Getting there

src/config/vibe-presets.test.ts

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+import { describe, expect, it } from 'vitest';
+
+import { vibePresets } from './vibe-presets';
+
+const FINAL_VIBE_NAMES = [
+  'Aurora Mycelium',
+  'Velvet Observatory',
+  'Lichen Signal',
+  'Tidepool Lantern',
+  'Paper Lantern Fog Copy',
+  'Chrome Pollen',
+];
+
+describe('vibePresets', () => {
+  it('keeps the classic preset set distinct', () => {
+    expect(vibePresets.map((preset) => preset.name)).toEqual(FINAL_VIBE_NAMES);
+
+    const ids = vibePresets.map((preset) => preset.id);
+    expect(new Set(ids).size).toBe(vibePresets.length);
+  });
+
+  it('includes both blended and visibly particulate styles', () => {
+    const blendedNames = vibePresets
+      .filter(
+        (preset) => preset.settings.brushSize >= 17 && preset.settings.clarity <= 0.56
+      )
+      .map((preset) => preset.name);
+    const softParticleNames = vibePresets
+      .filter(
+        (preset) => preset.settings.brushSize <= 5 && preset.settings.clarity <= 0.2
+      )
+      .map((preset) => preset.name);
+
+    expect(blendedNames).toEqual([
+      'Aurora Mycelium',
+      'Tidepool Lantern',
+    ]);
+    expect(softParticleNames).toEqual(['Chrome Pollen']);
+  });
+
+  it('stays inside interactive performance guardrails', () => {
+    const violations = vibePresets.flatMap((preset) => {
+      const { name, settings } = preset;
+      const presetViolations: Array<string> = [];
+
+      if (settings.spawnPerPixel > 0.38) {
+        presetViolations.push(`${name} density exceeds 0.38`);
+      }
+      if (settings.brushSize > 36) {
+        presetViolations.push(`${name} brush size exceeds 36`);
+      }
+      if (
+        settings.spawnPerPixel >= 0.28 &&
+        (settings.decayRateTrails > 940 ||
+          settings.brushSize > 14 ||
+          settings.individualTrailWeight > 0.055)
+      ) {
+        presetViolations.push(`${name} combines high density with too much persistence`);
+      }
+
+      return presetViolations;
+    });
+
+    expect(violations).toEqual([]);
+  });
+});