increase test coverage

extend test coverage

tests/e2e/unit/svgcore-clear.spec.js

@@ -0,0 +1,61 @@
+import { test, expect } from '../fixtures.js'
+
+test.describe('clear module', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/tests/unit-harness.html')
+    await page.waitForFunction(() => Boolean(window.svgHarness))
+  })
+
+  test('clears canvas content and sets default attributes', async ({ page }) => {
+    const result = await page.evaluate(() => {
+      const { clearModule } = window.svgHarness
+      const svgContent = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      svgContent.append(document.createElementNS('http://www.w3.org/2000/svg', 'rect'))
+      const svgRoot = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      const canvas = {
+        getCurConfig: () => ({ dimensions: [100, 50], show_outside_canvas: false }),
+        getSvgContent: () => svgContent,
+        getSvgRoot: () => svgRoot,
+        getDOMDocument: () => document
+      }
+
+      clearModule.init(canvas)
+      clearModule.clearSvgContentElementInit()
+      const comment = svgContent.firstChild
+
+      return {
+        childCount: svgContent.childNodes.length,
+        isComment: comment.nodeType,
+        overflow: svgContent.getAttribute('overflow'),
+        width: svgContent.getAttribute('width'),
+        height: svgContent.getAttribute('height'),
+        appended: svgRoot.contains(svgContent)
+      }
+    })
+
+    expect(result.childCount).toBe(1)
+    expect(result.isComment).toBe(8)
+    expect(result.overflow).toBe('hidden')
+    expect(result.width).toBe('100')
+    expect(result.height).toBe('50')
+    expect(result.appended).toBe(true)
+  })
+
+  test('honors show_outside_canvas flag when clearing', async ({ page }) => {
+    const overflow = await page.evaluate(() => {
+      const { clearModule } = window.svgHarness
+      const svgContent = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      const svgRoot = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      clearModule.init({
+        getCurConfig: () => ({ dimensions: [10, 20], show_outside_canvas: true }),
+        getSvgContent: () => svgContent,
+        getSvgRoot: () => svgRoot,
+        getDOMDocument: () => document
+      })
+      clearModule.clearSvgContentElementInit()
+      return svgContent.getAttribute('overflow')
+    })
+
+    expect(overflow).toBe('visible')
+  })
+})