Add uv python list test cases (#12374)

Needed for 

- #12367
- #12375

Author: zanieb

crates/uv/tests/it/common/mod.rs

@@ -224,6 +224,27 @@ impl TestContext {
         self
     }
 
+    /// Add extra filtering for ` -> <PATH>` symlink display for Python versions in the test
+    /// context, e.g., for use in `uv python list`.
+    #[must_use]
+    pub fn with_filtered_python_symlinks(mut self) -> Self {
+        for (version, executable) in &self.python_versions {
+            if fs_err::symlink_metadata(executable).unwrap().is_symlink() {
+                self.filters.extend(
+                    Self::path_patterns(executable.read_link().unwrap())
+                        .into_iter()
+                        .map(|pattern| (format! {" -> {pattern}"}, String::new())),
+                );
+            }
+            // Drop links that are byproducts of the test context too
+            self.filters.push((
+                regex::escape(&format!(" -> [PYTHON-{version}]")),
+                String::new(),
+            ));
+        }
+        self
+    }
+
     /// Add extra standard filtering for a given path.
     #[must_use]
     pub fn with_filtered_path(mut self, path: &Path, name: &str) -> Self {
@@ -803,6 +824,18 @@ impl TestContext {
         command
     }
 
+    /// Create a `uv python list` command with options shared across scenarios.
+    pub fn python_list(&self) -> Command {
+        let mut command = self.new_command();
+        command
+            .arg("python")
+            .arg("list")
+            .env(EnvVars::UV_PYTHON_INSTALL_DIR, "")
+            .current_dir(&self.temp_dir);
+        self.add_shared_options(&mut command, false);
+        command
+    }
+
     /// Create a `uv python install` command with options shared across scenarios.
     pub fn python_install(&self) -> Command {
         let mut command = self.new_command();

crates/uv/tests/it/main.rs

@@ -72,6 +72,9 @@ mod python_dir;
 #[cfg(feature = "python")]
 mod python_find;
 
+#[cfg(feature = "python")]
+mod python_list;
+
 #[cfg(feature = "python-managed")]
 mod python_install;
 

crates/uv/tests/it/python_list.rs

@@ -0,0 +1,136 @@
+use uv_static::EnvVars;
+
+use crate::common::{uv_snapshot, TestContext};
+
+#[test]
+fn python_list() {
+    let mut context: TestContext = TestContext::new_with_versions(&["3.11", "3.12"])
+        .with_filtered_python_symlinks()
+        .with_filtered_python_keys();
+
+    uv_snapshot!(context.filters(), context.python_list().env(EnvVars::UV_TEST_PYTHON_PATH, ""), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    ");
+
+    // We show all interpreters
+    uv_snapshot!(context.filters(), context.python_list(), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+
+    // Swap the order of the Python versions
+    context.python_versions.reverse();
+
+    uv_snapshot!(context.filters(), context.python_list(), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+
+    // Request Python 3.11
+    uv_snapshot!(context.filters(), context.python_list().arg("3.11"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: unexpected argument '3.11' found
+
+    Usage: uv python list [OPTIONS]
+
+    For more information, try '--help'.
+    ");
+}
+
+#[test]
+fn python_list_pin() {
+    let context: TestContext = TestContext::new_with_versions(&["3.11", "3.12"])
+        .with_filtered_python_symlinks()
+        .with_filtered_python_keys();
+
+    // Pin to a version
+    uv_snapshot!(context.filters(), context.python_pin().arg("3.12"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    Pinned `.python-version` to `3.12`
+
+    ----- stderr -----
+    "###);
+
+    // The pin should not affect the listing
+    uv_snapshot!(context.filters(), context.python_list(), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+
+    // So `--no-config` has no effect
+    uv_snapshot!(context.filters(), context.python_list().arg("--no-config"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+}
+
+#[test]
+fn python_list_venv() {
+    let context: TestContext = TestContext::new_with_versions(&["3.11", "3.12"])
+        .with_filtered_python_symlinks()
+        .with_filtered_python_keys()
+        .with_filtered_exe_suffix()
+        .with_filtered_python_names()
+        .with_filtered_virtualenv_bin();
+
+    // Create a virtual environment
+    uv_snapshot!(context.filters(), context.venv().arg("--python").arg("3.12").arg("-q"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    "###);
+
+    // We should not display the virtual environment
+    uv_snapshot!(context.filters(), context.python_list(), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+
+    // Same if the `VIRTUAL_ENV` is not set (the test context includes it by default)
+    uv_snapshot!(context.filters(), context.python_list().env_remove(EnvVars::VIRTUAL_ENV), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    cpython-3.12.[X]-[PLATFORM]     [PYTHON-3.12]
+    cpython-3.11.[X]-[PLATFORM]    [PYTHON-3.11]
+
+    ----- stderr -----
+    ");
+}