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diff --git a/spike/settings/source/DebugSelfTest.mc b/spike/settings/source/DebugSelfTest.mc
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+// Author:  cirakg & claude ai
+// Summary: Debug-only self-test: fills one field and runs the settings-change path once, so the simulator shows real output.
+//
+// The simulator has no phone, so this stands in for one save from Garmin
+// Connect: if Text 1 is empty it receives a fake 100-character test string,
+// then the normal onSettingsChanged path runs (analysis plus write-back).
+// It prints a "SPIKE ready" line that build-spike.sh waits for. Release
+// builds compile the empty (:release) version, so the beta you upload never
+// changes your settings by itself.
+
+import Toybox.Application.Properties;
+import Toybox.Lang;
+import Toybox.System;
+
+module DebugSelfTest {
+
+    // Fake 100-character test string in the same format as the phone tests.
+    (:debug)
+    const SAMPLE = "N=100|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghEND";
+
+    (:debug)
+    function run(app as SpikeApp) as Void {
+        var current = Properties.getValue("text1");
+        if (current == null || (current instanceof String && current.length() == 0)) {
+            Properties.setValue("text1", SAMPLE);
+            app.onSettingsChanged();
+        }
+        System.println("SPIKE ready total_chars=" + app.report.totalChars + " changes=" + app.report.changeCount
+            + " status='" + Properties.getValue("statusField") + "'");
+    }
+
+    (:release)
+    function run(app as SpikeApp) as Void {
+    }
+}