Add unit tests

CHANGELOG.md

@@ -1,15 +1,15 @@
-0.4.0 (unreleased)
+0.4.0
 =====
 - Add custom MposKeyboard with more than 50% bigger buttons, great for tiny touch screens!
 - Apply theme changes (dark mode, color) immediately after saving
 - About app: add a bit more info
-- Camera app: fix one-in-two "camera image stays blank" issue
+- Camera app: fix one-in-two 'camera image stays blank' issue
 - OSUpdate app: enable scrolling with joystick/arrow keys
 - OSUpdate app: Major rework with improved reliability and user experience
-    - add WiFi monitoring - shows "Waiting for WiFi..." instead of error when no connection
+    - add WiFi monitoring - shows 'Waiting for WiFi...' instead of error when no connection
     - add automatic pause/resume on WiFi loss during downloads using HTTP Range headers
     - add user-friendly error messages with specific guidance for each error type
-    - add "Check Again" button for easy retry after errors
+    - add 'Check Again' button for easy retry after errors
     - add state machine for better app state management
     - add comprehensive test coverage (42 tests: 31 unit tests + 11 graphical tests)
     - refactor code into testable components (NetworkMonitor, UpdateChecker, UpdateDownloader)
@@ -17,7 +17,7 @@
     - improve timeout handling (5-minute wait for WiFi with clear messaging)
 - Tests: add test infrastructure with mock classes for network, HTTP, and partition operations
 - Tests: add graphical test helper utilities for UI verification and screenshot capture
-- API: change "display" to mpos.ui.main_display
+- API: change 'display' to mpos.ui.main_display
 - API: change mpos.ui.th to mpos.ui.task_handler
 - waveshare-esp32-s3-touch-lcd-2: power off camera at boot to conserve power
 - waveshare-esp32-s3-touch-lcd-2: increase touch screen input clock frequency from 100kHz to 400kHz

tests/test_osupdate.py

@@ -1,109 +1,12 @@
 import unittest
 import sys
 
-# Mock classes for testing
-class MockNetwork:
-    """Mock network module for testing NetworkMonitor."""
+# Add parent directory to path so we can import network_test_helper
+# When running from unittest.sh, we're in internal_filesystem/, so tests/ is ../tests/
+sys.path.insert(0, '../tests')
 
-    STA_IF = 0  # Station interface constant
-
-    class MockWLAN:
-        def __init__(self, interface):
-            self.interface = interface
-            self._connected = True  # Default to connected
-
-        def isconnected(self):
-            return self._connected
-
-    def __init__(self, connected=True):
-        self._connected = connected
-
-    def WLAN(self, interface):
-        wlan = self.MockWLAN(interface)
-        wlan._connected = self._connected
-        return wlan
-
-    def set_connected(self, connected):
-        """Helper to change connection state."""
-        self._connected = connected
-
-
-class MockRaw:
-    """Mock raw response for streaming."""
-    def __init__(self, content):
-        self.content = content
-        self.position = 0
-
-    def read(self, size):
-        chunk = self.content[self.position:self.position + size]
-        self.position += len(chunk)
-        return chunk
-
-
-class MockResponse:
-    """Mock HTTP response."""
-    def __init__(self, status_code=200, text='', headers=None, content=b''):
-        self.status_code = status_code
-        self.text = text
-        self.headers = headers or {}
-        self.content = content
-        self._closed = False
-
-        # Mock raw attribute for streaming
-        self.raw = MockRaw(content)
-
-    def close(self):
-        self._closed = True
-
-
-class MockRequests:
-    """Mock requests module for testing UpdateChecker and UpdateDownloader."""
-
-    def __init__(self):
-        self.last_url = None
-        self.next_response = None
-        self.raise_exception = None
-
-    def get(self, url, stream=False, timeout=None, headers=None):
-        self.last_url = url
-
-        if self.raise_exception:
-            raise self.raise_exception
-
-        if self.next_response:
-            return self.next_response
-
-        # Default response
-        return MockResponse()
-
-    def set_next_response(self, status_code=200, text='', headers=None, content=b''):
-        """Helper to set what the next get() should return."""
-        self.next_response = MockResponse(status_code, text, headers, content)
-        return self.next_response
-
-    def set_exception(self, exception):
-        """Helper to make next get() raise an exception."""
-        self.raise_exception = exception
-
-
-class MockJSON:
-    """Mock JSON module for testing UpdateChecker."""
-
-    def __init__(self):
-        self.raise_exception = None
-
-    def loads(self, text):
-        if self.raise_exception:
-            raise self.raise_exception
-
-        # Very simple JSON parser for testing
-        # In real tests, we can just use Python's json module
-        import json
-        return json.loads(text)
-
-    def set_exception(self, exception):
-        """Helper to make loads() raise an exception."""
-        self.raise_exception = exception
+# Import network test helpers
+from network_test_helper import MockNetwork, MockRequests, MockJSON
 
 
 class MockPartition: