Attempt to fix failing Windows XCppTests

Author: mcbarton

test/test_xcpp_kernel.py

@@ -127,11 +127,91 @@ class XCppTests(jupyter_kernel_test.KernelTests):
     }
     #include "xcpp/xdisplay.hpp"
     im::image marie("../notebooks/images/marie.png");
-    xcpp::display(marie);""",
+    xcpp::display(marie);
+    """,
                 'mime': 'image/png'
             }
         ]
 
+if platform.system() == 'Windows':
+    class XCppTests(jupyter_kernel_test.KernelTests):
+
+        kernel_name = 'xcpp20'
+
+        # language_info.name in a kernel_info_reply should match this
+        language_name = 'C++'
+
+        # Code that should write the exact string `hello, world` to STDOUT
+        code_hello_world = """
+        #include "stdafx.h"
+        #include <iostream>
+        std::cout << "hello, world" << std::endl;
+        """
+
+        # Code that should cause (any) text to be written to STDERR
+        code_stderr = """
+        #include "stdafx.h"
+        #include <iostream>
+        std::cerr << "oops" << std::endl;"""
+
+        # Pager: code that should display something (anything) in the pager
+        code_page_something = "?std::vector"
+
+        # Exception throwing
+        # TODO: Remove 'if' when test work on MacOS/arm64. Throw Exceptions make
+        # kernel/test non-workable.
+        ###code_generate_error = 'throw std::runtime_error("Unknown exception");' if platform.system() != "Darwin" or platform.processor() != 'arm' else ''
+
+        # Samples of code which generate a result value (ie, some text
+        # displayed as Out[n])
+        #code_execute_result = [
+        #    {
+        #        'code': '6 * 7',
+        #        'result': '42'
+        #    }
+        #]
+
+        # Samples of code which should generate a rich display output, and
+        # the expected MIME type
+        code_display_data = [
+            {
+                'code': """
+                #include "stdafx.h"
+                #include <string>
+                #include "xcpp/xdisplay.hpp"
+                std::string test("foobar");
+                xcpp::display(test);
+                """,
+                'mime': 'text/plain'
+            },
+            {
+                'code': """
+    #include "stdafx.h"
+    #include <string>
+    #include <fstream>
+    #include "nlohmann/json.hpp"
+    #include "xtl/xbase64.hpp"
+    namespace im {
+      struct image {
+        inline image(const std::string& filename) {
+          std::ifstream fin(filename, std::ios::binary);
+          m_buffer << fin.rdbuf();
+        }
+        std::stringstream m_buffer;
+      };
+      nlohmann::json mime_bundle_repr(const image& i) {
+        auto bundle = nlohmann::json::object();
+        bundle["image/png"] = xtl::base64encode(i.m_buffer.str());
+        return bundle;
+      }
+    }
+    #include "xcpp/xdisplay.hpp"
+    im::image marie("../notebooks/images/marie.png");
+    xcpp::display(marie);
+    """,
+                'mime': 'image/png'
+            }
+        ]
 
 class XCppTests2(jupyter_kernel_test.KernelTests):