tests/emulator, .github/workflows/emulator: add

tests/emulator/common.py

@@ -0,0 +1,36 @@
+import os
+import sys
+import time
+
+SERVER = 'https://nix-on-droid.unboiled.info'
+# Just use F-Droid through fdroidctl later when F-Droid has x86_64 builds
+APK = f'{SERVER}/com.termux.nix_188035-x86_64.apk'
+BOOTSTRAP_URL = 'file:///data/local/tmp/n-o-d'
+
+
+def screenshot(d, suffix=''):
+    os.makedirs('screenshots', exist_ok=True)
+    fname_base = f'screenshots/{time.time()}-{suffix}'
+    d.ui.screenshot(f'{fname_base}.png')
+    with open(f'{fname_base}.xml', 'w') as f:
+        f.write(d.ui.dump_hierarchy())
+    print(f'screenshotted: {fname_base}.{{png,xml}}')
+
+
+def wait_for(d, on_screen_text, timeout=90, critical=True):
+    start = time.time()
+    last_displayed_time = None
+    while (elapsed := time.time() - start) < timeout:
+        display_time = int(timeout - elapsed)
+        if display_time != last_displayed_time:
+            print(f'waiting for `{on_screen_text}`: {display_time}s...')
+            sys.stdout.flush()
+            last_displayed_time = display_time
+        if on_screen_text in d.ui.dump_hierarchy():
+            print(f'found: {on_screen_text} after {elapsed:.1f}s')
+            return
+        time.sleep(.75)
+    print(f'NOT FOUND: {on_screen_text} after {timeout}s')
+    screenshot(d, suffix='error')
+    if critical:
+        sys.exit(1)