Add test coverage

Author: zanieb

crates/uv/tests/it/tool_run.rs

@@ -2049,6 +2049,54 @@ fn tool_run_python_at_version() {
     "###);
 }
 
+#[test]
+fn tool_run_hint_version_not_available() {
+    let context = TestContext::new_with_versions(&[])
+        .with_filtered_counts()
+        .with_filtered_python_sources();
+
+    uv_snapshot!(context.filters(), context.tool_run()
+        .arg("[email protected]")
+        .env(EnvVars::UV_PYTHON_DOWNLOADS, "never"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: No interpreter found for Python 3.12 in [PYTHON SOURCES]
+
+    hint: A managed Python download is available for Python 3.12, but Python downloads are set to 'never'
+    ");
+
+    uv_snapshot!(context.filters(), context.tool_run()
+        .arg("[email protected]")
+        .env(EnvVars::UV_PYTHON_DOWNLOADS, "auto")
+        .env(EnvVars::UV_OFFLINE, "true"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: No interpreter found for Python 3.12 in [PYTHON SOURCES]
+
+    hint: A managed Python download is available for Python 3.12, but uv is set to offline mode
+    ");
+
+    uv_snapshot!(context.filters(), context.tool_run()
+        .arg("[email protected]")
+        .env(EnvVars::UV_PYTHON_DOWNLOADS, "auto")
+        .env(EnvVars::UV_NO_MANAGED_PYTHON, "true"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: No interpreter found for Python 3.12 in search path
+
+    hint: A managed Python download is available for Python 3.12, but the Python preference is set to 'only system'
+    ");
+}
+
 #[test]
 fn tool_run_python_from() {
     let context = TestContext::new_with_versions(&["3.12", "3.11"])