mypy: all of coverage/ and tests/ are checked

1 files changed, 27 insertions, 13 deletions

diff --git a/tests/plugin2.py b/tests/plugin2.py
index 60d16206..5cb8fbb6 100644
--- a/tests/plugin2.py
+++ b/tests/plugin2.py
@@ -3,9 +3,16 @@
 
 """A file tracer plugin for test_plugins.py to import."""
 
+from __future__ import annotations
+
 import os.path
 
-import coverage
+from types import FrameType
+from typing import Any, Optional, Set, Tuple
+
+from coverage import CoveragePlugin, FileReporter, FileTracer
+from coverage.plugin_support import Plugins
+from coverage.types import TLineNo
 
 try:
     import third.render                 # pylint: disable=unused-import
@@ -16,43 +23,50 @@ except ImportError:
     pass
 
 
-class Plugin(coverage.CoveragePlugin):
+class Plugin(CoveragePlugin):
     """A file tracer plugin for testing."""
-    def file_tracer(self, filename):
+    def file_tracer(self, filename: str) -> Optional[FileTracer]:
         if "render.py" in filename:
             return RenderFileTracer()
         return None
 
-    def file_reporter(self, filename):
-        return FileReporter(filename)
+    def file_reporter(self, filename: str) -> FileReporter:
+        return MyFileReporter(filename)
 
 
-class RenderFileTracer(coverage.FileTracer):
+class RenderFileTracer(FileTracer):
     """A FileTracer using information from the caller."""
 
-    def has_dynamic_source_filename(self):
+    def has_dynamic_source_filename(self) -> bool:
         return True
 
-    def dynamic_source_filename(self, filename, frame):
+    def dynamic_source_filename(
+        self,
+        filename: str,
+        frame: FrameType,
+    ) -> Optional[str]:
         if frame.f_code.co_name != "render":
             return None
-        source_filename = os.path.abspath(frame.f_locals['filename'])
+        source_filename: str = os.path.abspath(frame.f_locals['filename'])
         return source_filename
 
-    def line_number_range(self, frame):
+    def line_number_range(self, frame: FrameType) -> Tuple[TLineNo, TLineNo]:
         lineno = frame.f_locals['linenum']
         return lineno, lineno+1
 
 
-class FileReporter(coverage.FileReporter):
+class MyFileReporter(FileReporter):
     """A goofy file reporter."""
-    def lines(self):
+    def lines(self) -> Set[TLineNo]:
         # Goofy test arrangement: claim that the file has as many lines as the
         # number in its name.
         num = os.path.basename(self.filename).split(".")[0].split("_")[1]
         return set(range(1, int(num)+1))
 
 
-def coverage_init(reg, options):        # pylint: disable=unused-argument
+def coverage_init(
+    reg: Plugins,
+    options: Any,       # pylint: disable=unused-argument
+) -> None:
     """Called by coverage to initialize the plugins here."""
     reg.add_file_tracer(Plugin())