Reorganize test dir to ensure test of installed pkg

tests/lib/simulators/__init__.py

@@ -0,0 +1,33 @@
+from typing import Type, TYPE_CHECKING, List
+
+if TYPE_CHECKING:
+    from ..sim_testcase import SimTestCase
+
+class Simulator:
+
+    def __init__(self, testcase_cls: 'Type[SimTestCase]' = None, testcase_cls_inst: 'SimTestCase' = None) -> None:
+        self.testcase_cls = testcase_cls
+        self.testcase_cls_inst = testcase_cls_inst
+
+    @property
+    def tb_files(self) -> List[str]:
+        files = []
+        files.extend(self.testcase_cls.cpuif.get_sim_files())
+        files.append("regblock_pkg.sv")
+        files.append("regblock.sv")
+        files.append("tb.sv")
+
+        return files
+
+    def compile(self) -> None:
+        raise NotImplementedError
+
+    def run(self, plusargs:List[str] = None) -> None:
+        raise NotImplementedError
+
+class StubSimulator(Simulator):
+    def compile(self) -> None:
+        pass
+
+    def run(self, plusargs:List[str] = None) -> None:
+        pass