1 files changed, 160 insertions, 0 deletions
diff --git a/third_party/rust/tracing-attributes/tests/fields.rs b/third_party/rust/tracing-attributes/tests/fields.rs
new file mode 100644
index 0000000000..c178fbb3d3
--- /dev/null
+++ b/third_party/rust/tracing-attributes/tests/fields.rs
@@ -0,0 +1,160 @@
+use tracing::subscriber::with_default;
+use tracing_attributes::instrument;
+use tracing_mock::field::mock;
+use tracing_mock::span::NewSpan;
+use tracing_mock::*;
+
+#[instrument(fields(foo = "bar", dsa = true, num = 1))]
+fn fn_no_param() {}
+
+#[instrument(fields(foo = "bar"))]
+fn fn_param(param: u32) {}
+
+#[instrument(fields(foo = "bar", empty))]
+fn fn_empty_field() {}
+
+#[instrument(fields(len = s.len()))]
+fn fn_expr_field(s: &str) {}
+
+#[instrument(fields(s.len = s.len(), s.is_empty = s.is_empty()))]
+fn fn_two_expr_fields(s: &str) {
+    let _ = s;
+}
+
+#[instrument(fields(%s, s.len = s.len()))]
+fn fn_clashy_expr_field(s: &str) {
+    let _ = s;
+}
+
+#[instrument(fields(s = "s"))]
+fn fn_clashy_expr_field2(s: &str) {
+    let _ = s;
+}
+
+#[instrument(fields(s = &s))]
+fn fn_string(s: String) {
+    let _ = s;
+}
+
+#[derive(Debug)]
+struct HasField {
+    my_field: &'static str,
+}
+
+impl HasField {
+    #[instrument(fields(my_field = self.my_field), skip(self))]
+    fn self_expr_field(&self) {}
+}
+
+#[test]
+fn fields() {
+    let span = span::mock().with_field(
+        mock("foo")
+            .with_value(&"bar")
+            .and(mock("dsa").with_value(&true))
+            .and(mock("num").with_value(&1))
+            .only(),
+    );
+    run_test(span, || {
+        fn_no_param();
+    });
+}
+
+#[test]
+fn expr_field() {
+    let span = span::mock().with_field(
+        mock("s")
+            .with_value(&"hello world")
+            .and(mock("len").with_value(&"hello world".len()))
+            .only(),
+    );
+    run_test(span, || {
+        fn_expr_field("hello world");
+    });
+}
+
+#[test]
+fn two_expr_fields() {
+    let span = span::mock().with_field(
+        mock("s")
+            .with_value(&"hello world")
+            .and(mock("s.len").with_value(&"hello world".len()))
+            .and(mock("s.is_empty").with_value(&false))
+            .only(),
+    );
+    run_test(span, || {
+        fn_two_expr_fields("hello world");
+    });
+}
+
+#[test]
+fn clashy_expr_field() {
+    let span = span::mock().with_field(
+        // Overriding the `s` field should record `s` as a `Display` value,
+        // rather than as a `Debug` value.
+        mock("s")
+            .with_value(&tracing::field::display("hello world"))
+            .and(mock("s.len").with_value(&"hello world".len()))
+            .only(),
+    );
+    run_test(span, || {
+        fn_clashy_expr_field("hello world");
+    });
+
+    let span = span::mock().with_field(mock("s").with_value(&"s").only());
+    run_test(span, || {
+        fn_clashy_expr_field2("hello world");
+    });
+}
+
+#[test]
+fn self_expr_field() {
+    let span = span::mock().with_field(mock("my_field").with_value(&"hello world").only());
+    run_test(span, || {
+        let has_field = HasField {
+            my_field: "hello world",
+        };
+        has_field.self_expr_field();
+    });
+}
+
+#[test]
+fn parameters_with_fields() {
+    let span = span::mock().with_field(
+        mock("foo")
+            .with_value(&"bar")
+            .and(mock("param").with_value(&1u32))
+            .only(),
+    );
+    run_test(span, || {
+        fn_param(1);
+    });
+}
+
+#[test]
+fn empty_field() {
+    let span = span::mock().with_field(mock("foo").with_value(&"bar").only());
+    run_test(span, || {
+        fn_empty_field();
+    });
+}
+
+#[test]
+fn string_field() {
+    let span = span::mock().with_field(mock("s").with_value(&"hello world").only());
+    run_test(span, || {
+        fn_string(String::from("hello world"));
+    });
+}
+
+fn run_test<F: FnOnce() -> T, T>(span: NewSpan, fun: F) {
+    let (subscriber, handle) = subscriber::mock()
+        .new_span(span)
+        .enter(span::mock())
+        .exit(span::mock())
+        .done()
+        .run_with_handle();
+
+    with_default(subscriber, fun);
+    handle.assert_finished();
+}