Translate social and marketplace parity tests

tests/compat/tests/social_constructor_semantics.rs

@@ -0,0 +1,20 @@
+// Exact Rust translations of the remaining manager cases in
+// LibreMetaverse.Tests/ConstructorNullArgumentTests.cs.
+// Source SHA-256: 28deea0bf4d9353a2424842c6184abab8fe82746ceb12e093912728a247f21bc
+
+use libremetaverse::{AppearanceManager, AvatarManager, Error};
+
+// parity-case: LibreMetaverse.Tests/ConstructorNullArgumentTests.cs::ConstructorNullArgumentTests.AppearanceManager_Null_Throws::test a3c872805bc924b5a1a9441d5c9eb61ed6d6e9477e4bb411131359290b144ab4 translated
+#[test]
+fn appearance_manager_null_throws() {
+    assert!(matches!(
+        AppearanceManager::new(None),
+        Err(Error::ArgumentNull)
+    ));
+}
+
+// parity-case: LibreMetaverse.Tests/ConstructorNullArgumentTests.cs::ConstructorNullArgumentTests.AvatarManager_Null_Throws::test 54f23cbf0ba87b0525c2914e78d75808e93fd1c460fc0bec4d15f09575b1431c translated
+#[test]
+fn avatar_manager_null_throws() {
+    assert!(matches!(AvatarManager::new(None), Err(Error::ArgumentNull)));
+}