Serverpuls: deutsche Zeitachse und Legende im Diagramm

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/serverpulsFormat.test.mjs

@@ -2,7 +2,7 @@ import test from 'node:test'
 import assert from 'node:assert/strict'
 import { loadModule } from './load.mjs'
 
-const { formatBytes, formatDelta, ageLabel, usedPct } = await loadModule('src/lib/serverpulsFormat.js')
+const { formatBytes, formatDelta, ageLabel, usedPct, axisTimeKind, formatAxisTick, formatLegendTime } = await loadModule('src/lib/serverpulsFormat.js')
 
 test('formatBytes: de-DE, Basis 1024', () => {
   assert.equal(formatBytes(1288490189), '1,2 GB')
@@ -34,3 +34,21 @@ test('usedPct: RAM value ist frei', () => {
   assert.equal(usedPct(250, 1000), 75)
   assert.equal(usedPct(null, 1000), null)
 })
+
+test('Zeitachse: Format nach Tick-Abstand', () => {
+  assert.equal(axisTimeKind(3600), 'time')
+  assert.equal(axisTimeKind(86400), 'day')
+  assert.equal(axisTimeKind(86400 * 30), 'month')
+  assert.equal(axisTimeKind(86400 * 365), 'year')
+})
+
+test('Zeitachse: deutsche Ausgabe in Europe/Berlin', () => {
+  const t = Date.UTC(2026, 8, 30, 9, 20) / 1000 // 11:20 Berlin (MESZ)
+  assert.equal(formatAxisTick(t, 3600), '11:20')
+  assert.equal(formatAxisTick(t, 86400 * 2), '30.09.')
+  assert.equal(formatAxisTick(Date.UTC(2026, 8, 29, 22, 0) / 1000, 3600 * 6), '30.09.') // Mitternacht Berlin
+  assert.match(formatAxisTick(t, 86400 * 30), /2026/)
+  assert.equal(formatAxisTick(t, 86400 * 365), '2026')
+  assert.equal(formatLegendTime(t), '30.09.2026, 11:20')
+  assert.equal(formatLegendTime(null), '–')
+})