add exhaustive Bitmask::has_true() test

test_scripts/bitstream_unit_test.cpp

@@ -412,6 +412,33 @@ TEST(Bitmask, has_true_remaining)
   EXPECT_EQ(mask.has_true(1, 260), true);
 }
 
+TEST(Bitmask, has_true_exhaustive)
+{
+  const size_t mask_size = 130;
+
+  // Loop over all positions
+  for (size_t idx = 0; idx < mask_size; idx++) {
+    auto mask = Mask(mask_size);
+    mask.wtrue(idx);
+
+    // Loop over all starting positions
+    for (size_t start = 0; start < mask_size; start++) {
+
+      // Loop over all range length
+      for (size_t len = 0; len < mask_size - start; len++) {
+        bool ans1 = mask.has_true(start, len);
+        bool ans2 = false;
+        for (size_t i = start; i < start + len; i++)
+          if (mask.rbit(i)) {
+            ans2 = true;
+            break;
+          }
+        EXPECT_EQ(ans1, ans2);
+      }
+
+    }
+  }
+}
 
 #if defined __cpp_lib_three_way_comparison && defined __cpp_impl_three_way_comparison
 TEST(Bitmask, spaceship)