1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber/tests/option.rs b/vendor/tracing-subscriber/tests/option.rs
new file mode 100644
index 000000000..738cc0a6c
--- /dev/null
+++ b/vendor/tracing-subscriber/tests/option.rs
@@ -0,0 +1,41 @@
+#![cfg(feature = "registry")]
+use tracing::level_filters::LevelFilter;
+use tracing::Subscriber;
+use tracing_subscriber::prelude::*;
+
+// This test is just used to compare to the tests below
+#[test]
+fn just_layer() {
+    let subscriber = tracing_subscriber::registry().with(LevelFilter::INFO);
+    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::INFO));
+}
+
+#[test]
+fn subscriber_and_option_some_layer() {
+    let subscriber = tracing_subscriber::registry()
+        .with(LevelFilter::INFO)
+        .with(Some(LevelFilter::DEBUG));
+    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::DEBUG));
+}
+
+#[test]
+fn subscriber_and_option_none_layer() {
+    // None means the other layer takes control
+    let subscriber = tracing_subscriber::registry()
+        .with(LevelFilter::ERROR)
+        .with(None::<LevelFilter>);
+    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::ERROR));
+}
+
+#[test]
+fn just_option_some_layer() {
+    // Just a None means everything is off
+    let subscriber = tracing_subscriber::registry().with(None::<LevelFilter>);
+    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::OFF));
+}
+
+#[test]
+fn just_option_none_layer() {
+    let subscriber = tracing_subscriber::registry().with(Some(LevelFilter::ERROR));
+    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::ERROR));
+}