added test library

src/CMakeLists.txt

@@ -1,2 +1,5 @@
-add_library(diffusion OBJECT diffusion.cpp)
+add_library(diffusion OBJECT diffusion.cpp diffusion.hpp)
 target_link_libraries(diffusion Eigen3::Eigen)
+
+add_executable(test main.cpp)
+target_link_libraries(test PUBLIC diffusion)

src/main.cpp

@@ -0,0 +1,20 @@
+#include "diffusion.hpp"
+#include <cmath>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+  int x = 10;
+  int y = 10;
+
+  std::vector<double> alpha(x * y, 1.5 * pow(10, -9));
+  std::vector<double> input(x * y, 0);
+  input[x + 1] = 5 * std::pow(10, 6);
+
+  BTCS2D(x, y, input, alpha, 10.);
+
+  return 0;
+}