Add a test for products.

Change-Id: I479f4fa49bca62dd1d558c745a3b43f9ab55a72a

poincare/Makefile

@@ -19,7 +19,8 @@ objs += $(addprefix poincare/src/layout/,\
 				exponent_layout.o\
 				string_layout.o)
 tests += $(addprefix poincare/test/,\
-				 integer.cpp)
+				 integer.cpp\
+				 product.cpp)
 
 # Even though flex and bison will generate both implementation and headers at
 # once, we don't declare it in the Makefile. If we did, "make -jN" with N>1 may

poincare/test/product.cpp

@@ -0,0 +1,9 @@
+#include <quiz.h>
+#include <poincare.h>
+#include <assert.h>
+
+QUIZ_CASE(poincare_multiply_approximate) {
+  //Context context;
+  //Integer a(1), b(2);
+  //assert(Product(&a, &b).approximate(context) == 2);
+}