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tests/unit/rendering.py

@@ -2,7 +2,12 @@
 
 from html.parser import HTMLParser
 
-from devplacepy.rendering import render_content, render_title
+from devplacepy.rendering import (
+    markdown_structure_signature,
+    render_content,
+    render_title,
+    safe_truncate,
+)
 
 
 def test_emoji_shortcodes():
@@ -12,6 +17,37 @@ def test_emoji_shortcodes():
     assert ":rocket:" not in out
 
 
+def test_markdown_structure_signature_counts_elements():
+    text = (
+        "# Title\n\n"
+        "- one\n- two\n\n"
+        "1. first\n2. second\n\n"
+        "```python\nprint(1)\n```\n\n"
+        "[link](https://example.com)\n"
+    )
+    assert markdown_structure_signature(text) == {
+        "code_fences": 1,
+        "list_items": 4,
+        "headers": 1,
+        "links": 1,
+    }
+
+
+def test_markdown_structure_signature_blank_text():
+    assert markdown_structure_signature("") == {
+        "code_fences": 0,
+        "list_items": 0,
+        "headers": 0,
+        "links": 0,
+    }
+
+
+def test_markdown_structure_signature_ignores_word_changes():
+    original = markdown_structure_signature("- alpha\n- beta\n- gamma\n")
+    reworded = markdown_structure_signature("- Alpha\n- beta\n- gamma\n")
+    assert original == reworded
+
+
 def test_markdown_bold_and_italic():
     out = str(render_content("this is **bold** and _em_"))
     assert "<strong>bold</strong>" in out
@@ -47,6 +83,38 @@ def test_plain_url_autolinked():
     assert '<a href="https://example.com/page" target="_blank" rel="noopener noreferrer">' in out
 
 
+def test_safe_truncate_short_text_unchanged():
+    text = "short content"
+    assert safe_truncate(text, 300) == text
+
+
+def test_safe_truncate_backs_off_to_word_boundary():
+    text = "a" * 45 + " " + "b" * 45
+    truncated = safe_truncate(text, 50)
+    assert truncated == "a" * 45
+
+
+def test_safe_truncate_does_not_split_a_url_straddling_the_cutoff():
+    prefix = "word " * 58
+    url = "https://example.com/gallery/a-very-long-descriptive-photo-name.jpg"
+    text = prefix + url + " more words after the link that get cut off entirely"
+    truncated = safe_truncate(text, 300)
+    assert url not in truncated
+    assert "example.com" not in truncated
+    out = str(render_content(truncated + "..."))
+    assert "<img" not in out
+    assert "<a href=" not in out
+
+
+def test_safe_truncate_keeps_a_url_that_fits_before_the_cutoff():
+    url = "https://example.com/image.png"
+    text = url + " " + ("word " * 60)
+    truncated = safe_truncate(text, 300)
+    assert url in truncated
+    out = str(render_content(truncated))
+    assert f'<img src="{url}"' in out
+
+
 def test_mention_links_to_profile():
     out = str(render_content("hello @alice_test there"))
     assert '<a href="/profile/alice_test" class="mention-link">@alice_test</a>' in out