add within

tests/meson.build

@@ -5,7 +5,16 @@ test(
   'split_str',
   executable(
     'split_str',
-    'split_str.cpp',
+    'string.cpp',
     dependencies: [ string_dep, gtest_dep ]
   )
 )
+
+test(
+  'within',
+  executable(
+    'within',
+    'range.cpp',
+    dependencies: [ range_dep, gtest_dep ]
+  )
+)

tests/range.cpp

@@ -0,0 +1,9 @@
+#include <gtest/gtest.h>
+
+#include "range/range.hpp"
+
+TEST(within, check)
+{
+  ASSERT_EQ(hack::within(23, 123, 34, 44, 55, 66), true);
+  ASSERT_EQ(hack::within(23, 123, 134, 44, 55, 66), false);
+}