Merge pull request #319 from PureAbstract/to_string_tests

To string tests

projects/CMake/CMakeLists.txt

@@ -21,6 +21,10 @@ set(SOURCES
     ${SELF_TEST_DIR}/TestMain.cpp
     ${SELF_TEST_DIR}/TrickyTests.cpp
     ${SELF_TEST_DIR}/VariadicMacrosTests.cpp
+    ${SELF_TEST_DIR}/EnumToString.cpp
+    ${SELF_TEST_DIR}/ToStringPair.cpp
+    ${SELF_TEST_DIR}/ToStringVector.cpp
+    ${SELF_TEST_DIR}/ToStringWhich.cpp
 )
 
 # configure the executable

projects/SelfTest/ToStringPair.cpp

@@ -0,0 +1,51 @@
+#include "catch.hpp"
+
+// === Pair ===
+namespace Catch {
+    // Note: If we put this in the right place in catch_tostring, then
+    // we can make it an overload of Catch::toString
+    template<typename T1, typename T2>
+    struct StringMaker<std::pair<T1,T2> > {
+        static std::string convert( const std::pair<T1,T2>& pair ) {
+            std::ostringstream oss;
+            oss << "{ "
+                << toString( pair.first )
+                << ", "
+                << toString( pair.second )
+                << " }";
+            return oss.str();
+        }
+    };
+}
+
+TEST_CASE( "std::pair<int,std::string> -> toString", "[toString][pair]" )
+{
+    std::pair<int,std::string> value( 34, "xyzzy" );
+    REQUIRE( Catch::toString( value ) == "{ 34, \"xyzzy\" }" );
+}
+
+TEST_CASE( "std::pair<int,const std::string> -> toString", "[toString][pair]" )
+{
+    std::pair<int,const std::string> value( 34, "xyzzy" );
+    REQUIRE( Catch::toString(value) == "{ 34, \"xyzzy\" }" );
+}
+
+TEST_CASE( "std::vector<std::pair<std::string,int> > -> toString", "[toString][pair]" )
+{
+    std::vector<std::pair<std::string,int> > pr;
+    pr.push_back( std::make_pair("green", 55 ) );
+    REQUIRE( Catch::toString( pr ) == "{ { \"green\", 55 } }" );
+}
+
+// This is pretty contrived - I figure if this works, anything will...
+TEST_CASE( "pair<pair<int,const char *,pair<std::string,int> > -> toString", "[toString][pair]" )
+{
+    typedef std::pair<int,const char *> left_t;
+    typedef std::pair<std::string,int> right_t;
+
+    left_t  left( 42, "Arthur" );
+    right_t right( "Ford", 24 );
+
+    std::pair<left_t,right_t> pair( left, right );
+    REQUIRE( Catch::toString( pair ) == "{ { 42, \"Arthur\" }, { \"Ford\", 24 } }" );
+}

projects/SelfTest/ToStringVector.cpp

@@ -0,0 +1,72 @@
+#include "catch.hpp"
+#include <vector>
+
+
+// vedctor
+TEST_CASE( "vector<int> -> toString", "[toString][vector]" )
+{
+    std::vector<int> vv;
+    REQUIRE( Catch::toString(vv) == "{  }" );
+    vv.push_back( 42 );
+    REQUIRE( Catch::toString(vv) == "{ 42 }" );
+    vv.push_back( 512 );
+    REQUIRE( Catch::toString(vv) == "{ 42, 512 }" );
+}
+
+TEST_CASE( "vector<string> -> toString", "[toString][vector]" )
+{
+    std::vector<std::string> vv;
+    REQUIRE( Catch::toString(vv) == "{  }" );
+    vv.push_back( "hello" );
+    REQUIRE( Catch::toString(vv) == "{ \"hello\" }" );
+    vv.push_back( "world" );
+    REQUIRE( Catch::toString(vv) == "{ \"hello\", \"world\" }" );
+}
+
+#if defined(CATCH_CPP11_OR_GREATER)
+/*
+  Note: These tests *can* be made to work with C++ < 11, but the
+  allocator is a lot more work...
+*/
+namespace {
+    /* Minimal Allocator */
+    template<typename T>
+    struct minimal_allocator {
+        typedef T value_type;
+        typedef std::size_t size_type;
+        T *allocate( size_type n )
+        {
+            return static_cast<T *>( ::operator new( n * sizeof(T) ) );
+        }
+        void deallocate( T *p, size_type /*n*/ )
+        {
+            ::operator delete( static_cast<void *>(p) );
+        }
+        template<typename U>
+        bool operator==( const minimal_allocator<U>& ) const { return true; }
+        template<typename U>
+        bool operator!=( const minimal_allocator<U>& ) const { return false; }
+    };
+}
+
+TEST_CASE( "vector<int,allocator> -> toString", "[toString][vector,allocator]" )
+{
+    std::vector<int,minimal_allocator<int> > vv;
+    REQUIRE( Catch::toString(vv) == "{  }" );
+    vv.push_back( 42 );
+    REQUIRE( Catch::toString(vv) == "{ 42 }" );
+    vv.push_back( 512 );
+    REQUIRE( Catch::toString(vv) == "{ 42, 512 }" );
+}
+
+TEST_CASE( "vec<vec<string,alloc>> -> toString", "[toString][vector,allocator]" )
+{
+    typedef std::vector<std::string,minimal_allocator<std::string> > inner;
+    typedef std::vector<inner> vector;
+    vector v;
+    REQUIRE( Catch::toString(v) == "{  }" );
+    v.push_back( inner { "hello" } );
+    v.push_back( inner { "world" } );
+    REQUIRE( Catch::toString(v) == "{ { \"hello\" }, { \"world\" } }" );
+}
+#endif

projects/SelfTest/ToStringWhich.cpp

@@ -0,0 +1,74 @@
+#include "catch.hpp"
+/*
+    Demonstrate which version of toString/StringMaker is being used
+    for various types
+*/
+
+
+struct has_toString { };
+struct has_maker {};
+struct has_maker_and_toString {};
+
+namespace Catch {
+    std::string toString( const has_toString& ) {
+        return "toString( has_toString )";
+    }
+    std::string toString( const has_maker_and_toString& ) {
+        return "toString( has_maker_and_toString )";
+    }
+    template<>
+    struct StringMaker<has_maker> {
+        static std::string convert( const has_maker& ) {
+            return "StringMaker<has_maker>";
+        }
+    };
+    template<>
+    struct StringMaker<has_maker_and_toString> {
+        static std::string convert( const has_maker_and_toString& ) {
+            return "StringMaker<has_maker_and_toString>";
+        }
+    };
+}
+
+// Call the overload
+TEST_CASE( "toString( has_toString )", "[toString]" )
+{
+    has_toString item;
+    REQUIRE( Catch::toString( item ) == "toString( has_toString )" );
+}
+
+// Call the overload
+TEST_CASE( "toString( has_maker )", "[toString]" )
+{
+    has_maker item;
+    REQUIRE( Catch::toString( item ) == "StringMaker<has_maker>" );
+}
+
+// Call the overload
+TEST_CASE( "toString( has_maker_and_toString )", "[toString]" )
+{
+    has_maker_and_toString item;
+    REQUIRE( Catch::toString( item ) == "toString( has_maker_and_toString )" );
+}
+
+// Vectors...
+TEST_CASE( "toString( vectors<has_toString )", "[toString]" )
+{
+    std::vector<has_toString> v(1);
+    // This invokes template<T> toString which actually gives us '{ ? }'
+    REQUIRE( Catch::toString( v ) == "{ {?} }" );
+}
+
+TEST_CASE( "toString( vectors<has_maker )", "[toString]" )
+{
+    std::vector<has_maker> v(1);
+    REQUIRE( Catch::toString( v ) == "{ StringMaker<has_maker> }" );
+}
+
+
+TEST_CASE( "toString( vectors<has_maker_and_toString )", "[toString]" )
+{
+    std::vector<has_maker_and_toString> v(1);
+    // Note: This invokes the template<T> toString -> StringMaker
+    REQUIRE( Catch::toString( v ) == "{ StringMaker<has_maker_and_toString> }" );
+}

projects/SelfTest/makefile

@@ -9,7 +9,10 @@ SOURCES = ApproxTests.cpp \
           TrickyTests.cpp \
           BDDTests.cpp \
           VariadicMacrosTests.cpp \
-          EnumToString.cpp
+          EnumToString.cpp \
+          ToStringPair.cpp \
+          ToStringVector.cpp \
+          ToStringWhich.cpp
 
 
 OBJECTS    = $(patsubst %.cpp, %.o, $(SOURCES))