diff --git a/tests/unit_tests/test_config_helpers.py b/tests/unit_tests/test_config_helpers.py
index 8b51a8adcd..c1f8c2bef8 100644
--- a/tests/unit_tests/test_config_helpers.py
+++ b/tests/unit_tests/test_config_helpers.py
@@ -1,5 +1,6 @@
 """Unit tests for esphome.config_helpers module."""
 
+from collections.abc import Callable
 from unittest.mock import patch
 
 from esphome.config_helpers import filter_source_files_from_platform
@@ -11,8 +12,47 @@ from esphome.const import (
 )
 
 
-def test_filter_source_files_from_platform():
-    """Test that filter_source_files_from_platform correctly filters files based on platform."""
+def test_filter_source_files_from_platform_esp32() -> None:
+    """Test that filter_source_files_from_platform correctly filters files for ESP32 platform."""
+    # Define test file mappings
+    files_map: dict[str, set[PlatformFramework]] = {
+        "logger_esp32.cpp": {
+            PlatformFramework.ESP32_ARDUINO,
+            PlatformFramework.ESP32_IDF,
+        },
+        "logger_esp8266.cpp": {PlatformFramework.ESP8266_ARDUINO},
+        "logger_host.cpp": {PlatformFramework.HOST_NATIVE},
+        "logger_common.cpp": {
+            PlatformFramework.ESP32_ARDUINO,
+            PlatformFramework.ESP32_IDF,
+            PlatformFramework.ESP8266_ARDUINO,
+            PlatformFramework.HOST_NATIVE,
+        },
+    }
+
+    # Create the filter function
+    filter_func: Callable[[], list[str]] = filter_source_files_from_platform(files_map)
+
+    # Test ESP32 with Arduino framework
+    mock_core_data: dict[str, dict[str, str]] = {
+        KEY_CORE: {
+            KEY_TARGET_PLATFORM: "esp32",
+            KEY_TARGET_FRAMEWORK: "arduino",
+        }
+    }
+
+    with patch("esphome.config_helpers.CORE.data", mock_core_data):
+        excluded = filter_func()
+        # ESP32 Arduino should exclude ESP8266 and HOST files
+        assert "logger_esp8266.cpp" in excluded
+        assert "logger_host.cpp" in excluded
+        # But not ESP32 or common files
+        assert "logger_esp32.cpp" not in excluded
+        assert "logger_common.cpp" not in excluded
+
+
+def test_filter_source_files_from_platform_host():
+    """Test that filter_source_files_from_platform correctly filters files for HOST platform."""
     # Define test file mappings
     files_map = {
         "logger_esp32.cpp": {
@@ -32,24 +72,7 @@ def test_filter_source_files_from_platform():
     # Create the filter function
     filter_func = filter_source_files_from_platform(files_map)
 
-    # Test case 1: ESP32 with Arduino framework
-    mock_core_data = {
-        KEY_CORE: {
-            KEY_TARGET_PLATFORM: "esp32",
-            KEY_TARGET_FRAMEWORK: "arduino",
-        }
-    }
-
-    with patch("esphome.config_helpers.CORE.data", mock_core_data):
-        excluded = filter_func()
-        # ESP32 Arduino should exclude ESP8266 and HOST files
-        assert "logger_esp8266.cpp" in excluded
-        assert "logger_host.cpp" in excluded
-        # But not ESP32 or common files
-        assert "logger_esp32.cpp" not in excluded
-        assert "logger_common.cpp" not in excluded
-
-    # Test case 2: Host platform
+    # Test Host platform
     mock_core_data = {
         KEY_CORE: {
             KEY_TARGET_PLATFORM: "host",
@@ -66,7 +89,19 @@ def test_filter_source_files_from_platform():
         assert "logger_host.cpp" not in excluded
         assert "logger_common.cpp" not in excluded
 
-    # Test case 3: Missing platform/framework data
+
+def test_filter_source_files_from_platform_handles_missing_data():
+    """Test that filter_source_files_from_platform returns empty list when platform/framework data is missing."""
+    # Define test file mappings
+    files_map = {
+        "logger_esp32.cpp": {PlatformFramework.ESP32_ARDUINO},
+        "logger_host.cpp": {PlatformFramework.HOST_NATIVE},
+    }
+
+    # Create the filter function
+    filter_func = filter_source_files_from_platform(files_map)
+
+    # Test case: Missing platform/framework data
     mock_core_data = {KEY_CORE: {}}
 
     with patch("esphome.config_helpers.CORE.data", mock_core_data):
diff --git a/tests/unit_tests/test_loader.py b/tests/unit_tests/test_loader.py
index 24c8464aa4..c6d4c4aef0 100644
--- a/tests/unit_tests/test_loader.py
+++ b/tests/unit_tests/test_loader.py
@@ -5,7 +5,7 @@ from unittest.mock import MagicMock, patch
 from esphome.loader import ComponentManifest
 
 
-def test_component_manifest_resources_with_filter_source_files():
+def test_component_manifest_resources_with_filter_source_files() -> None:
     """Test that ComponentManifest.resources correctly filters out excluded files."""
     # Create a mock module with FILTER_SOURCE_FILES function
     mock_module = MagicMock()
@@ -19,7 +19,7 @@ def test_component_manifest_resources_with_filter_source_files():
     manifest = ComponentManifest(mock_module)
 
     # Mock the files in the package
-    def create_mock_file(filename):
+    def create_mock_file(filename: str) -> MagicMock:
         mock_file = MagicMock()
         mock_file.name = filename
         mock_file.is_file.return_value = True