diff --git a/tests/span_tests.cpp b/tests/span_tests.cpp
index edbd118..7607194 100644
--- a/tests/span_tests.cpp
+++ b/tests/span_tests.cpp
@@ -1084,6 +1084,45 @@ TEST(span_test, from_array_constructor)
      EXPECT_TRUE(cit3 == s.cend());
  }
 
+ TEST(span_test, iterator_free_functions)
+ {
+     int a[] = {1, 2, 3, 4};
+     span<int> s{a};
+ 
+     EXPECT_TRUE((std::is_same<decltype(s.begin()), decltype(begin(s))>::value));
+     EXPECT_TRUE((std::is_same<decltype(s.end()), decltype(end(s))>::value));
+ 
+     EXPECT_TRUE((std::is_same<decltype(s.cbegin()), decltype(cbegin(s))>::value));
+     EXPECT_TRUE((std::is_same<decltype(s.cend()), decltype(cend(s))>::value));
+ 
+     EXPECT_TRUE((std::is_same<decltype(s.rbegin()), decltype(rbegin(s))>::value));
+     EXPECT_TRUE((std::is_same<decltype(s.rend()), decltype(rend(s))>::value));
+ 
+     EXPECT_TRUE((std::is_same<decltype(s.crbegin()), decltype(crbegin(s))>::value));
+     EXPECT_TRUE((std::is_same<decltype(s.crend()), decltype(crend(s))>::value));
+ 
+     EXPECT_TRUE(s.begin() == begin(s));
+     EXPECT_TRUE(s.end() == end(s));
+ 
+     EXPECT_TRUE(s.cbegin() == cbegin(s));
+     EXPECT_TRUE(s.cend() == cend(s));
+ 
+     EXPECT_TRUE(s.rbegin() == rbegin(s));
+     EXPECT_TRUE(s.rend() == rend(s));
+ 
+     EXPECT_TRUE(s.crbegin() == crbegin(s));
+     EXPECT_TRUE(s.crend() == crend(s));
+ }
+
+ TEST(span_test, ssize_free_function)
+ {
+     int a[] = {1, 2, 3, 4};
+     span<int> s{a};
+ 
+     EXPECT_TRUE((std::is_same<decltype(s.size()), decltype(ssize(s))>::value));
+     EXPECT_TRUE(s.size() == ssize(s));
+ }
+
  TEST(span_test, iterator_comparisons)
  {
      int a[] = {1, 2, 3, 4};