diff --git a/tests/operations/tests/DeriveECDHKeyMaterial.mjs b/tests/operations/tests/DeriveECDHKeyMaterial.mjs
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+++ b/tests/operations/tests/DeriveECDHKeyMaterial.mjs
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+/**
+ * DeriveECDHKeyMaterial tests.
+ *
+ * Test vectors generated with Node.js WebCrypto (crypto.subtle) and cross-verified
+ * in both directions (Alice→Bob and Bob→Alice produce identical shared secrets).
+ *
+ * @author Jacob Marks
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+// Alice's P-256 private key (PKCS#8 PEM)
+const ALICE_PRIV_P256 = `-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg4HBsMvgcOvEQBrYJ
+dEXulke/dh5vYiOvfI41AToqfbWhRANCAAQgZgScW2pSpRRTOADLPL5D+8TF6xXx
+x9GDOE8V1xYj7arujDYH5935uCdVxXa84lUEw35+afHuh0bDmBDxolmx
+-----END PRIVATE KEY-----`;
+
+// Bob's P-256 public key (SPKI PEM)
+const BOB_PUB_P256 = `-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEa+FXJzzko0OZ9DcOaXpLzAkSt7bE
+XXVKQqYfsmuelH6QgH86dMR04/bvnhl4bF7YKbMWDlPRHs9haSeR/PhFNg==
+-----END PUBLIC KEY-----`;
+
+// Shared secret = x-coordinate of ECDH(Alice_priv, Bob_pub)
+const SHARED_SECRET_HEX = "4E030938FB1958545CCEFC98007DFB5F5780497161EB92D004391AF41D431ACF";
+
+// Concat KDF SHA-256 over the shared secret, 32 bytes output, no shared info
+const KDF_SHA256_32B_HEX = "61F4121E618428606D52ADC4626990A34BB59C14C4D14C3DD3AF5D082475FA85";
+
+TestRegister.addTests([
+    {
+        name: "Derive ECDH Key Material: P-256 raw shared secret (None KDF)",
+        input: ALICE_PRIV_P256,
+        expectedOutput: SHARED_SECRET_HEX,
+        recipeConfig: [
+            {
+                "op": "Derive ECDH Key Material",
+                "args": ["PEM", "P-256", "PEM", BOB_PUB_P256, "None", 32, "", "Hex"]
+            }
+        ]
+    },
+    {
+        name: "Derive ECDH Key Material: P-256 Concat KDF SHA-256 (32 bytes, no shared info)",
+        input: ALICE_PRIV_P256,
+        expectedOutput: KDF_SHA256_32B_HEX,
+        recipeConfig: [
+            {
+                "op": "Derive ECDH Key Material",
+                "args": ["PEM", "P-256", "PEM", BOB_PUB_P256, "Concat KDF SHA-256", 32, "", "Hex"]
+            }
+        ]
+    },
+    {
+        name: "Derive ECDH Key Material: missing peer public key returns error",
+        input: ALICE_PRIV_P256,
+        expectedOutput: "Missing key input.",
+        recipeConfig: [
+            {
+                "op": "Derive ECDH Key Material",
+                "args": ["PEM", "P-256", "PEM", "", "None", 32, "", "Hex"]
+            }
+        ]
+    },
+]);