mypy: all of coverage/ and tests/ are checked

1 files changed, 22 insertions, 13 deletions

diff --git a/tests/plugin1.py b/tests/plugin1.py
index 3283fbda..4848eaff 100644
--- a/tests/plugin1.py
+++ b/tests/plugin1.py
@@ -3,28 +3,34 @@
 
 """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, Union
 
+from coverage import CoveragePlugin, FileReporter, FileTracer
+from coverage.plugin_support import Plugins
+from coverage.types import TLineNo
 
-class Plugin(coverage.CoveragePlugin):
+class Plugin(CoveragePlugin):
     """A file tracer plugin to import, so that it isn't in the test's current directory."""
 
-    def file_tracer(self, filename):
+    def file_tracer(self, filename: str) -> Optional[FileTracer]:
         """Trace only files named xyz.py"""
         if "xyz.py" in filename:
-            return FileTracer(filename)
+            return MyFileTracer(filename)
         return None
 
-    def file_reporter(self, filename):
-        return FileReporter(filename)
+    def file_reporter(self, filename: str) -> Union[FileReporter, str]:
+        return MyFileReporter(filename)
 
 
-class FileTracer(coverage.FileTracer):
+class MyFileTracer(FileTracer):
     """A FileTracer emulating a simple static plugin."""
 
-    def __init__(self, filename):
+    def __init__(self, filename: str) -> None:
         """Claim that */*xyz.py was actually sourced from /src/*ABC.zz"""
         self._filename = filename
         self._source_filename = os.path.join(
@@ -32,21 +38,24 @@ class FileTracer(coverage.FileTracer):
             os.path.basename(filename.replace("xyz.py", "ABC.zz"))
         )
 
-    def source_filename(self):
+    def source_filename(self) -> str:
         return self._source_filename
 
-    def line_number_range(self, frame):
+    def line_number_range(self, frame: FrameType) -> Tuple[TLineNo, TLineNo]:
         """Map the line number X to X05,X06,X07."""
         lineno = frame.f_lineno
         return lineno*100+5, lineno*100+7
 
 
-class FileReporter(coverage.FileReporter):
+class MyFileReporter(FileReporter):
     """Dead-simple FileReporter."""
-    def lines(self):
+    def lines(self) -> Set[TLineNo]:
         return {105, 106, 107, 205, 206, 207}
 
 
-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())