Document and demonstrate execution controls

execution_timeout_contract_test.go

@@ -79,3 +79,22 @@ func TestPreparedExecutionRespectsCallerDeadline(t *testing.T) {
 		}
 	})
 }
+
+func TestPreparedExecutionDoesNotTimePreparation(t *testing.T) {
+	synctest.Test(t, func(t *testing.T) {
+		release := make(chan struct{})
+		reader := &capacityArtifactReader{entered: make(chan struct{}, 1), release: release}
+		engine := newBackendCapacityEngine(t, newCapacityGateClient(closedCapacityChannel(), 1), 1, capacityInt(0), reader)
+		req := capacityInputRequest("http://example.invalid/v1")
+		req.OperationTimeout = time.Second
+		go func() { time.Sleep(2 * time.Second); close(release) }()
+		start := time.Now()
+		handle, err := engine.PrepareExecution(context.Background(), req)
+		if err != nil || time.Since(start) != 2*time.Second {
+			t.Fatalf("prepare elapsed=%v error=%v", time.Since(start), err)
+		}
+		if _, err = engine.RunPrepared(context.Background(), handle); err != nil {
+			t.Fatalf("execution after preparation: %v", err)
+		}
+	})
+}