Add some tests for the dot printer.

tests/nbackend/test_dot_printing.py

@@ -5,12 +5,13 @@ from pystencils.backend.emission import emit_graph
     
 
 # FIXME how to automatically check for corectness? Is the test passed if a output is stored?
+# TODO setup some functionallity in different precision to test precision coloring.
 
 
 def test_emit_graph_simple_stencil_code(verbose: bool = False, quiet: bool = True) -> None:
     input_arr = np.random.rand(1024, 1024)
     output_arr = np.zeros_like(input_arr)
-    src, dst = ps.fields(src=input_arr, dst=output_arr)
+    src, dst = ps.fields("src, dst: single[2D]", src=input_arr, dst=output_arr) #FIXME using numpy arrays overrides the submitted type of this field.
     symbolic_description = ps.Assignment(dst[0,0], 
                                         (src[1, 0] + src[-1, 0] + src[0, 1] + src[0, -1]) / 4)
     kernel = ps.create_kernel(symbolic_description)
@@ -102,5 +103,4 @@ if __name__ == "__main__":
     test_emit_graph_Poission_kernel(verbose=False, quiet=False)
     test_emit_graph_RedBlack_GaussSeidel(verbose=False, quiet=False)
     test_emit_graph_CG(verbose=False, quiet=False)
-    emit_graph_temperature_transport(verbose=False, quiet=False)
-    # test_dot_ast_printer_RBGS(verbose=False, quiet=False)
\ No newline at end of file
+    emit_graph_temperature_transport(verbose=False, quiet=False)
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