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diff --git a/desktop/companion/test_mood.js b/desktop/companion/test_mood.js
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+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Run: node desktop/companion/test_mood.js
+// Mood.js is a QML library, so its .pragma line is stripped before node
+// evaluates it.
+
+const fs = require("fs");
+const assert = require("assert");
+
+const src = fs.readFileSync(__dirname + "/Mood.js", "utf8")
+    .replace(/^\.pragma library$/m, "");
+const M = new Function(src +
+    "\nreturn { T, click, clickFrame, pick, outfit, mockAllowed, canSpeak, monologue };")();
+
+const NOW = 10000000;
+// A snapshot with nothing going on, overridden per case.
+const calm = over => Object.assign({
+    now: NOW, destructAt: 0, dodging: false, shoved: false, recording: false, busy: false,
+    repliedAt: 0, clicks: { count: 0, at: 0 }, mockAt: 0, typingAt: 0, wakeAt: 0,
+    monologue: false, idle: 0,
+}, over);
+const state = over => M.pick(calm(over)).state;
+const frame = over => M.pick(calm(over)).frame;
+
+// Nothing going on: the rest pose.
+assert.deepStrictEqual(M.pick(calm({})), { state: "base", frame: "base" });
+
+// The priority table, top to bottom: with every trigger from a row down
+// active at once, that row wins. Merged so a higher row's values win.
+const ladder = [
+    ["destruct", { destructAt: NOW - 10 }],
+    ["scorched", { destructAt: NOW - M.T.destruct - 10 }],
+    ["dodge", { dodging: true }],
+    ["shoved", { shoved: true }],
+    ["listen", { recording: true }],
+    ["think", { busy: true }],
+    ["wave", { repliedAt: NOW - 10 }],
+    ["clicks", { clicks: { count: 2, at: NOW - 10 } }],
+    ["mock", { mockAt: NOW - 10 }],
+    ["watch", { typingAt: NOW - 10 }],
+    ["stretch", { wakeAt: NOW - 10 }],
+    ["muse", { monologue: true }],
+    ["lying", { idle: 3 }],
+];
+for (let i = 0; i < ladder.length; i++) {
+    const all = Object.assign({}, ...ladder.slice(i).map(l => l[1]).reverse());
+    assert.strictEqual(state(all), ladder[i][0], "everything from " + ladder[i][0] + " down");
+}
+
+// Shoved has a frame of its own: knocked off balance, glaring at the balloon.
+assert.deepStrictEqual(M.pick(calm({ shoved: true })), { state: "shoved", frame: "shoved" });
+
+// Idle levels and their frames.
+assert.deepStrictEqual(M.pick(calm({ idle: 1 })), { state: "bored", frame: "sleepy" });
+assert.deepStrictEqual(M.pick(calm({ idle: 2 })), { state: "yawn", frame: "yawn" });
+assert.deepStrictEqual(M.pick(calm({ idle: 3 })), { state: "lying", frame: "lying" });
+
+// Holds end on time.
+assert.strictEqual(state({ repliedAt: NOW - M.T.waveHold }), "base");
+assert.strictEqual(state({ typingAt: NOW - M.T.typingHold }), "base");
+assert.strictEqual(state({ wakeAt: NOW - M.T.wakeHold }), "base");
+assert.strictEqual(state({ clicks: { count: 3, at: NOW - M.T.clickHold } }), "base");
+assert.strictEqual(state({ destructAt: NOW - M.T.destruct - M.T.scorched }), "base");
+// The mock points first, then smirks.
+assert.strictEqual(frame({ mockAt: NOW - 10 }), "point");
+assert.strictEqual(frame({ mockAt: NOW - M.T.mockHold / 2 - 10 }), "smirk");
+assert.strictEqual(state({ mockAt: NOW - M.T.mockHold }), "base");
+
+// A click burst: within burstGap it grows, past it it starts over.
+let c = { count: 0, at: 0 };
+c = M.click(c, 1000);
+assert.deepStrictEqual(c, { count: 1, at: 1000 });
+c = M.click(c, 1000 + M.T.burstGap);
+assert.strictEqual(c.count, 2);
+c = M.click(c, c.at + M.T.burstGap + 1);
+assert.strictEqual(c.count, 1);
+c = { count: 0, at: 0 };
+for (let i = 0; i < 7; i++) c = M.click(c, 5000 + i * 300);
+assert.strictEqual(c.count, 7);
+// 1 smiles, 2-6 blush harder.
+assert.deepStrictEqual([1, 2, 3, 4, 5, 6].map(M.clickFrame),
+    ["smile", "blush1", "blush1", "blush2", "blush2", "blush3"]);
+
+// Outfit: the dress until the flash is over, then the leotard for
+// scorched + skirtless, then the dress again.
+assert.strictEqual(M.outfit(0, NOW), "dress");
+assert.strictEqual(M.outfit(NOW - 10, NOW), "dress");
+assert.strictEqual(M.outfit(NOW - M.T.destruct, NOW), "leotard");
+const bare = M.T.destruct + M.T.scorched + M.T.skirtless;
+assert.strictEqual(M.outfit(NOW - bare + 10, NOW), "leotard");
+assert.strictEqual(M.outfit(NOW - bare, NOW), "dress");
+
+// Cooldowns.
+assert.strictEqual(M.mockAllowed(0, NOW), true);
+assert.strictEqual(M.mockAllowed(NOW - M.T.mockCooldown + 1, NOW), false);
+assert.strictEqual(M.mockAllowed(NOW - M.T.mockCooldown, NOW), true);
+assert.strictEqual(M.canSpeak(0, NOW), true);
+assert.strictEqual(M.canSpeak(NOW - M.T.lineCooldown + 1, NOW), false);
+assert.strictEqual(M.canSpeak(NOW - M.T.lineCooldown, NOW), true);
+
+// The monologue: 1 in 4 on boredom, 1 in 3 on being shown, once an hour.
+assert.strictEqual(M.monologue("bored", 0, NOW, 0.24), true);
+assert.strictEqual(M.monologue("bored", 0, NOW, 0.25), false);
+assert.strictEqual(M.monologue("shown", 0, NOW, 0.33), true);
+assert.strictEqual(M.monologue("shown", 0, NOW, 0.34), false);
+assert.strictEqual(M.monologue("other", 0, NOW, 0), false);
+assert.strictEqual(M.monologue("bored", NOW - M.T.monologueCooldown + 1, NOW, 0), false);
+assert.strictEqual(M.monologue("bored", NOW - M.T.monologueCooldown, NOW, 0), true);
+
+console.log("ok");