A bunch of Catch::toString tests

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 } }" );
+}