Reorganize test dir to ensure test of installed pkg

tests/test_read_fanin/testcase.py

@@ -0,0 +1,37 @@
+from parameterized import parameterized_class
+
+from ..lib.sim_testcase import SimTestCase
+from ..lib.test_params import get_permutations
+
+
+PARAMS = get_permutations({
+    "regwidth" : [8, 16, 32, 64],
+})
+@parameterized_class(PARAMS)
+class TestFanin(SimTestCase):
+    retime_read_fanin = False
+    n_regs = 20
+    regwidth = 32
+
+    @classmethod
+    def setUpClass(cls):
+        cls.rdl_elab_params = {
+            "N_REGS": cls.n_regs,
+            "REGWIDTH": cls.regwidth,
+        }
+        super().setUpClass()
+
+    def test_dut(self):
+        self.run_test()
+
+
+PARAMS = get_permutations({
+    "n_regs" : [1, 4, 7, 9, 11],
+    "regwidth" : [8, 16, 32, 64],
+})
+@parameterized_class(PARAMS)
+class TestRetimedFanin(TestFanin):
+    retime_read_fanin = True
+
+    def test_dut(self):
+        self.run_test()