[ty] Add regression test for fixed pyvenv.cfg parsing bug (#18157)

Author: AlexWaygood

crates/ty_python_semantic/src/site_packages.rs

@@ -626,6 +626,7 @@ mod tests {
     struct VirtualEnvironmentTestCase {
         system_site_packages: bool,
         pyvenv_cfg_version_field: Option<&'static str>,
+        command_field: Option<&'static str>,
     }
 
     struct PythonEnvironmentTestCase {
@@ -677,6 +678,7 @@ mod tests {
             let Some(VirtualEnvironmentTestCase {
                 pyvenv_cfg_version_field,
                 system_site_packages,
+                command_field,
             }) = virtual_env
             else {
                 return system_install_sys_prefix;
@@ -703,6 +705,10 @@ mod tests {
                 pyvenv_cfg_contents.push_str(version_field);
                 pyvenv_cfg_contents.push('\n');
             }
+            if let Some(command_field) = command_field {
+                pyvenv_cfg_contents.push_str(command_field);
+                pyvenv_cfg_contents.push('\n');
+            }
             // Deliberately using weird casing here to test that our pyvenv.cfg parsing is case-insensitive:
             if *system_site_packages {
                 pyvenv_cfg_contents.push_str("include-system-site-packages = TRuE\n");
@@ -934,6 +940,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: false,
                 pyvenv_cfg_version_field: None,
+                command_field: None,
             }),
         };
         test.run();
@@ -949,6 +956,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: false,
                 pyvenv_cfg_version_field: Some("version = 3.12"),
+                command_field: None,
             }),
         };
         test.run();
@@ -964,6 +972,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: false,
                 pyvenv_cfg_version_field: Some("version_info = 3.12"),
+                command_field: None,
             }),
         };
         test.run();
@@ -979,6 +988,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: false,
                 pyvenv_cfg_version_field: Some("version_info = 3.12.0rc2"),
+                command_field: None,
             }),
         };
         test.run();
@@ -994,6 +1004,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: false,
                 pyvenv_cfg_version_field: Some("version_info = 3.13"),
+                command_field: None,
             }),
         };
         test.run();
@@ -1009,6 +1020,7 @@ mod tests {
             virtual_env: Some(VirtualEnvironmentTestCase {
                 system_site_packages: true,
                 pyvenv_cfg_version_field: Some("version_info = 3.13"),
+                command_field: None,
             }),
         };
         test.run();
@@ -1096,6 +1108,25 @@ mod tests {
         );
     }
 
+    /// See <https://github.com/astral-sh/ty/issues/430>
+    #[test]
+    fn parsing_pyvenv_cfg_with_equals_in_value() {
+        let test = PythonEnvironmentTestCase {
+            system: TestSystem::default(),
+            minor_version: 13,
+            free_threaded: true,
+            origin: SysPrefixPathOrigin::VirtualEnvVar,
+            virtual_env: Some(VirtualEnvironmentTestCase {
+                system_site_packages: true,
+                pyvenv_cfg_version_field: Some("version_info = 3.13"),
+                command_field: Some(
+                    r#"command = /.pyenv/versions/3.13.3/bin/python3.13 -m venv --without-pip --prompt="python-default/3.13.3" /somewhere-else/python/virtualenvs/python-default/3.13.3"#,
+                ),
+            }),
+        };
+        test.run();
+    }
+
     #[test]
     fn parsing_pyvenv_cfg_with_key_but_no_value_fails() {
         let system = TestSystem::default();