diff --git a/project_euler/problem_001/sol1.py b/project_euler/problem_001/sol1.py
index fcc24c86ec54..384add445b0f 100644
--- a/project_euler/problem_001/sol1.py
+++ b/project_euler/problem_001/sol1.py
@@ -31,3 +31,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol2.py b/project_euler/problem_001/sol2.py
index 7093d3513378..8c92c7b3b863 100644
--- a/project_euler/problem_001/sol2.py
+++ b/project_euler/problem_001/sol2.py
@@ -36,3 +36,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol3.py b/project_euler/problem_001/sol3.py
index 8267fec84155..7302225d692b 100644
--- a/project_euler/problem_001/sol3.py
+++ b/project_euler/problem_001/sol3.py
@@ -62,3 +62,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol4.py b/project_euler/problem_001/sol4.py
index a0643c05b34f..502f0ac85ed0 100644
--- a/project_euler/problem_001/sol4.py
+++ b/project_euler/problem_001/sol4.py
@@ -50,3 +50,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol5.py b/project_euler/problem_001/sol5.py
index 3edc6f245a67..97f684472e08 100644
--- a/project_euler/problem_001/sol5.py
+++ b/project_euler/problem_001/sol5.py
@@ -30,3 +30,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol6.py b/project_euler/problem_001/sol6.py
index 8ddce18ced04..e3aa159e087e 100644
--- a/project_euler/problem_001/sol6.py
+++ b/project_euler/problem_001/sol6.py
@@ -37,3 +37,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()
diff --git a/project_euler/problem_001/sol7.py b/project_euler/problem_001/sol7.py
index 6ada70c12dbd..63d9a851e8be 100644
--- a/project_euler/problem_001/sol7.py
+++ b/project_euler/problem_001/sol7.py
@@ -33,3 +33,6 @@ def solution(n: int = 1000) -> int:
 
 if __name__ == "__main__":
     print(f"{solution() = }")
+    from doctest import testmod
+
+    testmod()