Fix test_find_sources when run under site-packages

This was failing during wheel builds because we run the tests after installation (under `site-packages`), and this confused the module search logic. Hard code the paths to make this work in any install location.
python · JukkaL · Feb 11, 2021 · Feb 11, 2021 · Feb 11, 2021 · Feb 11, 2021
commit 81c322bd6b1f7da44110d29b5595c0766f9fecd9
diff --git a/mypy/test/test_find_sources.py b/mypy/test/test_find_sources.py
@@ -9,9 +9,16 @@
 from mypy.options import Options
 
 
+def make_abs(f: str) -> str:
+    """Turn f into an absolute fake path deterministically."""
+    # We don't want to depend on the current working directory, so no
+    # os.path.abspath.
+    return os.path.join(os.sep, 'fakeroot', f)
+
+
 class FakeFSCache(FileSystemCache):
     def __init__(self, files: Set[str]) -> None:
-        self.files = {os.path.abspath(f) for f in files}
+        self.files = {make_abs(f) for f in files}
 
     def isfile(self, file: str) -> bool:
         return file in self.files
@@ -49,13 +56,13 @@ def crawl(finder: SourceFinder, f: str) -> Tuple[str, str]:
 
 
 def find_sources_in_dir(finder: SourceFinder, f: str) -> List[Tuple[str, Optional[str]]]:
-    return normalise_build_source_list(finder.find_sources_in_dir(os.path.abspath(f)))
+    return normalise_build_source_list(finder.find_sources_in_dir(make_abs(f)))
 
 
 def find_sources(
     paths: List[str], options: Options, fscache: FileSystemCache
 ) -> List[Tuple[str, Optional[str]]]:
-    paths = [os.path.abspath(p) for p in paths]
+    paths = [make_abs(p) for p in paths]
     return normalise_build_source_list(create_source_list(paths, options, fscache))