diff --git a/server/src/http/project.rs b/server/src/http/project.rs
index eb04a70..7cdb77f 100644
--- a/server/src/http/project.rs
+++ b/server/src/http/project.rs
@@ -62,3 +62,143 @@ impl ProjectApi {
         Ok(Json(true))
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::http::context::AppContext;
+    use tempfile::TempDir;
+
+    fn make_api(dir: &TempDir) -> ProjectApi {
+        ProjectApi {
+            ctx: Arc::new(AppContext::new_test(dir.path().to_path_buf())),
+        }
+    }
+
+    #[tokio::test]
+    async fn get_current_project_returns_none_when_unset() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        // Clear the project root that new_test sets
+        api.close_project().await.unwrap();
+        let result = api.get_current_project().await.unwrap();
+        assert!(result.0.is_none());
+    }
+
+    #[tokio::test]
+    async fn get_current_project_returns_path_from_state() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let result = api.get_current_project().await.unwrap();
+        assert_eq!(result.0, Some(dir.path().to_string_lossy().to_string()));
+    }
+
+    #[tokio::test]
+    async fn open_project_succeeds_with_valid_directory() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let path = dir.path().to_string_lossy().to_string();
+        let payload = Json(PathPayload { path: path.clone() });
+        let result = api.open_project(payload).await.unwrap();
+        assert_eq!(result.0, path);
+    }
+
+    #[tokio::test]
+    async fn open_project_fails_with_nonexistent_file_path() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        // Create a file (not a directory) to trigger validation error
+        let file_path = dir.path().join("not_a_dir.txt");
+        std::fs::write(&file_path, "content").unwrap();
+        let payload = Json(PathPayload {
+            path: file_path.to_string_lossy().to_string(),
+        });
+        let result = api.open_project(payload).await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn close_project_returns_true() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let result = api.close_project().await.unwrap();
+        assert!(result.0);
+    }
+
+    #[tokio::test]
+    async fn close_project_clears_current_project() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+
+        // Verify project is set initially
+        let before = api.get_current_project().await.unwrap();
+        assert!(before.0.is_some());
+
+        // Close the project
+        api.close_project().await.unwrap();
+
+        // Verify project is now None
+        let after = api.get_current_project().await.unwrap();
+        assert!(after.0.is_none());
+    }
+
+    #[tokio::test]
+    async fn list_known_projects_returns_empty_initially() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        // Close the project so the store has no known projects
+        api.close_project().await.unwrap();
+        let result = api.list_known_projects().await.unwrap();
+        assert!(result.0.is_empty());
+    }
+
+    #[tokio::test]
+    async fn list_known_projects_returns_project_after_open() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let path = dir.path().to_string_lossy().to_string();
+
+        api.open_project(Json(PathPayload { path: path.clone() }))
+            .await
+            .unwrap();
+
+        let result = api.list_known_projects().await.unwrap();
+        assert!(result.0.contains(&path));
+    }
+
+    #[tokio::test]
+    async fn forget_known_project_removes_project() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let path = dir.path().to_string_lossy().to_string();
+
+        api.open_project(Json(PathPayload { path: path.clone() }))
+            .await
+            .unwrap();
+
+        let before = api.list_known_projects().await.unwrap();
+        assert!(before.0.contains(&path));
+
+        let result = api
+            .forget_known_project(Json(PathPayload { path: path.clone() }))
+            .await
+            .unwrap();
+        assert!(result.0);
+
+        let after = api.list_known_projects().await.unwrap();
+        assert!(!after.0.contains(&path));
+    }
+
+    #[tokio::test]
+    async fn forget_known_project_returns_true_for_nonexistent_path() {
+        let dir = TempDir::new().unwrap();
+        let api = make_api(&dir);
+        let result = api
+            .forget_known_project(Json(PathPayload {
+                path: "/some/unknown/path".to_string(),
+            }))
+            .await
+            .unwrap();
+        assert!(result.0);
+    }
+}