Test conversions

Signed-off-by: Caleb Schoepp <caleb.schoepp@fermyon.com>

Author: calebschoepp

crates/factor-observe/src/host.rs

@@ -247,5 +247,3 @@ impl tracer::HostSpan for InstanceState {
         Ok(())
     }
 }
-
-// TODO(Caleb): Write tests somewhere for all the finicky type conversion stuff

crates/world/src/conversions.rs

@@ -360,4 +360,33 @@ mod observe {
             }
         }
     }
+
+    mod test {
+        #[test]
+        fn trace_flags() {
+            let flags = opentelemetry::trace::TraceFlags::SAMPLED;
+            let flags2 = crate::wasi::observe::tracer::TraceFlags::from(flags);
+            let flags3 = opentelemetry::trace::TraceFlags::from(flags2);
+            assert_eq!(flags, flags3);
+        }
+
+        #[test]
+        fn span_context() {
+            let sc = opentelemetry::trace::SpanContext::new(
+                opentelemetry::trace::TraceId::from_hex("4fb34cb4484029f7881399b149e41e98")
+                    .unwrap(),
+                opentelemetry::trace::SpanId::from_hex("9ffd58d3cd4dd90b").unwrap(),
+                opentelemetry::trace::TraceFlags::SAMPLED,
+                false,
+                opentelemetry::trace::TraceState::from_key_value(vec![
+                    ("foo", "bar"),
+                    ("baz", "qux"),
+                ])
+                .unwrap(),
+            );
+            let sc2 = crate::wasi::observe::tracer::SpanContext::from(sc.clone());
+            let sc3 = opentelemetry::trace::SpanContext::from(sc2);
+            assert_eq!(sc, sc3);
+        }
+    }
 }