add sharded spec test

Author: W-A-James

test/spec/server-discovery-and-monitoring/unified/sharded-emit-topology-changed-before-close.json

@@ -0,0 +1,97 @@
+{
+  "description": "sharded-emit-topology-description-changed-before-close",
+  "schemaVersion": "1.16",
+  "runOnRequirements": [
+    {
+      "topologies": [
+        "sharded"
+      ],
+      "minServerVersion": "4.4"
+    }
+  ],
+  "tests": [
+    {
+      "description": "Topology lifecycle",
+      "operations": [
+        {
+          "name": "createEntities",
+          "object": "testRunner",
+          "arguments": {
+            "entities": [
+              {
+                "client": {
+                  "id": "client",
+                  "observeEvents": [
+                    "topologyDescriptionChangedEvent",
+                    "topologyOpeningEvent",
+                    "topologyClosedEvent"
+                  ]
+                }
+              }
+            ]
+          }
+        },
+        {
+          "name": "waitForEvent",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client",
+            "event": {
+              "topologyDescriptionChangedEvent": {}
+            },
+            "count": 2
+          }
+        },
+        {
+          "name": "close",
+          "object": "client"
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client",
+          "eventType": "sdam",
+          "ignoreExtraEvents": true,
+          "events": [
+            {
+              "topologyOpeningEvent": {}
+            },
+            {
+              "topologyDescriptionChangedEvent": {
+                "previousDescription": {
+                  "type": "Unknown"
+                },
+                "newDescription": {
+                  "type": "Unknown"
+                }
+              }
+            },
+            {
+              "topologyDescriptionChangedEvent": {
+                "previousDescription": {
+                  "type": "Unknown"
+                },
+                "newDescription": {
+                  "type": "Sharded"
+                }
+              }
+            },
+            {
+              "topologyDescriptionChangedEvent": {
+                "previousDescription": {
+                  "type": "Sharded"
+                },
+                "newDescription": {
+                  "type": "Unknown"
+                }
+              }
+            },
+            {
+              "topologyClosedEvent": {}
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

test/spec/server-discovery-and-monitoring/unified/sharded-emit-topology-changed-before-close.yml

@@ -0,0 +1,55 @@
+description: "sharded-emit-topology-description-changed-before-close"
+
+schemaVersion: "1.16"
+
+runOnRequirements:
+  - topologies:
+      - sharded
+    minServerVersion: "4.4" # awaitable hello
+
+tests:
+  - description: "Topology lifecycle"
+    operations:
+      - name: createEntities
+        object: testRunner
+        arguments:
+          entities:
+            - client:
+                id: &client client
+                observeEvents:
+                  - topologyDescriptionChangedEvent
+                  - topologyOpeningEvent
+                  - topologyClosedEvent
+      # ensure the topology has been fully discovered before closing the client.
+      # expected events are initial server discovery and server connect event.
+      - name: waitForEvent
+        object: testRunner
+        arguments:
+          client: *client
+          event:
+            topologyDescriptionChangedEvent: {}
+          count: 2
+      - name: close
+        object: *client
+    expectEvents:
+      - client: *client
+        eventType: sdam
+        ignoreExtraEvents: true
+        events:
+          - topologyOpeningEvent: {}
+          - topologyDescriptionChangedEvent: # unknown -> unknown w disconnected server
+              previousDescription: 
+                type: "Unknown"
+              newDescription:
+                type: "Unknown"
+          - topologyDescriptionChangedEvent:  # server connected
+              previousDescription:
+                type: "Unknown"
+              newDescription:
+                type: "Sharded"
+          - topologyDescriptionChangedEvent:  # sharded -> unknown
+              previousDescription:
+                type: "Sharded"
+              newDescription:
+                type: "Unknown"
+          - topologyClosedEvent: {}