Rework roll pattern to use gradient palette and add preset-based tests

Made-with: Cursor

pico/test/test_all_on_presets.py

@@ -0,0 +1,71 @@
+"""
+On-device test that turns all LEDs on via Presets and verifies strip 0 (pin 6).
+
+Usage (from pico/ dir or project root with adjusted paths):
+
+    mpremote connect <device> cp src/*.py :
+    mpremote connect <device> cp src/patterns/*.py :patterns
+    mpremote connect <device> cp lib/*.py :
+    mpremote connect <device> cp test/test_all_on_presets.py :
+    mpremote connect <device> run test_all_on_presets.py
+"""
+
+from presets import Presets, Preset
+
+
+def verify_strip0_on(presets, expected_color):
+    """Check that every LED on strip 0 matches expected_color."""
+    if not presets.strips:
+        print("No strips; skipping strip-0 on test.")
+        return
+
+    strip = presets.strips[0]
+    r_exp, g_exp, b_exp = expected_color
+
+    for i in range(strip.num_leds):
+        o = i * 3
+        g = strip.ar[o]
+        r = strip.ar[o + 1]
+        b = strip.ar[o + 2]
+        if (r, g, b) != (r_exp, g_exp, b_exp):
+            raise AssertionError(
+                "Strip 0 LED %d: got (%d,%d,%d), expected (%d,%d,%d)"
+                % (i, r, g, b, r_exp, g_exp, b_exp)
+            )
+
+
+def main():
+    presets = Presets()
+
+    if not presets.strips:
+        print("No strips; skipping all-on-presets test.")
+        return
+
+    # Full-brightness white via the built-in 'on' pattern.
+    base_color = (255, 255, 255)
+    brightness = 255
+
+    data = {
+        "p": "on",
+        "c": [base_color],
+        "b": brightness,
+    }
+
+    name = "test_all_on_presets"
+    preset = Preset(data)
+    presets.presets[name] = preset
+
+    presets.select(name)
+    presets.tick()
+
+    # Compute the color actually written by the pattern after brightness scaling.
+    expected_color = presets.apply_brightness(base_color, brightness)
+
+    verify_strip0_on(presets, expected_color)
+
+    print("test_all_on_presets: OK")
+
+
+if __name__ == "__main__":
+    main()
+