/line.cc \
+	test/lest.h
+test_block_SOURCES = \
+	test/test_block.cc \
+	src/block.h \
+	test/tempfile.h \
+	test/lest.h

test/lest.hpp

@@ -0,0 +1,197 @@
+// Copyright 2013 by Martin Moene
+//
+// lest is based on ideas by Kevlin Henney, see video at
+// http://skillsmatter.com/podcast/agile-testing/kevlin-henney-rethinking-unit-testing-in-c-plus-plus
+//
+// Distributed under the Boost Software License, Version 1.0:
+// 
+// Permission is hereby granted, free of charge, to any person or organization
+// obtaining a copy of the software and accompanying documentation covered by
+// this license (the "Software") to use, reproduce, display, distribute,
+// execute, and transmit the Software, and to prepare derivative works of the
+// Software, and to permit third-parties to whom the Software is furnished to
+// do so, all subject to the following:
+// 
+// The copyright notices in the Software and this entire statement, including
+// the above license grant, this restriction and the following disclaimer,
+// must be included in all copies of the Software, in whole or in part, and
+// all derivative works of the Software, unless such copies or derivative
+// works are solely in the form of machine-executable object code generated by
+// a source language processor.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef LEST_LEST_H_INCLUDED
+#define LEST_LEST_H_INCLUDED
+
+#include <functional>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <cstddef>
+
+#ifndef lest_NO_SHORT_ASSERTION_NAMES
+# define EXPECT           lest_EXPECT
+# define EXPECT_THROWS    lest_EXPECT_THROWS
+# define EXPECT_THROWS_AS lest_EXPECT_THROWS_AS
+#endif
+
+#define lest_EXPECT( expr ) \
+    try \
+    { \
+        if ( ! (expr) ) \
+            throw lest::failure{ lest_LOCATION, #expr }; \
+    } \
+    catch( lest::failure const & ) \
+    { \
+        throw ; \
+    } \
+    catch( std::exception const & e ) \
+    { \
+        throw lest::unexpected{ lest_LOCATION, #expr, lest::with_message( e.what() ) }; \
+    } \
+    catch(...) \
+    { \
+        throw lest::unexpected{ lest_LOCATION, #expr, "of unknown type" }; \
+    }
+
+#define lest_EXPECT_THROWS( expr ) \
+    for (;;) \
+    { \
+        try { lest::serum( expr ); } catch (...) { break; } \
+        throw lest::expected{ lest_LOCATION, #expr }; \
+    }
+
+#define lest_EXPECT_THROWS_AS( expr, excpt ) \
+    for (;;) \
+    { \
+        try { lest::serum( expr ); } catch ( excpt & ) { break; } catch (...) {} \
+        throw lest::expected{ lest_LOCATION, #expr, lest::of_type( #excpt ) }; \
+    }
+
+#define lest_LOCATION lest::location{__FILE__, __LINE__}
+
+namespace lest {
+
+struct test
+{
+    const std::string name;
+    const std::function<void()> behaviour;
+};
+
+struct location
+{
+    const std::string file;
+    const int line;
+
+    location( std::string file, int line )
+    : file{ file }, line{ line } {}
+};
+
+struct comment
+{
+    const std::string text;
+
+    comment( std::string text ) : text{ text } {}
+    explicit operator bool() { return ! text.empty(); }
+};
+
+struct message : std::runtime_error
+{
+    const std::string kind;
+    const location where;
+    const comment note;
+
+    message( std::string kind, location where, std::string expr, std::string note = "" )
+    : std::runtime_error{ expr }, kind{ kind }, where{ where }, note{ note } {}
+};
+
+struct failure : message
+{
+    failure( location where, std::string expr )
+    : message{ "failed", where, expr } {}
+};
+
+struct expected : message
+{
+    expected( location where, std::string expr, std::string excpt = "" )
+    : message{ "failed: didn't get exception", where, expr, excpt } {}
+};
+
+struct unexpected : message
+{
+    unexpected( location where, std::string expr, std::string note )
+    : message{ "failed: got unexpected exception", where, expr, note } {}
+};
+
+inline bool serum( bool verum ) { return verum; }
+
+inline std::string with_message( std::string text )
+{
+    return "with message \"" + text + "\"";
+}
+
+inline std::string of_type( std::string text )
+{
+    return "of type " + text;
+}
+
+inline std::string pluralise( int n, std::string text )
+{
+    return n == 1 ? text : text + "s";
+}
+
+inline std::ostream & operator<<( std::ostream & os, comment note )
+{
+    return os << (note ? " " + note.text : "" );
+}
+
+inline std::ostream & operator<<( std::ostream & os, location where )
+{
+#ifdef __GNUG__
+    return os << where.file << ":" << where.line;
+#else
+    return os << where.file << "(" << where.line << ")";
+#endif
+}
+
+inline void report( std::ostream & os, message const & e, std::string test )
+{
+    os << e.where << ": " << e.kind << e.note << ": " << test << ": " << e.what() << std::endl;
+}
+
+template<std::size_t N>
+int run( test const (&specification)[N], std::ostream & os = std::cout )
+{
+    int failures = 0;
+
+    for ( auto & testing : specification )
+    {
+        try
+        {
+            testing.behaviour();
+        }
+        catch( message const & e )
+        {
+            ++failures;
+            report( os, e, testing.name );
+        }
+    }
+
+    if ( failures > 0 )
+    {
+        os << failures << " out of " << N << " " << pluralise(N, "test") << " failed." << std::endl;
+    }
+
+    return failures;
+}
+
+} // namespace lest
+
+#endif // LEST_LEST_H_INCLUDED

test/tempfile.h

@@ -0,0 +1,54 @@
+// This file is part of the brlaser printer driver.
+//
+// Copyright 2014 Peter De Wachter
+//
+// brlaser is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 2 of the License, or
+// (at your option) any later version.
+//
+// brlaser is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with brlaser.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef TEMPFILE_H
+#define TEMPFILE_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <vector>
+
+class tempfile {
+ public:
+  explicit tempfile()
+      : ptr_(0),
+        size_(0),
+        file_(open_memstream(&ptr_, &size_)) {
+  }
+
+  ~tempfile() {
+    fclose(file_);
+    free(ptr_);
+  }
+
+  FILE *file() {
+    return file_;
+  }
+
+  std::vector<uint8_t> data() {
+    if (fflush(file_))
+      return std::vector<uint8_t>();
+    return std::vector<uint8_t>(ptr_, ptr_ + size_);
+  }
+
+ private:
+  char *ptr_;
+  size_t size_;
+  FILE *file_;
+};
+
+#endif  // TEMPFILE_H

test/test_block.cc

@@ -0,0 +1,75 @@
+// This file is part of the brlaser printer driver.
+//
+// Copyright 2014 Peter De Wachter
+//
+// brlaser is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 2 of the License, or
+// (at your option) any later version.
+//
+// brlaser is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with brlaser.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "lest.hpp"
+#include <stdint.h>
+#include <vector>
+#include "tempfile.h"
+#include "src/block.h"
+
+typedef std::vector<uint8_t> vec;
+
+const lest::test specification[] = {
+  "Block line limit",
+  [] {
+    block b;
+    for (int i = 0; i < 128; ++i) {
+      EXPECT(b.line_fits(1));
+      b.add_line(vec(1));
+    }
+    EXPECT(!b.line_fits(1));
+  },
+
+  "Block size limit",
+  [] {
+    block b;
+    for (int i = 0; i < 16; ++i) {
+      EXPECT(b.line_fits(1000));
+      b.add_line(vec(1000));
+    }
+    EXPECT(!b.line_fits(400));
+  },
+
+  "Flush",
+  [] {
+    block b;
+    {
+      tempfile f;
+      b.flush(f.file());
+      EXPECT(f.data().empty());
+    }
+    for (uint8_t n = 0; n < 10; n += 2) {
+      vec line = {n, static_cast<uint8_t>(n+1)};
+      EXPECT(b.line_fits(line.size()));
+      b.add_line(std::move(line));
+    }
+    {
+      tempfile f;
+      b.flush(f.file());
+      EXPECT(( f.data() == vec{'1','2','w',0,5,0,1,2,3,4,5,6,7,8,9} ));
+    }
+    {
+      tempfile f;
+      b.flush(f.file());
+      EXPECT(f.data().empty());
+    }
+  },
+};
+
+int main() {
+  return lest::run(specification);
+}