Add a test for reading pyproject.toml recursively

Author: Felixoid

test-data/unit/cmdline.pyproject.test

@@ -133,3 +133,55 @@ Neither is this!
 description = "Factory ⸻ A code generator 🏭"
 \[tool.mypy]
 [file x.py]
+
+[case testSearchRecursively]
+# cmd: mypy x.py
+[file ../pyproject.toml]
+\[tool.mypy]
+\[tool.mypy.overrides]
+module = "x"
+disallow_untyped_defs = false
+[file x.py]
+pass
+[out]
+../pyproject.toml: tool.mypy.overrides sections must be an array. Please make sure you are using double brackets like so: [[tool.mypy.overrides]]
+== Return code: 0
+
+[case testSearchRecursivelyStopsGit]
+# cmd: mypy x
+[file .git/test]
+[file ../pyproject.toml]
+\[tool.mypy]
+\[tool.mypy]
+exclude = '''(?x)(
+    (^|/)[^/]*skipme_\.py$
+    |(^|/)_skipme[^/]*\.py$
+)'''
+[file x/__init__.py]
+i: int = 0
+[file x/_skipme_please.py]
+This isn't even syntatically valid!
+[file x/please_skipme_.py]
+Neither is this!
+[out]
+x/_skipme_please.py:1: error: unterminated string literal (detected at line 1)
+== Return code: 2
+
+[case testSearchRecursivelyStopsHg]
+# cmd: mypy x
+[file .hg/test]
+[file ../pyproject.toml]
+\[tool.mypy]
+exclude = '''(?x)(
+    (^|/)[^/]*skipme_\.py$
+    |(^|/)_skipme[^/]*\.py$
+)'''
+[file x/__init__.py]
+i: int = 0
+[file x/_skipme_please.py]
+This isn't even syntatically valid!
+[file x/please_skipme_.py]
+Neither is this!
+[out]
+x/_skipme_please.py:1: error: unterminated string literal (detected at line 1)
+== Return code: 2