1 files changed, 31 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/increase_time.ts b/packages/contracts/src/utils/increase_time.ts
new file mode 100644
index 000000000..4565d8dbc
--- /dev/null
+++ b/packages/contracts/src/utils/increase_time.ts
@@ -0,0 +1,31 @@
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+import { web3Wrapper } from './web3_wrapper';
+
+let firstAccount: string | undefined;
+
+/**
+ * Increases time by the given number of seconds and then mines a block so that
+ * the current block timestamp has the offset applied.
+ * @param seconds the number of seconds by which to incrase the time offset.
+ * @returns a new Promise which will resolve with the new total time offset or
+ * reject if the time could not be increased.
+ */
+export async function increaseTimeAndMineBlockAsync(seconds: number): Promise<number> {
+    if (_.isUndefined(firstAccount)) {
+        const accounts = await web3Wrapper.getAvailableAddressesAsync();
+        firstAccount = accounts[0];
+    }
+
+    const offset = await web3Wrapper.increaseTimeAsync(seconds);
+    // Note: we need to send a transaction after increasing time so
+    // that a block is actually mined. The contract looks at the
+    // last mined block for the timestamp.
+    await web3Wrapper.awaitTransactionSuccessAsync(
+        await web3Wrapper.sendTransactionAsync({ from: firstAccount, to: firstAccount, value: 0 }),
+        constants.AWAIT_TRANSACTION_MINED_MS,
+    );
+
+    return offset;
+}