Copy a garden (deep duplicate) from the gardens list (#46)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

web/src/lib/gardens.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from 'vitest'
+import { defaultCopyName } from './gardens'
+
+// The server caps a garden name at 200 BYTES and derives a copy's name the same
+// way (copyName in internal/service/gardens.go). These cases pin the mirror: an
+// over-long prefill would come back as a 400 rather than a copy.
+describe('defaultCopyName', () => {
+  it('appends the suffix to a short name', () => {
+    expect(defaultCopyName('Home')).toBe('Home (copy)')
+  })
+
+  it('keeps a derived name within the 200-byte cap', () => {
+    const name = 'a'.repeat(200)
+    const derived = defaultCopyName(name)
+    expect(new TextEncoder().encode(derived).length).toBeLessThanOrEqual(200)
+    expect(derived.endsWith(' (copy)')).toBe(true)
+  })
+
+  it('truncates multi-byte names on a code-point boundary', () => {
+    const name = 'é'.repeat(100) // 200 bytes, exactly at the cap
+    const derived = defaultCopyName(name)
+    expect(new TextEncoder().encode(derived).length).toBeLessThanOrEqual(200)
+    // No replacement character: nothing was cut mid-code-point.
+    expect(derived).not.toContain('�')
+  })
+
+  it('does not leave a dangling space before the suffix', () => {
+    const name = 'x'.repeat(192) + ' y' // truncation lands on the space
+    expect(defaultCopyName(name)).toBe('x'.repeat(192) + ' (copy)')
+  })
+})