Add line break tests for hard breaks.

Author: Iikeli

Tests/MarkdownTests/Inline Nodes/LineBreakTests.swift

@@ -25,4 +25,39 @@ final class LineBreakTests: XCTestCase {
         let paragraph = document.child(at: 0) as! Paragraph
         XCTAssertTrue(Array(paragraph.children)[1] is LineBreak)
     }
+
+    /// Test that hard line breaks work with spaces (two or more).
+    func testSpaceHardLineBreak() {
+        let source = """
+                     Paragraph.\("  ")
+                     Still the same paragraph.
+                     """
+        let document = Document(parsing: source)
+        let paragraph = document.child(at: 0) as! Paragraph
+        XCTAssertTrue(Array(paragraph.children)[1] is LineBreak)
+    }
+
+    /// Test that hard line breaks work with a slash.
+    func testSlashHardLineBreak() {
+        let source = """
+                     Paragraph.\\
+                     Still the same paragraph.
+                     """
+        let document = Document(parsing: source)
+        let paragraph = document.child(at: 0) as! Paragraph
+        XCTAssertTrue(Array(paragraph.children)[1] is LineBreak)
+    }
+
+    /// Sanity test that a multiline text without hard breaks doesn't return line breaks.
+    func testLineBreakWithout() {
+        let source = """
+                     Paragraph.
+                     Same line text.
+                     """
+        let document = Document(parsing: source)
+        
+        let paragraph = document.child(at: 0) as! Paragraph
+        XCTAssertFalse(Array(paragraph.children)[1] is LineBreak)
+        XCTAssertEqual(Array(paragraph.children)[1].withoutSoftBreaks?.childCount, nil)
+    }
 }