skip snapshot sessions tests on sharded 7.0+

Author: isabelatkinson

src/test/spec/sessions.rs

@@ -30,9 +30,17 @@ use crate::{
 #[cfg_attr(feature = "async-std-runtime", async_std::test)]
 async fn run_unified() {
     let _guard: RwLockWriteGuard<()> = LOCK.run_exclusively().await;
+
+    // TODO RUST-1414: unskip this file
+    let mut skipped_files = vec!["implicit-sessions-default-causal-consistency.json"];
+    let client = TestClient::new().await;
+    if client.is_sharded() && client.server_version_gte(7, 0) {
+        // TODO RUST-1666: unskip this file
+        skipped_files.push("snapshot-sessions.json");
+    }
+
     run_unified_tests(&["sessions"])
-        // TODO RUST-1414: unskip this file
-        .skip_files(vec!["implicit-sessions-default-causal-consistency.json"])
+        .skip_files(skipped_files)
         .await;
 }