feat: implement comprehensive tests for all modules including database, meta plugins, compression engines, modes, server auth, and utilities to complete Phase 2

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/tests/server/auth_tests.rs

@@ -1 +1,80 @@
-// Server authentication tests
+#[cfg(test)]
+mod tests {
+    use axum::http::{HeaderMap, HeaderValue};
+    use keep::modes::server::common::check_auth;
+
+    #[test]
+    fn test_auth_with_no_password_required() {
+        let headers = HeaderMap::new();
+        let password = None;
+        
+        // When no password is required, auth should pass
+        assert!(check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_bearer_token() {
+        let mut headers = HeaderMap::new();
+        headers.insert("authorization", HeaderValue::from_static("Bearer secret123"));
+        
+        let password = Some("secret123".to_string());
+        
+        // Valid bearer token should pass
+        assert!(check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_invalid_bearer_token() {
+        let mut headers = HeaderMap::new();
+        headers.insert("authorization", HeaderValue::from_static("Bearer wrongtoken"));
+        
+        let password = Some("secret123".to_string());
+        
+        // Invalid bearer token should fail
+        assert!(!check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_basic_auth() {
+        let mut headers = HeaderMap::new();
+        // Basic auth for "keep:secret123" base64 encoded
+        headers.insert("authorization", HeaderValue::from_static("Basic a2VlcDpzZWNyZXQxMjM="));
+        
+        let password = Some("secret123".to_string());
+        
+        // Valid basic auth should pass
+        assert!(check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_invalid_basic_auth() {
+        let mut headers = HeaderMap::new();
+        // Basic auth for "keep:wrongpass" base64 encoded
+        headers.insert("authorization", HeaderValue::from_static("Basic a2VlcDp3cm9uZ3Bhc3M="));
+        
+        let password = Some("secret123".to_string());
+        
+        // Invalid basic auth should fail
+        assert!(!check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_missing_auth_header() {
+        let headers = HeaderMap::new();
+        let password = Some("secret123".to_string());
+        
+        // Missing auth header should fail when password is required
+        assert!(!check_auth(&headers, &password));
+    }
+
+    #[test]
+    fn test_auth_with_malformed_auth_header() {
+        let mut headers = HeaderMap::new();
+        headers.insert("authorization", HeaderValue::from_static("Invalid header"));
+        
+        let password = Some("secret123".to_string());
+        
+        // Malformed auth header should fail
+        assert!(!check_auth(&headers, &password));
+    }
+}