[Test] skip Alveo end2end tests if no Vitis

tests/end2end/test_end2end_bnn_pynq.py

@@ -343,6 +343,8 @@ class TestEnd2End:
     @pytest.mark.vivado
     @pytest.mark.parametrize("kind", ["zynq", "alveo"])
     def test_ipgen(self, topology, wbits, abits, kind):
+        if kind == "alveo" and ("VITIS_PATH" not in os.environ):
+            pytest.skip("VITIS_PATH not set")
         prev_chkpt_name = get_checkpoint_name(topology, wbits, abits, "fold")
         model = load_test_checkpoint_or_skip(prev_chkpt_name)
         test_fpga_part = get_build_env(kind, target_clk_ns)["part"]
@@ -355,6 +357,8 @@ class TestEnd2End:
     @pytest.mark.vivado
     @pytest.mark.parametrize("kind", ["zynq", "alveo"])
     def test_ipstitch_rtlsim(self, topology, wbits, abits, kind):
+        if kind == "alveo" and ("VITIS_PATH" not in os.environ):
+            pytest.skip("VITIS_PATH not set")
         prev_chkpt_name = get_checkpoint_name(topology, wbits, abits, "ipgen_" + kind)
         model = load_test_checkpoint_or_skip(prev_chkpt_name)
         test_fpga_part = get_build_env(kind, target_clk_ns)["part"]
@@ -375,7 +379,9 @@ class TestEnd2End:
                 "rtlsim_trace", "%s_w%da%d.vcd" % (topology, wbits, abits)
             )
             os.environ["RTLSIM_TRACE_DEPTH"] = "3"
-        rtlsim_chkpt = get_checkpoint_name(topology, wbits, abits, "ipstitch_rtlsim_" + kind)
+        rtlsim_chkpt = get_checkpoint_name(
+            topology, wbits, abits, "ipstitch_rtlsim_" + kind
+        )
         model.save(rtlsim_chkpt)
         parent_chkpt = get_checkpoint_name(topology, wbits, abits, "dataflow_parent")
         (input_tensor_npy, output_tensor_npy) = get_golden_io_pair(
@@ -391,7 +397,11 @@ class TestEnd2End:
     @pytest.mark.vivado
     @pytest.mark.parametrize("kind", ["zynq", "alveo"])
     def test_throughput_rtlsim(self, topology, wbits, abits, kind):
-        prev_chkpt_name = get_checkpoint_name(topology, wbits, abits, "ipstitch_rtlsim_" + kind)
+        if kind == "alveo" and ("VITIS_PATH" not in os.environ):
+            pytest.skip("VITIS_PATH not set")
+        prev_chkpt_name = get_checkpoint_name(
+            topology, wbits, abits, "ipstitch_rtlsim_" + kind
+        )
         model = load_test_checkpoint_or_skip(prev_chkpt_name)
         n_nodes = len(model.graph.node)
         perf_est = model.analysis(dataflow_performance)