Address review

Author: sobolevn

test-data/unit/check-custom-plugin.test

@@ -1098,3 +1098,15 @@ reveal_type(1)  # N: Revealed type is "Literal[1]?"
 [file mypy.ini]
 \[mypy]
 plugins=<ROOT>/test-data/unit/plugins/custom_errorcode.py
+
+
+[case testPyprojectPluginsTrailingComma]
+# flags: --config-file tmp/pyproject.toml
+[file pyproject.toml]
+# This test checks that trailing commas in string-based `plugins` are allowed.
+\[tool.mypy]
+plugins = """
+  <ROOT>/test-data/unit/plugins/function_sig_hook.py,
+  <ROOT>/test-data/unit/plugins/method_in_decorator.py,
+"""
+[out]

test-data/unit/cmdline.pyproject.test

@@ -151,17 +151,6 @@ y: int = 'y'  # E: Incompatible types in assignment (expression has type "str",
 z: int = 'z'
 [out]
 
-[case testPyprojectPluginsTrailingComma-posix]
-# cmd: mypy .
-[file pyproject.toml]
-# This test fails on windows for some reason, skipping it there.
-\[tool.mypy]
-plugins = """
-  <ROOT>/test-data/unit/plugins/function_sig_hook.py,
-  <ROOT>/test-data/unit/plugins/method_in_decorator.py,
-"""
-[out]
-
 [case testPyprojectAlwaysTrueTrailingComma]
 # cmd: mypy .
 [file pyproject.toml]