3 files changed, 71 insertions, 0 deletions
diff --git a/tests/span-tests/demo.html b/tests/span-tests/demo.html
new file mode 100644
index 0000000..900f74c
--- /dev/null
+++ b/tests/span-tests/demo.html
@@ -0,0 +1 @@
+this is a tag: <h1>test</h1>
diff --git a/tests/span-tests/demo.out b/tests/span-tests/demo.out
new file mode 100644
index 0000000..98d6766
--- /dev/null
+++ b/tests/span-tests/demo.out
@@ -0,0 +1,7 @@
+note:
+  ┌─ test.html:1:17
+  │
+1 │ this is a tag: <h1>test</h1>
+  │                 ^^       ^^ end tag
+  │                 │
+  │                 start tag
diff --git a/tests/test_spans.rs b/tests/test_spans.rs
new file mode 100644
index 0000000..a3d1c96
--- /dev/null
+++ b/tests/test_spans.rs
@@ -0,0 +1,63 @@
+use std::include_str;
+
+use codespan_reporting::{
+    self,
+    diagnostic::{Diagnostic, Label},
+    files::SimpleFiles,
+    term::{self, termcolor::Buffer},
+};
+use html5gum::{
+    spans::{PosTracker, SpanEmitter},
+    Readable, Token, Tokenizer,
+};
+
+#[test]
+fn test() {
+    let html = include_str!("span-tests/demo.html");
+
+    let mut files = SimpleFiles::new();
+    let file_id = files.add("test.html", html);
+    let mut labels = Vec::new();
+
+    for token in Tokenizer::new_with_emitter(
+        PosTracker {
+            reader: html.to_reader(),
+            position: 0,
+        },
+        SpanEmitter::default(),
+    )
+    .infallible()
+    {
+        if let Token::StartTag(tag) = token {
+            labels.push(Label::primary(file_id, tag.name_span).with_message("start tag"));
+        } else if let Token::EndTag(tag) = token {
+            labels.push(Label::primary(file_id, tag.name_span).with_message("end tag"));
+        }
+    }
+
+    let diagnostic = Diagnostic::note().with_labels(labels);
+
+    let mut writer = Buffer::no_color();
+    let config = codespan_reporting::term::Config::default();
+    term::emit(&mut writer, &config, &files, &diagnostic).unwrap();
+
+    let actual = remove_trailing_spaces(std::str::from_utf8(writer.as_slice()).unwrap());
+    let expected = include_str!("span-tests/demo.out");
+
+    if actual != expected {
+        println!(
+            "EXPECTED:\n{banner}\n{expected}{banner}\n\nACTUAL OUTPUT:\n{banner}\n{actual}{banner}",
+            banner = "-".repeat(30),
+            expected = expected,
+            actual = actual
+        );
+        panic!("failed");
+    }
+}
+
+fn remove_trailing_spaces(text: &str) -> String {
+    text.lines()
+        .map(|l| l.trim_end())
+        .collect::<Vec<_>>()
+        .join("\n")
+}