1 files changed, 77 insertions, 0 deletions
diff --git a/crates/shirabe/tests/plugin/e2e_http_downloader_test.rs b/crates/shirabe/tests/plugin/e2e_http_downloader_test.rs
new file mode 100644
index 00000000..ecb0b34c
--- /dev/null
+++ b/crates/shirabe/tests/plugin/e2e_http_downloader_test.rs
@@ -0,0 +1,77 @@
+//! HttpDownloader E2E compatibility check: upstream Composer and Shirabe each install a fixture
+//! project whose plugin builds its own `HttpDownloader` and writes what every call on it reports
+//! to a trace file. Upstream has no test that drives a downloader from plugin code, so the whole
+//! fixture is Shirabe-authored (`fixtures/e2e-http-downloader/`) and nothing has to be fetched;
+//! the test skips only while the PHP runtime or the Composer checkout is missing.
+
+use crate::e2e_extension_installer_test::{copy_dir, upstream_composer_bin};
+use crate::php_worker::{lock_php_worker, php_runtime_available};
+use std::path::{Path, PathBuf};
+use tempfile::TempDir;
+
+fn fixture_dir() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/plugin/fixtures/e2e-http-downloader")
+}
+
+struct Run {
+    exit_code: i32,
+    trace: String,
+}
+
+/// Runs `install` in a fresh copy of the fixture and returns the exit code with the plugin's trace.
+fn install(program: &str, prefix_args: &[&str]) -> Run {
+    let work = TempDir::new().unwrap();
+    copy_dir(&fixture_dir(), work.path());
+    let project = work.path().join("project");
+    let output = std::process::Command::new(program)
+        .args(prefix_args)
+        .arg("install")
+        .current_dir(&project)
+        .env("COMPOSER_HOME", work.path().join("home"))
+        .env("COMPOSER_CACHE_DIR", work.path().join("cache"))
+        .env("COMPOSER_NO_INTERACTION", "1")
+        .env("COLUMNS", "120")
+        .env("LINES", "30")
+        .output()
+        .unwrap();
+    Run {
+        exit_code: output.status.code().unwrap_or(-1),
+        trace: std::fs::read_to_string(project.join("http-downloader-trace.txt"))
+            .unwrap_or_default(),
+    }
+}
+
+#[test]
+fn test_plugin_owned_http_downloader_matches_upstream_composer() {
+    if !php_runtime_available() {
+        return;
+    }
+    let Some(composer_bin) = upstream_composer_bin() else {
+        return;
+    };
+    let _worker = lock_php_worker();
+    let composer_bin = composer_bin.to_str().unwrap().to_string();
+
+    let upstream = install("php", &[composer_bin.as_str()]);
+    let shirabe = install(env!("CARGO_BIN_EXE_shirabe"), &[]);
+
+    assert_eq!(0, upstream.exit_code, "upstream install must succeed");
+    assert_eq!(upstream.exit_code, shirabe.exit_code);
+    assert_eq!(upstream.trace, shirabe.trace);
+
+    // Pinned as well as compared, so a run where neither side wrote a trace cannot pass. The
+    // second options line is the evidence that both worlds merge into one value rather than each
+    // holding its own copy of the map.
+    assert_eq!(
+        "\
+event=post-update-cmd
+class=\"Composer\\\\Util\\\\HttpDownloader\" instanceof=true
+options header=[\"X-Probe: 1\"]
+options merged=[\"X-Probe: 2\"]
+isCurlEnabled=true
+hints other=null transport=null
+outputWarnings=ok
+",
+        upstream.trace
+    );
+}