1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/rust/document-features/tests/self-doc.rs b/third_party/rust/document-features/tests/self-doc.rs
new file mode 100644
index 0000000000..4e27113145
--- /dev/null
+++ b/third_party/rust/document-features/tests/self-doc.rs
@@ -0,0 +1,37 @@
+#[test]
+fn ensure_it_compiles() {
+    document_features::document_features!();
+    document_features::document_features!(feature_label = "**`{feature}`**");
+    document_features::document_features!(feature_label = r"**`{feature}`**");
+    document_features::document_features!(feature_label = r#"**`{feature}`**"#);
+    document_features::document_features!(
+        feature_label = "<span class=\"stab portability\"><code>{feature}</code></span>"
+    );
+    document_features::document_features!(
+        feature_label = r#"<span class="stab portability"><code>{feature}</code></span>"#
+    );
+    document_features::document_features!(
+        feature_label = r##"<span class="stab portability"><code>{feature}</code></span>"##
+    );
+}
+
+#[test]
+fn self_doc() {
+    let actual = document_features::document_features!();
+    let expected = "* **`self-test`** —  Internal feature used only for the tests, don't enable\n";
+    assert_eq!(actual, expected);
+}
+
+#[test]
+fn self_doc_with_custom_label() {
+    let actual = document_features::document_features!(
+        feature_label = r#"<span class="stab portability"><code>{feature}</code></span>"#
+    );
+    let expected =
+        "* <span class=\"stab portability\"><code>self-test</code></span> —  Internal feature used only for the tests, don't enable\n";
+    assert_eq!(actual, expected);
+    let actual2 = document_features::document_features!(
+        feature_label = "<span class=\"stab\u{0020}portability\"><code>{feature}</code></span>"
+    );
+    assert_eq!(actual2, expected);
+}