diff --git a/eo-runtime/src/test/eo/org/eolang/seq-tests.eo b/eo-runtime/src/test/eo/org/eolang/seq-tests.eo
index b696d899b2..9709c88d89 100644
--- a/eo-runtime/src/test/eo/org/eolang/seq-tests.eo
+++ b/eo-runtime/src/test/eo/org/eolang/seq-tests.eo
@@ -127,3 +127,27 @@
         TRUE
         TRUE
         TRUE
+
+# Test.
+[] > seq-single-dataization-int-equal-to-test
+  (memory 0).alloc > x
+  eq. > @
+    seq
+      *
+        x.write 0
+        x.write (x.as-int.plus 1)
+        x.as-int
+    1
+
+# Test.
+[] > seq-single-dataization-int-equal-to-cache-problem-test
+  (memory 0).alloc > x
+  eq. > @
+    seq
+      *
+        at.
+          * 0 1
+          x.as-int
+        x.write (x.as-int.plus 1)
+        x.as-int
+    1