Double-check content on failure in test_stream_io

Author: Flamefire

test/boostLocale/test/unit_test.hpp

@@ -259,7 +259,7 @@ std::string to_string(const char32_t c)
 #endif
 
 template<typename T, typename U>
-void test_impl(bool success,
+bool test_impl(bool success,
                T const& l,
                U const& r,
                const char* expr,
@@ -276,18 +276,19 @@ void test_impl(bool success,
         } else
             boost::locale::test::report_error(expr, file, line);
     }
+    return success;
 }
 
-void test_impl(bool success, const char* reason, const char* file, int line)
+bool test_impl(bool success, const char* reason, const char* file, int line)
 {
-    test_impl(success, nullptr, nullptr, reason, nullptr, file, line);
+    return test_impl(success, nullptr, nullptr, reason, nullptr, file, line);
 }
 
 #define BOOST_LOCALE_TEST_OP_IMPL(name, test_op, fail_op)                                         \
     template<typename T, typename U>                                                              \
-    void test_##name##_impl(T const& l, U const& r, const char* expr, const char* file, int line) \
+    bool test_##name##_impl(T const& l, U const& r, const char* expr, const char* file, int line) \
     {                                                                                             \
-        test_impl(l test_op r, l, r, expr, #fail_op, file, line);                                 \
+        return test_impl(l test_op r, l, r, expr, #fail_op, file, line);                          \
     }
 
 BOOST_LOCALE_TEST_OP_IMPL(eq, ==, !=)

test/test_stream_io.cpp

@@ -54,7 +54,14 @@ void test_ok(const std::string& content, const std::locale& l, std::basic_string
         }
         stream_type in_file(file_path, stream_type::in);
         in_file.imbue(l);
-        TEST_EQ(read_file<Char>(in_file), cmp);
+        if(!TEST_EQ(read_file<Char>(in_file), cmp)) {
+            // If test fails, double check the file content
+            in_file.close();
+            std::ifstream check_file(file_path, std::ios::binary);
+            std::string check_content;
+            TEST(check_file >> check_content);
+            TEST_EQ(check_content, content);
+        }
     }
 
     {