diff --git a/tests/unit_tests/test_espota2.py b/tests/unit_tests/test_espota2.py
index e1b3de6f97..6bfd20a0b2 100644
--- a/tests/unit_tests/test_espota2.py
+++ b/tests/unit_tests/test_espota2.py
@@ -54,6 +54,40 @@ def mock_random():
         yield mock_rand
 
 
+@pytest.fixture
+def mock_resolve_ip():
+    """Mock resolve_ip_address for testing."""
+    with patch("esphome.espota2.resolve_ip_address") as mock:
+        mock.return_value = [
+            (socket.AF_INET, socket.SOCK_STREAM, 0, "", ("192.168.1.100", 3232))
+        ]
+        yield mock
+
+
+@pytest.fixture
+def mock_perform_ota():
+    """Mock perform_ota function for testing."""
+    with patch("esphome.espota2.perform_ota") as mock:
+        yield mock
+
+
+@pytest.fixture
+def mock_run_ota_impl():
+    """Mock run_ota_impl_ function for testing."""
+    with patch("esphome.espota2.run_ota_impl_") as mock:
+        mock.return_value = (0, "192.168.1.100")
+        yield mock
+
+
+@pytest.fixture
+def mock_open_file():
+    """Mock file opening for testing."""
+    with patch("builtins.open", create=True) as mock_open:
+        mock_file = MagicMock()
+        mock_open.return_value.__enter__.return_value = mock_file
+        yield mock_open, mock_file
+
+
 def test_recv_decode_with_decode(mock_socket) -> None:
     """Test recv_decode with decode=True returns list."""
     mock_socket.recv.return_value = b"\x01\x02\x03"
@@ -365,26 +399,25 @@ def test_perform_ota_upload_error(mock_socket) -> None:
             espota2.perform_ota(mock_socket, "", mock_file, "test.bin")
 
 
-def test_run_ota_impl_successful() -> None:
+def test_run_ota_impl_successful(mock_socket, tmp_path) -> None:
     """Test run_ota_impl_ with successful upload."""
-    mock_socket = Mock()
+    # Create a real firmware file
+    firmware_file = tmp_path / "firmware.bin"
+    firmware_file.write_bytes(b"firmware content")
 
     with (
         patch("socket.socket", return_value=mock_socket),
         patch("esphome.espota2.resolve_ip_address") as mock_resolve,
-        patch("builtins.open", create=True) as mock_open,
         patch("esphome.espota2.perform_ota") as mock_perform,
     ):
         # Setup mocks
         mock_resolve.return_value = [
             (socket.AF_INET, socket.SOCK_STREAM, 0, "", ("192.168.1.100", 3232))
         ]
-        mock_file = MagicMock()
-        mock_open.return_value.__enter__.return_value = mock_file
 
-        # Run OTA
+        # Run OTA with real file path
         result_code, result_host = espota2.run_ota_impl_(
-            "test.local", 3232, "password", "firmware.bin"
+            "test.local", 3232, "password", str(firmware_file)
         )
 
         # Verify success
@@ -396,17 +429,24 @@ def test_run_ota_impl_successful() -> None:
         mock_socket.connect.assert_called_once_with(("192.168.1.100", 3232))
         mock_socket.close.assert_called_once()
 
-        # Verify perform_ota was called
-        mock_perform.assert_called_once_with(
-            mock_socket, "password", mock_file, "firmware.bin"
-        )
+        # Verify perform_ota was called with real file
+        mock_perform.assert_called_once()
+        call_args = mock_perform.call_args[0]
+        assert call_args[0] == mock_socket
+        assert call_args[1] == "password"
+        # The file object should be opened
+        assert hasattr(call_args[2], "read")
+        assert call_args[3] == str(firmware_file)
 
 
-def test_run_ota_impl_connection_failed() -> None:
+def test_run_ota_impl_connection_failed(mock_socket, tmp_path) -> None:
     """Test run_ota_impl_ when connection fails."""
-    mock_socket = Mock()
     mock_socket.connect.side_effect = OSError("Connection refused")
 
+    # Create a real firmware file
+    firmware_file = tmp_path / "firmware.bin"
+    firmware_file.write_bytes(b"firmware content")
+
     with (
         patch("socket.socket", return_value=mock_socket),
         patch("esphome.espota2.resolve_ip_address") as mock_resolve,
@@ -416,7 +456,7 @@ def test_run_ota_impl_connection_failed() -> None:
         ]
 
         result_code, result_host = espota2.run_ota_impl_(
-            "test.local", 3232, "password", "firmware.bin"
+            "test.local", 3232, "password", str(firmware_file)
         )
 
         assert result_code == 1
@@ -424,14 +464,18 @@ def test_run_ota_impl_connection_failed() -> None:
         mock_socket.close.assert_called_once()
 
 
-def test_run_ota_impl_resolve_failed() -> None:
+def test_run_ota_impl_resolve_failed(tmp_path) -> None:
     """Test run_ota_impl_ when DNS resolution fails."""
+    # Create a real firmware file
+    firmware_file = tmp_path / "firmware.bin"
+    firmware_file.write_bytes(b"firmware content")
+
     with patch("esphome.espota2.resolve_ip_address") as mock_resolve:
         mock_resolve.side_effect = EsphomeError("DNS resolution failed")
 
         with pytest.raises(espota2.OTAError, match="DNS resolution failed"):
             result_code, result_host = espota2.run_ota_impl_(
-                "unknown.host", 3232, "password", "firmware.bin"
+                "unknown.host", 3232, "password", str(firmware_file)
             )
 
 
@@ -484,9 +528,8 @@ def test_progress_bar(capsys: CaptureFixture[str]) -> None:
 
 
 # Tests for SHA256 authentication (for when PR is merged)
-def test_perform_ota_successful_sha256_auth() -> None:
+def test_perform_ota_successful_sha256_auth(mock_socket) -> None:
     """Test successful OTA with SHA256 authentication (future support)."""
-    mock_socket = Mock()
 
     # Mock random for predictable cnonce
     with patch("random.random", return_value=0.123456):