diff --git a/packages/client/tests/integration/01-discovery.test.ts b/packages/client/tests/integration/01-discovery.test.ts
index 699784287a..3a9e171ca2 100644
--- a/packages/client/tests/integration/01-discovery.test.ts
+++ b/packages/client/tests/integration/01-discovery.test.ts
@@ -36,9 +36,13 @@ describe('Discovery & Connection', () => {
       
       // Version should be a semantic version or API version string
       expect(discovery.version).toMatch(/^v?\d+/);
-      
-      // API name should be non-empty
-      expect(discovery.apiName.length).toBeGreaterThan(0);
+
+      // API name should be non-empty. `apiName` is optional on the discovery
+      // payload (spec `protocol.zod.ts` keeps it as the deprecated alias for
+      // `name`), so it is reached optionally and asserted — a missing value
+      // fails `toBeGreaterThan` rather than being waved through by a `!` or a
+      // `?? ''` default (#5449).
+      expect(discovery.apiName?.length).toBeGreaterThan(0);
     });
   });
 
@@ -56,13 +60,23 @@ describe('Discovery & Connection', () => {
     test('should resolve API routes from discovery info', async () => {
       const client = new ObjectStackClient({ baseUrl: TEST_SERVER_URL });
       await client.connect();
-      
-      // After connection, client should have discovery info
-      expect(client.discovery).toBeDefined();
-      expect(client.discovery?.version).toBeDefined();
-      
-      // Verify that subsequent API calls can be made (routes are resolved)
-      // This implicitly tests route resolution
+
+      // After connection, the client should have retained the discovery info.
+      // `ObjectStackClient` has no public `discovery` property — the one this
+      // case asserted until #5544 never existed on the class; the payload is
+      // held on the private `discoveryInfo` field (`src/index.ts`), which is
+      // what `getRoute()` steers every subsequent call with. It is read here
+      // through the bracket-notation escape hatch, exactly as this package's
+      // `src/client.hono.test.ts` already reads the same field — no public API
+      // is invented on behalf of a suite no type checker had ever compiled.
+      const discoveryInfo = client['discoveryInfo'];
+      expect(discoveryInfo).toBeDefined();
+      expect(discoveryInfo?.version).toBeDefined();
+
+      // Route resolution is what this case is named for: the routes map
+      // `getRoute()` reads has to be populated for subsequent API calls to be
+      // steered at all.
+      expect(discoveryInfo?.routes).toBeDefined();
     });
   });
 });
diff --git a/packages/client/tsconfig.test.json b/packages/client/tsconfig.test.json
index 2ec76f91f8..f9df0f8d54 100644
--- a/packages/client/tsconfig.test.json
+++ b/packages/client/tsconfig.test.json
@@ -24,14 +24,16 @@
 //     Nothing here may loosen a type rule; if a test does not compile, that is
 //     the finding.
 //
-// `include` deliberately stops at `src`, matching the build config's root, and
-// none of the files it leaves out carries a `@ts-expect-error`, so no pin is
-// hiding there. `tests/integration/` — the suite `vitest.integration.config.ts`
-// runs against a live server — is in no tsconfig at all: a second,
-// differently-shaped hole (1 file / 3 errors, one of them a real API drift, the
-// suite reading a `client.discovery` property `ObjectStackClient` does not
-// have) that wants its own change rather than a rider on this one. Filed as
-// #5544.
+// `include` covers BOTH test roots this package has. `src/**/*` is the layer
+// the build config excludes; `tests/**/*` is `tests/integration/`, the suite
+// `vitest.integration.config.ts` runs against a live server and the regular
+// `vitest.config.ts` excludes. Until #5544 it was named by no `include` and no
+// `exclude` anywhere — the #5476 shape, outside every program rather than
+// inside an excluded region — so neither vitest's regular run nor tsc ever read
+// it, and it had drifted onto a `client.discovery` property `ObjectStackClient`
+// does not have. Compiling it does NOT run it: the vitest split is unchanged,
+// the suite still needs a server. tsc reading a file is the cheaper of the two
+// gates and the only one that works without one.
 //
 // The per-file ledger beside this config (`test-typecheck-debt.json`) is small
 // on purpose. Under the repaired config the whole test layer came to 13 errors;
@@ -57,6 +59,6 @@
     "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "types": ["node"]
   },
-  "include": ["src/**/*"],
+  "include": ["src/**/*", "tests/**/*"],
   "exclude": ["node_modules", "dist"]
 }