Update.

test/dataset/auto_schema.wren

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+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+
+var users = ds["users"]
+users.insert({"name": "Alice"})
+
+var cols1 = users.columns
+System.print(cols1.containsKey("uid")) // expect: true
+System.print(cols1.containsKey("name")) // expect: true
+System.print(cols1.containsKey("email")) // expect: false
+
+users.insert({"name": "Bob", "email": "bob@example.com"})
+
+var cols2 = users.columns
+System.print(cols2.containsKey("email")) // expect: true
+
+ds.close()

test/dataset/insert.wren

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+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+var users = ds["users"]
+
+var user = users.insert({"name": "Alice", "age": 30})
+System.print(user["name"]) // expect: Alice
+System.print(user["age"]) // expect: 30
+System.print(user["uid"] != null) // expect: true
+System.print(user["created_at"] != null) // expect: true
+
+var user2 = users.insert({"name": "Bob", "age": 25, "active": true})
+System.print(user2["name"]) // expect: Bob
+System.print(user2["active"]) // expect: true
+
+System.print(users.count()) // expect: 2
+
+ds.close()

test/dataset/query.wren

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+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+var users = ds["users"]
+
+users.insert({"name": "Alice", "age": 30})
+users.insert({"name": "Bob", "age": 25})
+users.insert({"name": "Charlie", "age": 35})
+
+var all = users.all()
+System.print(all.count) // expect: 3
+
+var found = users.find({"age__gt": 28})
+System.print(found.count) // expect: 2
+
+var alice = users.findOne({"name": "Alice"})
+System.print(alice["age"]) // expect: 30
+
+var young = users.find({"age__lt": 30})
+System.print(young.count) // expect: 1
+System.print(young[0]["name"]) // expect: Bob
+
+ds.close()

test/dataset/update_delete.wren

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+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+var users = ds["users"]
+
+var user = users.insert({"name": "Alice", "age": 30})
+var uid = user["uid"]
+
+users.update({"uid": uid, "age": 31})
+var updated = users.findOne({"uid": uid})
+System.print(updated["age"]) // expect: 31
+
+System.print(users.count()) // expect: 1
+System.print(users.delete(uid)) // expect: true
+System.print(users.count()) // expect: 0
+
+ds.close()