diff --git a/tests/fluxion/layers/test_chain.py b/tests/fluxion/layers/test_chain.py
index 5aab79b..fea31ab 100644
--- a/tests/fluxion/layers/test_chain.py
+++ b/tests/fluxion/layers/test_chain.py
@@ -1,14 +1,32 @@
+import pytest
 import torch
 import refiners.fluxion.layers as fl
+from refiners.fluxion.context import Contexts
+
+
+class ContextChain(fl.Chain):
+    def init_context(self) -> Contexts:
+        return {"foo": {"bar": [42]}}
+
+
+def module_keys(chain: fl.Chain) -> list[str]:
+    return list(chain._modules.keys())  # type: ignore[reportPrivateUsage]
 
 
 def test_chain_find() -> None:
     chain = fl.Chain(fl.Linear(1, 1))
 
-    assert isinstance(chain.find(fl.Linear), fl.Linear)
+    assert chain.find(fl.Linear) == chain.Linear
     assert chain.find(fl.Conv2d) is None
 
 
+def test_chain_find_parent():
+    chain = fl.Chain(fl.Chain(fl.Linear(1, 1)))
+
+    assert chain.find_parent(chain.Chain.Linear) == chain.Chain
+    assert chain.find_parent(fl.Linear(1, 1)) is None
+
+
 def test_chain_slice() -> None:
     chain = fl.Chain(
         fl.Linear(1, 1),
@@ -59,21 +77,91 @@ def test_chain_layers() -> None:
     assert len(list(chain.layers(fl.Chain, recurse=True))) == 4
 
 
+def test_chain_insert() -> None:
+    parent = ContextChain(fl.Linear(1, 1), fl.Linear(1, 1))
+    child = fl.Chain()
+    parent.insert(1, child)
+
+    assert module_keys(parent) == ["Linear_1", "Chain", "Linear_2"]
+    assert child.parent == parent
+    assert child.provider.get_context("foo") == {"bar": [42]}
+
+
+def test_chain_insert_negative() -> None:
+    parent = fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1))
+    child = fl.Chain()
+    parent.insert(-2, child)
+
+    assert module_keys(parent) == ["Linear_1", "Chain", "Linear_2"]
+
+
+def test_chain_insert_after_type() -> None:
+    child = fl.Chain()
+
+    parent_1 = fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1))
+    parent_1.insert_after_type(fl.Linear, child)
+    assert module_keys(parent_1) == ["Linear_1", "Chain", "Linear_2"]
+
+    parent_2 = fl.Chain(fl.Conv2d(1, 1, 1), fl.Linear(1, 1))
+    parent_2.insert_after_type(fl.Linear, child)
+    assert module_keys(parent_2) == ["Conv2d", "Linear", "Chain"]
+
+
+def test_chain_insert_overflow() -> None:
+    # This behaves as insert() in lists in Python.
+
+    child = fl.Chain()
+
+    parent_1 = fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1))
+    parent_1.insert(42, child)
+    assert module_keys(parent_1) == ["Linear_1", "Linear_2", "Chain"]
+
+    parent_2 = fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1))
+    parent_2.insert(-42, child)
+    assert module_keys(parent_2) == ["Chain", "Linear_1", "Linear_2"]
+
+
+def test_chain_append() -> None:
+    child = fl.Chain()
+
+    parent = fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1))
+    parent.append(child)
+    assert module_keys(parent) == ["Linear_1", "Linear_2", "Chain"]
+
+
+def test_chain_pop() -> None:
+    chain = fl.Chain(fl.Linear(1, 1), fl.Conv2d(1, 1, 1), fl.Chain())
+
+    with pytest.raises(IndexError):
+        chain.pop(3)
+
+    with pytest.raises(IndexError):
+        chain.pop(-4)
+
+    assert module_keys(chain) == ["Linear", "Conv2d", "Chain"]
+    chain.pop(1)
+    assert module_keys(chain) == ["Linear", "Chain"]
+
+    chain.pop(-2)
+    assert module_keys(chain) == ["Chain"]
+
+
 def test_chain_remove() -> None:
-    chain = fl.Chain(
-        fl.Linear(1, 1),
+    child = fl.Linear(1, 1)
+
+    parent = fl.Chain(
         fl.Linear(1, 1),
+        child,
         fl.Chain(fl.Linear(1, 1), fl.Linear(1, 1)),
     )
 
-    assert len(chain) == 3
-    assert "Linear_1" in chain._modules
-    assert "Linear" not in chain._modules
+    assert child in parent
+    assert module_keys(parent) == ["Linear_1", "Linear_2", "Chain"]
 
-    chain.remove(chain.Linear_2)
-    assert len(chain) == 2
-    assert "Linear" in chain._modules
-    assert "Linear_1" not in chain._modules
+    parent.remove(child)
+
+    assert child not in parent
+    assert module_keys(parent) == ["Linear", "Chain"]
 
 
 def test_chain_replace() -> None: