1 files changed, 125 insertions, 0 deletions
diff --git a/tests/integration/cache.rs b/tests/integration/cache.rs
new file mode 100644
index 0000000..42d2a15
--- /dev/null
+++ b/tests/integration/cache.rs
@@ -0,0 +1,125 @@
+use crate::git_helpers::create_local_repo;
+use crate::harness::{SiteBuilder, TestServer, test_config_with_site};
+use crate::runtime::{skip_without_git, skip_without_runtime};
+use std::time::Duration;
+use witryna::config::sanitize_cache_dir_name;
+
+#[tokio::test]
+async fn cache_dir_persists_across_builds() {
+    skip_without_git!();
+    skip_without_runtime!();
+
+    let tempdir = tempfile::tempdir().unwrap();
+    let base_dir = tempdir.path().to_path_buf();
+
+    let repo_dir = tempdir.path().join("repos");
+    tokio::fs::create_dir_all(&repo_dir).await.unwrap();
+    let repo_url = create_local_repo(&repo_dir, "main").await;
+
+    let site = SiteBuilder::new("cache-site", &repo_url, "cache-token")
+        .overrides(
+            "alpine:latest",
+            "mkdir -p /tmp/test-cache && echo 'cached' > /tmp/test-cache/marker && mkdir -p out && cp /tmp/test-cache/marker out/marker",
+            "out",
+        )
+        .cache_dirs(vec!["/tmp/test-cache".to_owned()])
+        .build();
+
+    let server = TestServer::start(test_config_with_site(base_dir.clone(), site)).await;
+
+    // --- Build 1: create marker in cache ---
+    let resp = TestServer::client()
+        .post(server.url("/cache-site"))
+        .header("Authorization", "Bearer cache-token")
+        .send()
+        .await
+        .unwrap();
+    assert_eq!(resp.status().as_u16(), 202);
+
+    // Wait for build to complete
+    let builds_dir = base_dir.join("builds/cache-site");
+    let max_wait = Duration::from_secs(120);
+    let start = std::time::Instant::now();
+
+    loop {
+        assert!(
+            start.elapsed() <= max_wait,
+            "build 1 timed out after {max_wait:?}"
+        );
+        if builds_dir.join("current").is_symlink() {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(500)).await;
+    }
+
+    // Verify built output
+    let target = tokio::fs::read_link(builds_dir.join("current"))
+        .await
+        .unwrap();
+    assert!(
+        target.join("marker").exists(),
+        "marker should exist in build output"
+    );
+
+    // Host-side verification: cache directory should exist with marker
+    let sanitized = sanitize_cache_dir_name("/tmp/test-cache");
+    let host_cache_dir = base_dir.join("cache/cache-site").join(&sanitized);
+    assert!(
+        host_cache_dir.join("marker").exists(),
+        "marker should exist in host cache dir: {}",
+        host_cache_dir.display()
+    );
+
+    // --- Build 2: verify marker was already there (cache persisted) ---
+    // Wait for build lock to release
+    let start = std::time::Instant::now();
+    loop {
+        if start.elapsed() > Duration::from_secs(10) {
+            break;
+        }
+        if !server
+            .state
+            .build_scheduler
+            .in_progress
+            .contains("cache-site")
+        {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(200)).await;
+    }
+
+    let resp = TestServer::client()
+        .post(server.url("/cache-site"))
+        .header("Authorization", "Bearer cache-token")
+        .send()
+        .await
+        .unwrap();
+    assert_eq!(resp.status().as_u16(), 202);
+
+    // Wait for second build to complete (symlink target changes)
+    let first_target = target;
+    let start = std::time::Instant::now();
+    loop {
+        assert!(
+            start.elapsed() <= max_wait,
+            "build 2 timed out after {max_wait:?}"
+        );
+        if let Ok(new_target) = tokio::fs::read_link(builds_dir.join("current")).await
+            && new_target != first_target
+        {
+            // Verify marker still in output
+            assert!(
+                new_target.join("marker").exists(),
+                "marker should exist in second build output (cache persisted)"
+            );
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(500)).await;
+    }
+
+    // Host-side: cache dir still has marker
+    assert!(
+        host_cache_dir.join("marker").exists(),
+        "marker should still exist in host cache dir after build 2"
+    );
+}