add test for a write transaction with failing conditions

src/queryBuilders/__snapshots__/writeTransactionBuilder.integration.test.ts.snap

@@ -1,5 +1,7 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
+exports[`WriteTransactionBuilder > handles transaction with failing conditions 1`] = `[TransactionCanceledException: Transaction cancelled, please refer cancellation reasons for specific reasons [ConditionalCheckFailed]]`;
+
 exports[`WriteTransactionBuilder > handles transaction with puts 1`] = `
 [
   {

src/queryBuilders/writeTransactionBuilder.integration.test.ts

@@ -147,4 +147,27 @@ describe("WriteTransactionBuilder", () => {
 
     expect(result).toMatchSnapshot();
   });
+
+  it("handles transaction with failing conditions", async () => {
+    // Create a conflicting entry
+    await tsynamoClient
+      .putItem("myTable")
+      .item({ userId: "1", dataTimestamp: 2 })
+      .execute();
+
+    const trx = tsynamoClient.createWriteTransaction();
+
+    trx.addItem({
+      Put: tsynamoClient
+        .putItem("myTable")
+        .item({
+          userId: "1",
+          dataTimestamp: 2,
+          someBoolean: true,
+        })
+        .conditionExpression("userId", "attribute_not_exists"),
+    });
+
+    expect(trx.execute()).rejects.toMatchSnapshot();
+  });
 });

src/queryBuilders/writeTransactionBuilder.ts

@@ -7,7 +7,7 @@ import { UpdateItemQueryBuilder } from "./updateItemQueryBuilder";
 
 export interface WriteTransactionBuilderInterface<DDB> {
   /**
-   * TODO: ConditionCheck
+   * @todo add support for ConditionCheck items
    */
   addItem(item: {
     Put?: PutItemQueryBuilder<DDB, any, any>;