Add (failing) test for the newline insertion issue

This adds a test which fails because Splash inserts additional whitespace at the beginning of code if the code has empty lines before it starts.
JohnSundell · terhechte · Jun 7, 2020 · Jun 7, 2020 · Jun 7, 2020 · Aug 5, 2022
commit 52aaa1ecff7dfa26ba6ff6b065892490baf022e8
diff --git a/Tests/SplashTests/Tests/AttributedStringTests.swift b/Tests/SplashTests/Tests/AttributedStringTests.swift
@@ -0,0 +1,58 @@
+#if !os(Linux)
+
+import Foundation
+import XCTest
+import Splash
+
+final class AttributedStringOutputFormatTests: SplashTestCase {
+    private var highlighter: SyntaxHighlighter<AttributedStringOutputFormat>!
+
+    override func setUp() {
+        super.setUp()
+        highlighter = SyntaxHighlighter(format: AttributedStringOutputFormat(theme: Theme.presentation(withFont: .init(size: 15))))
+    }
+
+    func testBasicAttributedStringOutputMatchesInput() {
+        let input = """
+        public struct Test: SomeProtocol {
+            func hello() -> Int { return 7 }
+        }
+        """
+        let output = highlighter.highlight(input)
+        XCTAssertEqual(input, output.string)
+    }
+
+    func testNewlinesAttributedStringOutputMatchesInput() {
+        let input = """
+
+        typealias a = b
+        typealias b = c
+
+        print("hello")
+        """
+        let output = highlighter.highlight(input)
+        XCTAssertEqual(input, output.string)
+    }
+
+    func testInnerNewlinesAttributedStringOutputMatchesInput() {
+        let input = """
+        typealias a = b
+        typealias b = c
+
+        print("hello")
+
+        print("hello")
+        print("hello")
+
+
+        print("hello")
+        """
+        let output = highlighter.highlight(input)
+        XCTAssertEqual(input, output.string)
+    }
+
+    func testAllTestsRunOnLinux() {
+    }
+}
+
+#endif