markup parse and tests

tests/test_markup.py

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+import pytest
+
+from textual.content import Content, Span
+from textual.markup import to_content
+
+
+@pytest.mark.parametrize(
+    ["markup", "content"],
+    [
+        ("", Content("")),
+        ("foo", Content("foo")),
+        ("foo\n", Content("foo\n")),
+        ("foo\nbar", Content("foo\nbar")),
+        ("[bold]Hello", Content("Hello", [Span(0, 5, "bold")])),
+        (
+            "[bold rgb(10, 20, 30)]Hello",
+            Content("Hello", [Span(0, 5, "bold rgb(10, 20, 30)")]),
+        ),
+        (
+            "[bold red]Hello[/] World",
+            Content("Hello World", [Span(0, 5, "bold red")]),
+        ),
+        (
+            "[bold red]Hello",
+            Content("Hello", [Span(0, 5, "bold red")]),
+        ),
+        (
+            "[bold red]Hello[/]\nWorld",
+            Content("Hello\nWorld", [Span(0, 5, "bold red")]),
+        ),
+        (
+            "[b][on red]What [i]is up[/on red] with you?[/]",
+            Content("What is up with you?"),
+        ),
+        (
+            "[b]Welcome to Textual[/b]\n\nI must not fear",
+            Content("Welcome to Textual\n\nI must not fear"),
+        ),
+    ],
+)
+def test_to_content(markup: str, content: Content):
+    markup_content = to_content(markup)
+    print(repr(markup_content))
+    print(repr(content))
+    assert markup_content.is_same(content)