feat: add tests in Chapter 2

tests/fig-2-2_simple-sycl-program.cpp

@@ -0,0 +1,38 @@
+// Figure 2-2. Simple SYCL program
+// from book - Data Parallel C++
+// https://link.springer.com/book/10.1007/978-1-4842-5574-2
+
+#include <array>
+#include <iostream>
+#include <sycl/sycl.hpp>
+
+int main() {
+  constexpr int size = 16;
+  std::array<int, size> data;
+
+  // Create queue on implementation-chosen default device
+  sycl::queue Q;
+
+  // Create buffer using host allocated "data" array
+  sycl::buffer B{data};
+
+  Q.submit([&](sycl::handler& h) {
+    sycl::accessor A{B, h};
+
+    h.parallel_for(size, [=](auto& idx) { A[idx] = idx; });
+  });
+
+  // Obtain access to buffer on the host
+  // Will wait for device kernel to execute to generate data
+  sycl::host_accessor A{B};
+
+  for (int i = 0; i < size; i++) {
+    std::cout << "data[" << i << "] = " << A[i] << "\n";
+    if (A[i] != i) {
+      std::cerr << "unexpected data at idx " << i << std::endl;
+      return -1;
+    }
+  }
+
+  return 0;
+}