diff --git a/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.expected b/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.expected
new file mode 100644
index 00000000000..e20e20c464d
--- /dev/null
+++ b/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.expected
@@ -0,0 +1 @@
+| test_if.py:51:9:51:16 | BinaryExpr | $@ in $@ has no consecutive successor (expected 6) | test_if.py:51:15:51:15 | IntegerLiteral | Timestamp 5 | test_if.py:43:1:43:31 | Function test_if_elif_else_first | test_if_elif_else_first |
diff --git a/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.ql b/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.ql
new file mode 100644
index 00000000000..8c7a49b74fb
--- /dev/null
+++ b/python/ql/test/library-tests/ControlFlow/evaluation-order/ConsecutiveTimestamps.ql
@@ -0,0 +1,46 @@
+/**
+ * Checks that consecutive annotated nodes have consecutive timestamps:
+ * for each annotation with timestamp `a`, some CFG node for that annotation
+ * must have a next annotation containing `a + 1`.
+ *
+ * Handles CFG splitting (e.g., finally blocks duplicated for normal/exceptional
+ * flow) by checking that at least one split has the required successor.
+ *
+ * Only applies to functions where all annotations are in the function's
+ * own scope (excludes tests with generators, async, comprehensions, or
+ * lambdas that have annotations in nested scopes).
+ */
+
+import python
+import TimerUtils
+
+/**
+ * Holds if function `f` has an annotation in a nested scope
+ * (generator, async function, comprehension, lambda).
+ */
+private predicate hasNestedScopeAnnotation(TestFunction f) {
+  exists(TimerAnnotation a |
+    a.getTestFunction() = f and
+    a.getExpr().getScope() != f
+  )
+}
+
+from TimerAnnotation ann, int a
+where
+  not hasNestedScopeAnnotation(ann.getTestFunction()) and
+  not ann.isDead() and
+  a = ann.getATimestamp() and
+  not exists(TimerCfgNode x, TimerCfgNode y |
+    ann.getExpr() = x.getNode() and
+    nextTimerAnnotation(x, y) and
+    (a + 1) = y.getATimestamp()
+  ) and
+  // Exclude the maximum timestamp in the function (it has no successor)
+  not a =
+    max(TimerAnnotation other |
+      other.getTestFunction() = ann.getTestFunction()
+    |
+      other.getATimestamp()
+    )
+select ann, "$@ in $@ has no consecutive successor (expected " + (a + 1) + ")",
+  ann.getTimestampExpr(a), "Timestamp " + a, ann.getTestFunction(), ann.getTestFunction().getName()