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diff --git a/src/irmd/oap/tests/common.h b/src/irmd/oap/tests/common.h
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+++ b/src/irmd/oap/tests/common.h
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2026
+ *
+ * Common test helper functions for OAP tests
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#ifndef IRMD_TESTS_COMMON_H
+#define IRMD_TESTS_COMMON_H
+
+#include <ouroboros/utils.h>
+#include <ouroboros/flow.h>
+#include <ouroboros/name.h>
+#include <test/test.h>
+
+#include <stdbool.h>
+
+/* Per-side security configuration for tests */
+struct test_sec_cfg {
+        int  kex;       /* KEX algorithm NID */
+        int  cipher;    /* Cipher NID for encryption */
+        int  kdf;       /* KDF NID for key derivation */
+        int  md;        /* Digest NID for signatures */
+        int  kem_mode;  /* KEM encapsulation mode (0 for ECDH) */
+        bool auth;      /* Use authentication (certificates) */
+};
+
+/* Test configuration - set by each test before running roundtrip */
+extern struct test_cfg {
+        struct test_sec_cfg srv;
+        struct test_sec_cfg cli;
+} test_cfg;
+
+/* Each test file defines this with its own certificates */
+extern int mock_load_credentials(void ** pkp,
+                                 void ** crt);
+
+/* Per-side test context */
+struct oap_test_side {
+        struct name_info info;
+        struct flow_info flow;
+        uint8_t          key[SYMMKEYSZ];
+        int              nid;
+        void *           state;
+};
+
+/* Test context - holds all common state for OAP tests */
+struct oap_test_ctx {
+        struct oap_test_side srv;
+        struct oap_test_side cli;
+
+        buffer_t             req_hdr;
+        buffer_t             resp_hdr;
+        buffer_t             data;
+        void *               root_ca;
+        void *               im_ca;
+};
+
+int  oap_test_setup(struct oap_test_ctx * ctx,
+                    const char *          root_ca_str,
+                    const char *          im_ca_str);
+
+void oap_test_teardown(struct oap_test_ctx * ctx);
+
+int  oap_cli_prepare_ctx(struct oap_test_ctx * ctx);
+
+int  oap_srv_process_ctx(struct oap_test_ctx * ctx);
+
+int  oap_cli_complete_ctx(struct oap_test_ctx * ctx);
+
+int  roundtrip_auth_only(const char * root_ca,
+                         const char * im_ca_str);
+
+int  roundtrip_kex_only(void);
+
+int  corrupted_request(const char * root_ca,
+                       const char * im_ca_str);
+
+int  corrupted_response(const char * root_ca,
+                        const char * im_ca_str);
+
+int  truncated_request(const char * root_ca,
+                       const char * im_ca_str);
+
+#endif /* IRMD_TESTS_COMMON_H */