add HTMLBuilderTests

Tests/WingedSwiftTests/HTMLBuilderTests.swift

@@ -0,0 +1,60 @@
+import XCTest
+@testable import WingedSwift
+
+final class HTMLBuilderTests: XCTestCase {
+    func testHTMLBuilderCreatesRootHTMLTag() {
+        // Given
+        let expectedTagName = "html"
+
+        // When
+        let document = html {
+            HTMLTag("body")
+            HTMLTag("head")
+        }
+
+        // Then
+        XCTAssertEqual(document.name, expectedTagName, "Root tag should be 'html'")
+        XCTAssertEqual(document.children.count, 2, "Root tag should have two children.")
+        XCTAssertEqual(document.children[0].name, "body", "First child should be 'body'")
+        XCTAssertEqual(document.children[1].name, "head", "Second child should be 'head'")
+    }
+
+    func testHTMLBuilderHandlesOptional() {
+        // Given
+        let optionalComponent: HTMLTag? = HTMLTag("optional")
+
+        // When
+        let document = html {
+            HTMLBuilder.buildOptional(optionalComponent)
+        }
+
+        // Then
+        XCTAssertEqual(document.name, "html", "Root tag should be 'html'")
+        XCTAssertEqual(document.children.count, 1, "Root tag should have one child.")
+        XCTAssertEqual(document.children[0].name, "optional", "Child tag should be 'optional'")
+    }
+
+    func testHTMLBuilderHandlesEitherFirst() {
+        // When
+        let document = html {
+            HTMLBuilder.buildEither(first: HTMLTag("first"))
+        }
+
+        // Then
+        XCTAssertEqual(document.name, "html", "Root tag should be 'html'")
+        XCTAssertEqual(document.children.count, 1, "Root tag should have one child.")
+        XCTAssertEqual(document.children[0].name, "first", "Child tag should be 'first'")
+    }
+
+    func testHTMLBuilderHandlesEitherSecond() {
+        // When
+        let document = html {
+            HTMLBuilder.buildEither(second: HTMLTag("second"))
+        }
+
+        // Then
+        XCTAssertEqual(document.name, "html", "Root tag should be 'html'")
+        XCTAssertEqual(document.children.count, 1, "Root tag should have one child.")
+        XCTAssertEqual(document.children[0].name, "second", "Child tag should be 'second'")
+    }
+}