feat: add time advance call to anvil client

Author: ecPablo

framework/rpc/rpc.go

@@ -51,6 +51,21 @@ func New(url string, headers http.Header) *RPCClient {
 	}
 }
 
+// EVMIncreaseTime jumps forward in time by `seconds`.
+// The parameter is a JSON number (in seconds)
+func (m *RPCClient) EVMIncreaseTime(seconds uint64) error {
+	payload := map[string]interface{}{
+		"jsonrpc": "2.0",
+		"method":  "evm_increaseTime",
+		"params":  []interface{}{seconds},
+		"id":      rand.Int(),
+	}
+	if _, err := m.client.R().SetBody(payload).Post(m.URL); err != nil {
+		return errors.Wrap(err, "evm_increaseTime")
+	}
+	return nil
+}
+
 // AnvilAutoImpersonate sets auto impersonification to true or false
 func (m *RPCClient) AnvilAutoImpersonate(b bool) error {
 	//nolint:gosec

framework/rpc/rpc_test.go

@@ -243,4 +243,38 @@ func TestRPCAPI(t *testing.T) {
 			require.GreaterOrEqual(t, int64(block.Transactions().Len()), txnInBlock)
 		}
 	})
+
+	t.Run("(anvil) evm_increaseTime advances timestamp", func(t *testing.T) {
+		ac, err := StartAnvil([]string{"--no-mine"})
+		require.NoError(t, err)
+		client, err := ethclient.Dial(ac.URL)
+		require.NoError(t, err)
+
+		anvil := New(ac.URL, nil)
+
+		// Mine an initial block to establish a baseline timestamp
+		require.NoError(t, anvil.AnvilMine([]interface{}{1}))
+
+		// Read latest header/time
+		h1, err := client.HeaderByNumber(context.Background(), nil)
+		require.NoError(t, err)
+		t1 := h1.Time // uint64 (seconds)
+
+		// Jump forward in time, then mine exactly one block so the new timestamp is materialized
+		advance := uint64(60) // 1 minute
+		require.NoError(t, anvil.EVMIncreaseTime(advance))
+		require.NoError(t, anvil.AnvilMine([]interface{}{1}))
+
+		// Read new header/time
+		h2, err := client.HeaderByNumber(context.Background(), nil)
+		require.NoError(t, err)
+		t2 := h2.Time
+
+		// Assert the delta is at least the requested advance
+		// (Anvil should add exactly `advance`, but we allow >= to be safe.)
+		require.GreaterOrEqual(t, int64(t2-t1), int64(advance), "timestamp did not advance by expected seconds")
+
+		t.Logf("advanced time by %d seconds: %d -> %d (Δ=%d)", advance, t1, t2, t2-t1)
+	})
+
 }