diff --git a/algorithms/graph/bipartile/max_bipartile_matching.py b/algorithms/graph/bipartile/max_bipartile_matching.py
index c138afd..a7cff2d 100644
--- a/algorithms/graph/bipartile/max_bipartile_matching.py
+++ b/algorithms/graph/bipartile/max_bipartile_matching.py
@@ -125,7 +125,7 @@ def test_graph_with_multiple_matchings(self):
         expected1 = {"U1": "V1", "U2": "V2", "U3": "V3"}
         expected2 = {"U1": "V2", "U2": "V1", "U3": "V3"}
         result = max_bipartite_matching(graph)
-        self.assertIn(result, [expected1, expected2])
+        self.assertTrue(result in [expected1, expected2])
 
 
 if __name__ == "__main__":
diff --git a/algorithms/graph/cyclic/shortest_weighted_cycle.py b/algorithms/graph/cyclic/shortest_weighted_cycle.py
index 858d139..ebb52c8 100644
--- a/algorithms/graph/cyclic/shortest_weighted_cycle.py
+++ b/algorithms/graph/cyclic/shortest_weighted_cycle.py
@@ -99,8 +99,8 @@ def test_remove_edge(self):
 
     def test_add_edge(self):
         self.g.add_edge(2, 5, 4)
-        self.assertIn((5, 4), self.g.adj[2])
-        self.assertIn((2, 4), self.g.adj[5])
+        self.assertTrue((5, 4) in self.g.adj[2])
+        self.assertTrue((2, 4) in self.g.adj[5])
 
 
 if __name__ == "__main__":
diff --git a/algorithms/graph/graph_representation/basic_graph.py b/algorithms/graph/graph_representation/basic_graph.py
index e10896f..899f55e 100644
--- a/algorithms/graph/graph_representation/basic_graph.py
+++ b/algorithms/graph/graph_representation/basic_graph.py
@@ -160,7 +160,7 @@ def test_neighbors(self):
 
     def test_add_vertex(self):
         self.graph.add_vertex("C")
-        self.assertIn("C", self.graph.vertices)
+        self.assertTrue("C" in self.graph.vertices)
 
     def test_remove_vertex(self):
         self.graph.remove_vertex("B")
diff --git a/algorithms/graph/graph_representation/oo.py b/algorithms/graph/graph_representation/oo.py
index 4a5fd21..ac5900d 100644
--- a/algorithms/graph/graph_representation/oo.py
+++ b/algorithms/graph/graph_representation/oo.py
@@ -29,8 +29,8 @@ def test_add_vertex(self):
         g.add_vertex(a)
         g.add_vertex(b)
         self.assertEqual(len(g.graph_dict), 2)
-        self.assertIn("A", g.graph_dict)
-        self.assertIn("B", g.graph_dict)
+        self.assertTrue("A" in g.graph_dict)
+        self.assertTrue("B" in g.graph_dict)
 
     def test_add_edge(self):
         g = Graph()
@@ -39,7 +39,7 @@ def test_add_edge(self):
         g.add_vertex(a)
         g.add_vertex(b)
         g.add_edge("A", "B", 1)
-        self.assertIn("B", g.graph_dict["A"].edges)
+        self.assertTrue("B" in g.graph_dict["A"].edges)
         self.assertEqual(g.graph_dict["A"].edges["B"], 1)
 
 
diff --git a/algorithms/searching/interpolation_search.py b/algorithms/searching/interpolation_search.py
index d5aaa2a..9adce7e 100644
--- a/algorithms/searching/interpolation_search.py
+++ b/algorithms/searching/interpolation_search.py
@@ -38,7 +38,7 @@ def test_duplicate_elements(self):
         arr = [1, 2, 3, 4, 4, 5, 6]
         x = 4
         result = interpolation_search(arr, x)
-        self.assertIn(result, [3, 4], "Incorrect result with duplicate elements")
+        self.assertTrue(result in [3, 4], "Incorrect result with duplicate elements")
 
 
 if __name__ == "__main__":
diff --git a/algorithms/searching/linear_search.py b/algorithms/searching/linear_search.py
index 5791b03..37fcbf1 100644
--- a/algorithms/searching/linear_search.py
+++ b/algorithms/searching/linear_search.py
@@ -31,7 +31,7 @@ def test_duplicate_elements(self):
         arr = [1, 2, 3, 4, 4, 5, 6]
         x = 4
         result = linear_search(arr, x)
-        self.assertIn(result, [3, 4], "Incorrect result with duplicate elements")
+        self.assertTrue(result in [3, 4], "Incorrect result with duplicate elements")
 
 
 if __name__ == "__main__":
diff --git a/data_structures/graphs/graph.py b/data_structures/graphs/graph.py
index 2677c5d..735774d 100644
--- a/data_structures/graphs/graph.py
+++ b/data_structures/graphs/graph.py
@@ -38,11 +38,11 @@ def setUp(self):
 
     def test_add_vertex(self):
         self.graph.add_vertex(4)
-        self.assertIn(4, self.graph.get_vertices())
+        self.assertTrue(4 in self.graph.get_vertices())
 
     def test_add_edge(self):
         self.graph.add_edge(3, 1)
-        self.assertIn(1, self.graph.get_edges()[3])
+        self.assertTrue(1 in self.graph.get_edges()[3])
 
     def test_get_vertices(self):
         self.assertEqual(self.graph.get_vertices(), [1, 2, 3])
diff --git a/data_structures/graphs/weighted_graph.py b/data_structures/graphs/weighted_graph.py
index 2407dfb..0275b65 100644
--- a/data_structures/graphs/weighted_graph.py
+++ b/data_structures/graphs/weighted_graph.py
@@ -33,11 +33,11 @@ def setUp(self):
 
     def test_add_vertex(self):
         self.graph.add_vertex(4)
-        self.assertIn(4, self.graph.get_vertices())
+        self.assertTrue(4 in self.graph.get_vertices())
 
     def test_add_edge(self):
         self.graph.add_edge(3, 1, 30)
-        self.assertIn(1, self.graph.get_edges()[3])
+        self.assertTrue(1 in self.graph.get_edges()[3])
         self.assertEqual(self.graph.get_edges()[3][1], 30)
 
     def test_get_vertices(self):
diff --git a/data_structures/map/map.py b/data_structures/map/map.py
index 311e855..dd7a85a 100644
--- a/data_structures/map/map.py
+++ b/data_structures/map/map.py
@@ -111,7 +111,7 @@ def test_len(self):
     def test_iter(self):
         keys = {"a", "b", "c"}
         for k, _v in self.m:
-            self.assertIn(k, keys)
+            self.assertTrue(k in keys)
 
     def test_str(self):
         self.assertEqual(str(self.m), "{a: 1, b: 2, c: 3}")