diff --git a/unit_test/options_test.py b/unit_test/options_test.py
index f0fb5f63..59a46228 100644
--- a/unit_test/options_test.py
+++ b/unit_test/options_test.py
@@ -1,11 +1,14 @@
 from __future__ import annotations
 
+import os
 import platform as platform_module
 import textwrap
+from pathlib import Path
 
 import pytest
 
 from cibuildwheel.__main__ import get_build_identifiers
+from cibuildwheel.bashlex_eval import local_environment_executor
 from cibuildwheel.environment import parse_environment
 from cibuildwheel.options import Options, _get_pinned_container_images
 
@@ -133,16 +136,53 @@ def test_toml_environment_evil(tmp_path, monkeypatch, env_var_value):
     args = get_default_command_line_arguments()
     args.package_dir = tmp_path
 
-    with tmp_path.joinpath("pyproject.toml").open("w") as f:
-        f.write(
-            textwrap.dedent(
-                f"""\
-        [tool.cibuildwheel.environment]
-        EXAMPLE='''{env_var_value}'''
-        """
-            )
+    tmp_path.joinpath("pyproject.toml").write_text(
+        textwrap.dedent(
+            f"""\
+            [tool.cibuildwheel.environment]
+            EXAMPLE='''{env_var_value}'''
+            """
         )
+    )
 
     options = Options(platform="linux", command_line_arguments=args)
     parsed_environment = options.build_options(identifier=None).environment
     assert parsed_environment.as_dictionary(prev_environment={}) == {"EXAMPLE": env_var_value}
+
+
+@pytest.mark.parametrize(
+    "toml_assignment,result_value",
+    [
+        ('TEST_VAR="simple_value"', "simple_value"),
+        # spaces
+        ('TEST_VAR="simple value"', "simple value"),
+        # env var
+        ('TEST_VAR="$PARAM"', "spam"),
+        ('TEST_VAR="$PARAM $PARAM"', "spam spam"),
+        # env var extension
+        ('TEST_VAR="before:$PARAM:after"', "before:spam:after"),
+        # env var extension with spaces
+        ('TEST_VAR="before $PARAM after"', "before spam after"),
+    ],
+)
+def test_toml_environment_quoting(tmp_path: Path, toml_assignment, result_value):
+    args = get_default_command_line_arguments()
+    args.package_dir = tmp_path
+
+    tmp_path.joinpath("pyproject.toml").write_text(
+        textwrap.dedent(
+            f"""\
+            [tool.cibuildwheel.environment]
+            {toml_assignment}
+            """
+        )
+    )
+
+    options = Options(platform="linux", command_line_arguments=args)
+    parsed_environment = options.build_options(identifier=None).environment
+    environment_values = parsed_environment.as_dictionary(
+        prev_environment={**os.environ, "PARAM": "spam"},
+        executor=local_environment_executor,
+    )
+
+    assert environment_values["TEST_VAR"] == result_value