test: Add a test for a group with no Title

Author: Muscraft

examples/elide_header.rs

@@ -0,0 +1,21 @@
+use annotate_snippets::{AnnotationKind, Group, Level, Renderer, Snippet};
+
+fn main() {
+    let source = r#"# Docstring followed by a newline
+
+def foobar(door, bar={}):
+    """
+    """
+"#;
+
+    let message = &[Group::new()
+        .element(
+            Snippet::source(source)
+                .fold(false)
+                .annotation(AnnotationKind::Primary.span(56..58).label("B006")),
+        )
+        .element(Level::HELP.title("Replace with `None`; initialize within function"))];
+
+    let renderer = Renderer::styled();
+    anstream::println!("{}", renderer.render(message));
+}

examples/elide_header.svg

@@ -14,6 +14,13 @@ fn custom_level() {
     assert_example(target, expected);
 }
 
+#[test]
+fn elide_header() {
+    let target = "elide_header";
+    let expected = snapbox::file!["../examples/elide_header.svg": TermSvg];
+    assert_example(target, expected);
+}
+
 #[test]
 fn expected_type() {
     let target = "expected_type";