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diff --git a/desktop/companion/test_lines.js b/desktop/companion/test_lines.js
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+++ b/desktop/companion/test_lines.js
@@ -0,0 +1,79 @@
+// 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_lines.js
+// Lines.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 + "/Lines.js", "utf8")
+    .replace(/^\.pragma library$/m, "");
+const L = new Function(src +
+    "\nreturn { lines, apps, artists, monologue, appMap, appList, pickApp, pickArtist, pick, toMap };")();
+
+// The defaults are what she says until a set is saved.
+assert.strictEqual(L.pickApp("firefox", null, 0), L.apps.firefox[0]);
+assert.strictEqual(L.pickApp("firefox", null, 0.99), L.apps.firefox[L.apps.firefox.length - 1]);
+assert.strictEqual(L.pickApp("nope", null, 0), "");
+assert.strictEqual(L.appMap(null), L.apps);
+// A hand edit with a typo reads as the defaults, not as silence.
+assert.strictEqual(L.appMap("typo"), L.apps);
+assert.strictEqual(L.appMap(["not", "a", "map"]), L.apps);
+
+// A saved set replaces the defaults, class by class.
+assert.strictEqual(L.pickApp("firefox", { firefox: ["hi"] }, 0), "hi");
+assert.strictEqual(L.pickApp("kitty", { firefox: ["hi"] }, 0), "");
+assert.strictEqual(L.pick("app:firefox", 0, { firefox: ["custom"] }), "custom");
+assert.strictEqual(L.pick("app:firefox", 0), L.apps.firefox[0]);
+
+// Empty phrases are skipped when picking; a class with only empty ones says
+// nothing.
+assert.strictEqual(L.pickApp("firefox", { firefox: ["", "  ", "only"] }, 0), "only");
+assert.strictEqual(L.pickApp("firefox", { firefox: ["", "  "] }, 0), "");
+
+// Reactions still come from lines.
+assert.strictEqual(L.pick("shown", 0), L.lines.shown[0]);
+assert.strictEqual(L.pick("nope", 0), "");
+
+// The saved set as an ordered list, for the settings page.
+const list = L.appList(null);
+assert.strictEqual(list.length, Object.keys(L.apps).length);
+assert.deepStrictEqual(list[0], { cls: "firefox", lines: L.apps.firefox.slice() });
+assert.deepStrictEqual(L.appList({ kitty: ["a"] }), [{ cls: "kitty", lines: ["a"] }]);
+
+// Back to a map: trim, lowercase the class, drop empty classes and empty
+// phrases, and a repeated class keeps its last entry.
+assert.deepStrictEqual(L.toMap([
+    { cls: "  Firefox ", lines: [" one ", "", "  ", "two"] },
+    { cls: "", lines: ["dropped"] },
+    { cls: "kitty", lines: ["", " "] },
+    { cls: "firefox", lines: ["last"] },
+]), { firefox: ["last"] });
+
+// Artists: a case-insensitive substring of what MPRIS reports, first
+// matching key wins, empty phrases skipped.
+assert.strictEqual(L.pickArtist("Linkin Park", null, 0), L.artists["linkin park"][0]);
+assert.strictEqual(L.pickArtist("LINKIN PARK, Jay-Z", null, 0), L.artists["linkin park"][0]);
+assert.strictEqual(L.pickArtist("Nobody", null, 0), "");
+assert.strictEqual(L.pickArtist("", null, 0), "");
+assert.strictEqual(L.pickArtist("Air, Beck", { air: ["a"], beck: ["b"] }, 0), "a");
+assert.strictEqual(L.pickArtist("Airbourne", { air: ["", "a"] }, 0), "a");
+assert.strictEqual(L.pick("artist:Eminem", 0, null, null), L.artists.eminem[0]);
+assert.strictEqual(L.pick("artist:Eminem", 0, null, { eminem: ["mine"] }), "mine");
+assert.strictEqual(L.pick("groove", 0), L.lines.groove[0]);
+
+// The same list helpers serve the artist set.
+assert.strictEqual(L.appMap(null, L.artists), L.artists);
+assert.strictEqual(L.appList(null, L.artists).length, Object.keys(L.artists).length);
+assert.deepStrictEqual(L.toMap(L.appList(null, L.artists)), L.artists);
+console.log("ok");