TASK22104: slice3 add failure-path api contract tests

tests/phase21/api-contract-slice1.test.cjs

@@ -371,6 +371,72 @@ test("downloadblob handler success sets attachment header and returns body", asy
     assert.strictEqual(res.state.sentBody.toString(), "file-content");
 });
 
+test("apiResponse.respondError default contract returns 500 envelope", () => {
+    const mod = loadModule("pages/api/middleware/apiResponse.js");
+    const res = createRes();
+
+    mod.respondError(res);
+
+    assert.strictEqual(res.state.statusCode, 500);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        success: false,
+        error: {
+            code: "INTERNAL_SERVER_ERROR",
+            message: "Request failed"
+        }
+    });
+});
+
+test("upload handler dependency failure returns UPLOAD_FAILED", async () => {
+    const mod = loadModule("pages/api/file/upload.js", {
+        nextConnect: createNextConnectMock(),
+        middleware: () => {},
+        hashAPIPath: () => "?hash=expected",
+        respondError: respondErrorMock,
+        respondSuccess: respondSuccessMock,
+        createBlob: async () => {
+            throw new Error("storage down");
+        },
+        createRepBlob: async () => ({ id: "rep-1" })
+    });
+
+    const req = {
+        query: { hash: "expected" },
+        body: {
+            appealData: { key: "value" },
+            containerID: ["c1"],
+            casefolderID: ["f1"],
+            repOrAppeal: false
+        }
+    };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(res.state.jsonBody.error.code, "UPLOAD_FAILED");
+});
+
+test("setupcontainer dependency failure returns SETUP_CONTAINER_FAILED", async () => {
+    const mod = loadModule("pages/api/file/setupcontainer.js", {
+        nextConnect: createNextConnectMock(),
+        middleware: () => {},
+        hashAPIPath: () => "&hash=expected",
+        consoleLogger: () => {},
+        respondError: respondErrorMock,
+        respondSuccess: respondSuccessMock,
+        createContainer: async () => {
+            throw new Error("container failed");
+        }
+    });
+
+    const req = { query: { ident: "cont-1", hash: "expected" } };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(res.state.jsonBody.error.code, "SETUP_CONTAINER_FAILED");
+});
+
 const run = async () => {
     let passed = 0;