Vendor dependencies for 0.3.0 release

vendor/tracing-core/tests/dispatch.rs

@@ -0,0 +1,56 @@
+#![cfg(feature = "std")]
+mod common;
+
+use common::*;
+use tracing_core::dispatcher::*;
+
+#[test]
+fn set_default_dispatch() {
+    set_global_default(Dispatch::new(TestSubscriberA)).expect("global dispatch set failed");
+    get_default(|current| {
+        assert!(
+            current.is::<TestSubscriberA>(),
+            "global dispatch get failed"
+        )
+    });
+
+    let guard = set_default(&Dispatch::new(TestSubscriberB));
+    get_default(|current| assert!(current.is::<TestSubscriberB>(), "set_default get failed"));
+
+    // Drop the guard, setting the dispatch back to the global dispatch
+    drop(guard);
+
+    get_default(|current| {
+        assert!(
+            current.is::<TestSubscriberA>(),
+            "global dispatch get failed"
+        )
+    });
+}
+
+#[test]
+fn nested_set_default() {
+    let _guard = set_default(&Dispatch::new(TestSubscriberA));
+    get_default(|current| {
+        assert!(
+            current.is::<TestSubscriberA>(),
+            "set_default for outer subscriber failed"
+        )
+    });
+
+    let inner_guard = set_default(&Dispatch::new(TestSubscriberB));
+    get_default(|current| {
+        assert!(
+            current.is::<TestSubscriberB>(),
+            "set_default inner subscriber failed"
+        )
+    });
+
+    drop(inner_guard);
+    get_default(|current| {
+        assert!(
+            current.is::<TestSubscriberA>(),
+            "set_default outer subscriber failed"
+        )
+    });
+}