diff --git a/tests/UnifiedSpecTests/UnifiedSpecTest.php b/tests/UnifiedSpecTests/UnifiedSpecTest.php
index 9a4fea23f..60bc90ffb 100644
--- a/tests/UnifiedSpecTests/UnifiedSpecTest.php
+++ b/tests/UnifiedSpecTests/UnifiedSpecTest.php
@@ -65,6 +65,11 @@ class UnifiedSpecTest extends FunctionalTestCase
         'valid-pass/createEntities-operation: createEntities operation' => 'CSOT is not yet implemented (PHPC-1760)',
         'valid-pass/entity-cursor-iterateOnce: iterateOnce' => 'CSOT is not yet implemented (PHPC-1760)',
         'valid-pass/matches-lte-operator: special lte matching operator' => 'CSOT is not yet implemented (PHPC-1760)',
+        // BulkWriteException prevents access to server responses
+        'crud/bulkWrite-errorResponse: bulkWrite operations support errorResponse assertions' => 'TBD',
+        'crud/deleteOne-errorResponse: delete operations support errorResponse assertions' => 'TBD',
+        'crud/insertOne-errorResponse: insert operations support errorResponse assertions' => 'TBD',
+        'crud/updateOne-errorResponse: update operations support errorResponse assertions' => 'TBD',
     ];
 
     /** @var UnifiedTestRunner */
diff --git a/tests/UnifiedSpecTests/collection-management/modifyCollection-errorResponse.json b/tests/UnifiedSpecTests/collection-management/modifyCollection-errorResponse.json
new file mode 100644
index 000000000..aea71eb08
--- /dev/null
+++ b/tests/UnifiedSpecTests/collection-management/modifyCollection-errorResponse.json
@@ -0,0 +1,118 @@
+{
+  "description": "modifyCollection-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0",
+        "observeEvents": [
+          "commandStartedEvent"
+        ]
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "collMod-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "test",
+      "databaseName": "collMod-tests",
+      "documents": [
+        {
+          "_id": 1,
+          "x": 1
+        },
+        {
+          "_id": 2,
+          "x": 1
+        }
+      ]
+    }
+  ],
+  "tests": [
+    {
+      "description": "modifyCollection prepareUnique violations are accessible",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "5.2"
+        }
+      ],
+      "operations": [
+        {
+          "name": "createIndex",
+          "object": "collection0",
+          "arguments": {
+            "keys": {
+              "x": 1
+            }
+          }
+        },
+        {
+          "name": "modifyCollection",
+          "object": "database0",
+          "arguments": {
+            "collection": "test",
+            "index": {
+              "keyPattern": {
+                "x": 1
+              },
+              "prepareUnique": true
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 3,
+              "x": 1
+            }
+          },
+          "expectError": {
+            "errorCode": 11000
+          }
+        },
+        {
+          "name": "modifyCollection",
+          "object": "database0",
+          "arguments": {
+            "collection": "test",
+            "index": {
+              "keyPattern": {
+                "x": 1
+              },
+              "unique": true
+            }
+          },
+          "expectError": {
+            "isClientError": false,
+            "errorCode": 359,
+            "errorResponse": {
+              "violations": [
+                {
+                  "ids": [
+                    1,
+                    2
+                  ]
+                }
+              ]
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/aggregate-merge-errorResponse.json b/tests/UnifiedSpecTests/crud/aggregate-merge-errorResponse.json
new file mode 100644
index 000000000..bfb232480
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/aggregate-merge-errorResponse.json
@@ -0,0 +1,86 @@
+{
+  "description": "aggregate-merge-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "test",
+      "databaseName": "crud-tests",
+      "documents": [
+        {
+          "_id": 1,
+          "x": 1
+        },
+        {
+          "_id": 2,
+          "x": 1
+        }
+      ]
+    }
+  ],
+  "tests": [
+    {
+      "description": "aggregate $merge DuplicateKey error is accessible",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "5.1"
+        }
+      ],
+      "operations": [
+        {
+          "name": "aggregate",
+          "object": "database0",
+          "arguments": {
+            "pipeline": [
+              {
+                "$documents": [
+                  {
+                    "_id": 2,
+                    "x": 1
+                  }
+                ]
+              },
+              {
+                "$merge": {
+                  "into": "test",
+                  "whenMatched": "fail"
+                }
+              }
+            ]
+          },
+          "expectError": {
+            "errorCode": 11000,
+            "errorResponse": {
+              "keyPattern": {
+                "_id": 1
+              },
+              "keyValue": {
+                "_id": 2
+              }
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/bulkWrite-errorResponse.json b/tests/UnifiedSpecTests/crud/bulkWrite-errorResponse.json
new file mode 100644
index 000000000..b520f2404
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/bulkWrite-errorResponse.json
@@ -0,0 +1,87 @@
+{
+  "description": "bulkWrite-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "tests": [
+    {
+      "description": "bulkWrite operations support errorResponse assertions",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.0.0",
+          "topologies": [
+            "single",
+            "replicaset"
+          ]
+        },
+        {
+          "minServerVersion": "4.2.0",
+          "topologies": [
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 1
+              },
+              "data": {
+                "failCommands": [
+                  "insert"
+                ],
+                "errorCode": 8
+              }
+            }
+          }
+        },
+        {
+          "name": "bulkWrite",
+          "object": "collection0",
+          "arguments": {
+            "requests": [
+              {
+                "insertOne": {
+                  "document": {
+                    "_id": 1
+                  }
+                }
+              }
+            ]
+          },
+          "expectError": {
+            "errorCode": 8,
+            "errorResponse": {
+              "code": 8
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/deleteOne-errorResponse.json b/tests/UnifiedSpecTests/crud/deleteOne-errorResponse.json
new file mode 100644
index 000000000..045b27cfc
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/deleteOne-errorResponse.json
@@ -0,0 +1,81 @@
+{
+  "description": "deleteOne-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "tests": [
+    {
+      "description": "delete operations support errorResponse assertions",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.0.0",
+          "topologies": [
+            "single",
+            "replicaset"
+          ]
+        },
+        {
+          "minServerVersion": "4.2.0",
+          "topologies": [
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 1
+              },
+              "data": {
+                "failCommands": [
+                  "delete"
+                ],
+                "errorCode": 8
+              }
+            }
+          }
+        },
+        {
+          "name": "deleteOne",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "_id": 1
+            }
+          },
+          "expectError": {
+            "errorCode": 8,
+            "errorResponse": {
+              "code": 8
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/distinct-comment.json b/tests/UnifiedSpecTests/crud/distinct-comment.json
index 0669d4f30..11bce9ac9 100644
--- a/tests/UnifiedSpecTests/crud/distinct-comment.json
+++ b/tests/UnifiedSpecTests/crud/distinct-comment.json
@@ -64,7 +64,11 @@
               "key": "value"
             }
           },
-          "expectResult": [ 11, 22, 33 ]
+          "expectResult": [
+            11,
+            22,
+            33
+          ]
         }
       ],
       "expectEvents": [
@@ -105,7 +109,11 @@
             "filter": {},
             "comment": "comment"
           },
-          "expectResult": [ 11, 22, 33 ]
+          "expectResult": [
+            11,
+            22,
+            33
+          ]
         }
       ],
       "expectEvents": [
diff --git a/tests/UnifiedSpecTests/crud/findOneAndUpdate-errorResponse.json b/tests/UnifiedSpecTests/crud/findOneAndUpdate-errorResponse.json
new file mode 100644
index 000000000..5023a450f
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/findOneAndUpdate-errorResponse.json
@@ -0,0 +1,132 @@
+{
+  "description": "findOneAndUpdate-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "test",
+      "databaseName": "crud-tests",
+      "documents": [
+        {
+          "_id": 1,
+          "x": "foo"
+        }
+      ]
+    }
+  ],
+  "tests": [
+    {
+      "description": "findOneAndUpdate DuplicateKey error is accessible",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.2"
+        }
+      ],
+      "operations": [
+        {
+          "name": "createIndex",
+          "object": "collection0",
+          "arguments": {
+            "keys": {
+              "x": 1
+            },
+            "unique": true
+          }
+        },
+        {
+          "name": "findOneAndUpdate",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "_id": 2
+            },
+            "update": {
+              "$set": {
+                "x": "foo"
+              }
+            },
+            "upsert": true
+          },
+          "expectError": {
+            "errorCode": 11000,
+            "errorResponse": {
+              "keyPattern": {
+                "x": 1
+              },
+              "keyValue": {
+                "x": "foo"
+              }
+            }
+          }
+        }
+      ]
+    },
+    {
+      "description": "findOneAndUpdate document validation errInfo is accessible",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "5.0"
+        }
+      ],
+      "operations": [
+        {
+          "name": "modifyCollection",
+          "object": "database0",
+          "arguments": {
+            "collection": "test",
+            "validator": {
+              "x": {
+                "$type": "string"
+              }
+            }
+          }
+        },
+        {
+          "name": "findOneAndUpdate",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "_id": 1
+            },
+            "update": {
+              "$set": {
+                "x": 1
+              }
+            }
+          },
+          "expectError": {
+            "errorCode": 121,
+            "errorResponse": {
+              "errInfo": {
+                "failingDocumentId": 1,
+                "details": {
+                  "$$type": "object"
+                }
+              }
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/insertOne-errorResponse.json b/tests/UnifiedSpecTests/crud/insertOne-errorResponse.json
new file mode 100644
index 000000000..98f8830f6
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/insertOne-errorResponse.json
@@ -0,0 +1,81 @@
+{
+  "description": "insertOne-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "tests": [
+    {
+      "description": "insert operations support errorResponse assertions",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.0.0",
+          "topologies": [
+            "single",
+            "replicaset"
+          ]
+        },
+        {
+          "minServerVersion": "4.2.0",
+          "topologies": [
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 1
+              },
+              "data": {
+                "failCommands": [
+                  "insert"
+                ],
+                "errorCode": 8
+              }
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 1
+            }
+          },
+          "expectError": {
+            "errorCode": 8,
+            "errorResponse": {
+              "code": 8
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/crud/updateOne-errorResponse.json b/tests/UnifiedSpecTests/crud/updateOne-errorResponse.json
new file mode 100644
index 000000000..070d66dcf
--- /dev/null
+++ b/tests/UnifiedSpecTests/crud/updateOne-errorResponse.json
@@ -0,0 +1,86 @@
+{
+  "description": "updateOne-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "crud-tests"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "test"
+      }
+    }
+  ],
+  "tests": [
+    {
+      "description": "update operations support errorResponse assertions",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.0.0",
+          "topologies": [
+            "single",
+            "replicaset"
+          ]
+        },
+        {
+          "minServerVersion": "4.2.0",
+          "topologies": [
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 1
+              },
+              "data": {
+                "failCommands": [
+                  "update"
+                ],
+                "errorCode": 8
+              }
+            }
+          }
+        },
+        {
+          "name": "updateOne",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "_id": 1
+            },
+            "update": {
+              "$set": {
+                "x": 1
+              }
+            }
+          },
+          "expectError": {
+            "errorCode": 8,
+            "errorResponse": {
+              "code": 8
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/UnifiedSpecTests/valid-pass/expectedError-errorResponse.json b/tests/UnifiedSpecTests/valid-pass/expectedError-errorResponse.json
new file mode 100644
index 000000000..177b1baf5
--- /dev/null
+++ b/tests/UnifiedSpecTests/valid-pass/expectedError-errorResponse.json
@@ -0,0 +1,70 @@
+{
+  "description": "expectedError-errorResponse",
+  "schemaVersion": "1.12",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "test"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "coll0"
+      }
+    }
+  ],
+  "tests": [
+    {
+      "description": "Unsupported command",
+      "operations": [
+        {
+          "name": "runCommand",
+          "object": "database0",
+          "arguments": {
+            "commandName": "unsupportedCommand",
+            "command": {
+              "unsupportedCommand": 1
+            }
+          },
+          "expectError": {
+            "errorResponse": {
+              "errmsg": {
+                "$$type": "string"
+              }
+            }
+          }
+        }
+      ]
+    },
+    {
+      "description": "Unsupported query operator",
+      "operations": [
+        {
+          "name": "find",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "$unsupportedQueryOperator": 1
+            }
+          },
+          "expectError": {
+            "errorResponse": {
+              "errmsg": {
+                "$$type": "string"
+              }
+            }
+          }
+        }
+      ]
+    }
+  ]
+}