increase test coverage

extend test coverage

tests/unit/utilities-extra2.test.js

@@ -0,0 +1,70 @@
+import { describe, it, expect, beforeEach } from 'vitest'
+
+import { init as initUnits } from '../../packages/svgcanvas/core/units.js'
+import {
+  init as initUtilities,
+  findDefs,
+  assignAttributes,
+  snapToGrid,
+  getHref,
+  setHref,
+  dropXMLInternalSubset,
+  encodeUTF8,
+  decodeUTF8
+} from '../../packages/svgcanvas/core/utilities.js'
+
+describe('utilities extra coverage', () => {
+  let svg
+
+  beforeEach(() => {
+    svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+    document.body.innerHTML = ''
+    document.body.append(svg)
+
+    // Initialize units and utilities with a minimal canvas/context stub
+    initUnits({
+      getBaseUnit: () => 'px',
+      getWidth: () => 200,
+      getHeight: () => 100,
+      getRoundDigits: () => 2
+    })
+    initUtilities({
+      getSvgRoot: () => svg,
+      getSvgContent: () => svg,
+      getDOMDocument: () => document,
+      getDOMContainer: () => svg,
+      getBaseUnit: () => 'cm',
+      getSnappingStep: () => 0.5
+    })
+  })
+
+  it('creates defs and removes namespaced attributes via assignAttributes', () => {
+    const defs = findDefs()
+    expect(defs.tagName).toBe('defs')
+    expect(svg.querySelectorAll('defs').length).toBe(1)
+
+    const rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect')
+    rect.setAttributeNS('http://www.w3.org/XML/1998/namespace', 'xml:space', 'preserve')
+    assignAttributes(rect, { width: '10', height: '5', 'xml:space': undefined }, 0, true)
+    expect(rect.getAttribute('width')).toBe('10')
+    expect(rect.getAttribute('height')).toBe('5')
+  })
+
+  it('snaps to grid with unit conversion and handles href helpers', () => {
+    const value = snapToGrid(2.3)
+    expect(value).toBe(0)
+
+    const use = document.createElementNS('http://www.w3.org/2000/svg', 'use')
+    setHref(use, '#ref')
+    expect(getHref(use)).toBe('#ref')
+  })
+
+  it('drops XML internal subsets and round trips UTF8 helpers', () => {
+    const doc = '<!DOCTYPE svg [<!ENTITY test "x">]><svg/>'
+    expect(dropXMLInternalSubset(doc)).toContain('<!DOCTYPE svg')
+
+    const mixed = 'äöü & < >'
+    const encoded = encodeUTF8(mixed)
+    expect(decodeUTF8(encoded)).toBe(mixed)
+  })
+})