Add a test for `--offline` direct URLs (#2837)

crates/uv/tests/pip_compile.rs

@@ -4319,9 +4319,9 @@ fn matching_index_urls_requirements_txt() -> Result<()> {
     Ok(())
 }
 
-/// Resolve without network access via the `--offline` flag.
+/// Resolve a registry package without network access via the `--offline` flag.
 #[test]
-fn offline() -> Result<()> {
+fn offline_registry() -> Result<()> {
     let context = TestContext::new("3.12");
     let requirements_in = context.temp_dir.child("requirements.in");
     requirements_in.write_str("black==23.10.1")?;
@@ -4397,8 +4397,8 @@ fn offline() -> Result<()> {
     Ok(())
 }
 
-/// Resolve without network access via the `--offline` flag, using `--find-links` for an HTML
-/// registry.
+/// Resolve a package without network access via the `--offline` flag, using `--find-links` for an
+/// HTML registry.
 #[test]
 fn offline_find_links() -> Result<()> {
     let context = TestContext::new("3.12");
@@ -4449,6 +4449,61 @@ fn offline_find_links() -> Result<()> {
     Ok(())
 }
 
+/// Resolve a direct URL package without network access via the `--offline` flag.
+#[test]
+fn offline_direct_url() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let requirements_in = context.temp_dir.child("requirements.in");
+    requirements_in.write_str("iniconfig @ https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl")?;
+
+    // Resolve with `--offline` with an empty cache.
+    uv_snapshot!(context.compile()
+            .arg("requirements.in")
+            .arg("--offline"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Failed to download: iniconfig @ https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl
+      Caused by: Network connectivity is disabled, but the requested data wasn't found in the cache for: `https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl`
+    "###
+    );
+
+    // Populate the cache.
+    uv_snapshot!(context.compile()
+            .arg("requirements.in"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated by uv via the following command:
+    #    uv pip compile --cache-dir [CACHE_DIR] --exclude-newer 2024-03-25T00:00:00Z requirements.in
+    iniconfig @ https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl
+
+    ----- stderr -----
+    Resolved 1 package in [TIME]
+    "###
+    );
+
+    // Resolve with `--offline` with a populated cache.
+    uv_snapshot!(context.compile()
+            .arg("requirements.in")
+            .arg("--offline"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated by uv via the following command:
+    #    uv pip compile --cache-dir [CACHE_DIR] --exclude-newer 2024-03-25T00:00:00Z requirements.in --offline
+    iniconfig @ https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl
+
+    ----- stderr -----
+    Resolved 1 package in [TIME]
+    "###
+    );
+
+    Ok(())
+}
+
 /// Resolve nested `-r` requirements files with relative paths.
 #[test]
 fn compile_relative_subfile() -> Result<()> {
@@ -5847,6 +5902,28 @@ fn no_stream() -> Result<()> {
     Ok(())
 }
 
+/// Resolve a direct URL package with a URL that doesn't exist (i.e., returns a 404).
+#[test]
+fn not_found_direct_url() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let requirements_in = context.temp_dir.child("requirements.in");
+    requirements_in.write_str("iniconfig @ https://files.pythonhosted.org/packages/ef/a6/fake/iniconfig-2.0.0-py3-none-any.whl")?;
+
+    uv_snapshot!(context.compile()
+            .arg("requirements.in"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Failed to download: iniconfig @ https://files.pythonhosted.org/packages/ef/a6/fake/iniconfig-2.0.0-py3-none-any.whl
+      Caused by: HTTP status client error (404 Not Found) for url (https://files.pythonhosted.org/packages/ef/a6/fake/iniconfig-2.0.0-py3-none-any.whl)
+    "###
+    );
+
+    Ok(())
+}
+
 /// Raise an error when a direct URL dependency's `Requires-Python` constraint is not met.
 #[test]
 fn requires_python_direct_url() -> Result<()> {