Update.

test/dataset/complex_queries.wren

@@ -0,0 +1,37 @@
+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+var products = ds["products"]
+
+for (i in 1..50) {
+    products.insert({
+        "name": "Product %(i)",
+        "price": i * 10,
+        "category": i % 3 == 0 ? "A" : (i % 3 == 1 ? "B" : "C"),
+        "active": i % 2 == 0
+    })
+}
+
+System.print(products.count()) // expect: 50
+
+var expensive = products.find({"price__gte": 400})
+System.print(expensive.count) // expect: 11
+
+var categoryA = products.find({"category": "A"})
+System.print(categoryA.count) // expect: 16
+
+var combined = products.find({"price__gte": 200, "price__lte": 300, "category": "B"})
+System.print(combined.count) // expect: 3
+
+var inList = products.find({"name__in": ["Product 1", "Product 10", "Product 50"]})
+System.print(inList.count) // expect: 3
+
+var like = products.find({"name__like": "Product 1\%"})
+System.print(like.count) // expect: 11
+
+var notEqual = products.find({"category__ne": "A", "active": true})
+System.print(notEqual.count) // expect: 17
+
+ds.close()

test/dataset/invalid_identifier.wren

@@ -0,0 +1,25 @@
+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+
+var fiber = Fiber.new {
+    var table = ds["users; DROP TABLE users; --"]
+}
+fiber.try()
+System.print(fiber.error != null) // expect: true
+
+var users = ds["users"]
+users.insert({"name": "Alice"})
+
+var fiber2 = Fiber.new {
+    users.insert({"field; DROP TABLE": "value"})
+}
+fiber2.try()
+System.print(fiber2.error != null) // expect: true
+
+var all = users.all()
+System.print(all.count) // expect: 1
+
+ds.close()

test/dataset/missing_column.wren

@@ -0,0 +1,23 @@
+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+import "tempfile" for TempFile
+import "io" for File
+
+var path = TempFile.mkstemp(".db")
+var ds = Dataset.open(path)
+
+var users = ds["users"]
+users.insert({"name": "Alice"})
+
+var result = users.find({"nonexistent": "value"})
+System.print(result.count) // expect: 0
+
+var one = users.findOne({"missing_col": "test"})
+System.print(one == null) // expect: true
+
+var all = users.all()
+System.print(all.count) // expect: 1
+
+ds.close()
+File.delete(path)

test/dataset/schema_evolution.wren

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+// retoor <retoor@molodetz.nl>
+
+import "dataset" for Dataset
+
+var ds = Dataset.memory()
+var users = ds["users"]
+
+var u1 = users.insert({"name": "Alice"})
+System.print(users.columns.containsKey("name")) // expect: true
+System.print(users.columns.containsKey("email")) // expect: false
+
+var u2 = users.insert({"name": "Bob", "email": "bob@example.com"})
+System.print(users.columns.containsKey("email")) // expect: true
+
+var u3 = users.insert({"name": "Charlie", "age": 30, "score": 95.5})
+System.print(users.columns.containsKey("age")) // expect: true
+System.print(users.columns.containsKey("score")) // expect: true
+
+var alice = users.findOne({"name": "Alice"})
+System.print(alice["email"] == null) // expect: true
+
+users.update({"uid": u1["uid"], "email": "alice@example.com", "verified": true})
+var aliceUpdated = users.findOne({"name": "Alice"})
+System.print(aliceUpdated["email"]) // expect: alice@example.com
+System.print(users.columns.containsKey("verified")) // expect: true
+
+System.print(users.count()) // expect: 3
+
+ds.close()

test/dataset/sql_injection.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", "score": 100})
+users.insert({"name": "Bob'; DROP TABLE users; --", "score": 50})
+
+var all = users.all()
+System.print(all.count) // expect: 2
+
+var found = users.findOne({"name": "Bob'; DROP TABLE users; --"})
+System.print(found["score"]) // expect: 50
+
+var afterAttack = users.all()
+System.print(afterAttack.count) // expect: 2
+
+ds.close()