Implemented phase 0 for the POC prototype in the Website service.

Services/Website/Tests/Library/Cases/Internal/Components/IconTests.swift

@@ -0,0 +1,30 @@
+import Elementary
+import Testing
+
+@testable import WebsiteLibrary
+
+@Suite(
+    "Icon component",
+    .tags(.component)
+)
+struct IconTests {
+
+    // MARK: Functional tests
+
+    @Test
+    func `renders a decorative icon at the given size`() {
+        let html = Icon(.search, size: 16).render()
+
+        #expect(html.hasPrefix("<svg"))
+        #expect(html.contains(#"width="16" height="16""#))
+        #expect(html.contains(#"aria-hidden="true""#))
+        #expect(html.contains(#"stroke="currentColor""#))
+    }
+
+    @Test
+    func `renders no inline styles`() {
+        // The Content-Security-Policy blocks `style` attributes, inside an SVG as anywhere else.
+        #expect(!Icon(.key).render().contains("style="))
+    }
+
+}