test(capital): add test coverage for Capital API services

Added tests for GrantAccountsApi, GrantOffersApi, and GrantsApi.
Also exported CapitalAPI and capital typings.

Disclaimer: this content was generated with Gemini using a human-generated .patch from the Java
API.

Author: jeandersonbc

src/__tests__/grantAccountsApi.spec.ts

@@ -0,0 +1,54 @@
+import nock from "nock";
+import Client from "../client";
+import { createClient } from "../__mocks__/base";
+import { CapitalAPI } from "../services";
+
+let client: Client;
+let capitalApi: CapitalAPI;
+let scope: nock.Scope;
+
+beforeEach((): void => {
+    if (!nock.isActive()) {
+        nock.activate();
+    }
+    client = createClient();
+    scope = nock("https://balanceplatform-api-test.adyen.com/capital/v1");
+    capitalApi = new CapitalAPI(client);
+});
+
+afterEach(() => {
+    nock.cleanAll();
+});
+
+describe("GrantAccountsApi", (): void => {
+    it("should get grant account", async (): Promise<void> => {
+        scope.get("/grantAccounts/CG00000000000000000000001")
+            .reply(200, {
+                "id": "CG00000000000000000000001",
+                "fundingBalanceAccountId": "BA00000000000000000000001",
+                "limits": [
+                  {
+                    "amount": {
+                      "currency": "EUR",
+                      "value": 100000
+                    }
+                  }
+                ],
+                "balances": [
+                  {
+                    "currency": "EUR",
+                    "principal": 10000,
+                    "fee": 1000,
+                    "total": 11000
+                  }
+                ]
+            });
+
+        const response = await capitalApi.GrantAccountsApi.getGrantAccountInformation("CG00000000000000000000001");
+
+        expect(response.id).toBe("CG00000000000000000000001");
+        expect(response.fundingBalanceAccountId).toBe("BA00000000000000000000001");
+        expect(response.limits?.length).toBe(1);
+        expect(response.balances?.length).toBe(1);
+    });
+});

src/__tests__/grantOffersApi.spec.ts

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+import nock from "nock";
+import Client from "../client";
+import { createClient } from "../__mocks__/base";
+import { CapitalAPI } from "../services";
+
+let client: Client;
+let capitalApi: CapitalAPI;
+let scope: nock.Scope;
+
+beforeEach((): void => {
+    if (!nock.isActive()) {
+        nock.activate();
+    }
+    client = createClient();
+    scope = nock("https://balanceplatform-api-test.adyen.com/capital/v1");
+    capitalApi = new CapitalAPI(client);
+});
+
+afterEach(() => {
+    nock.cleanAll();
+});
+
+describe("GrantOffersApi", (): void => {
+    it("should get all grant offers with query param", async (): Promise<void> => {
+        scope.get("/grantOffers")
+            .query({ accountHolderId: "AH00000000000000000000001" })
+            .reply(200, {
+                "grantOffers": [
+                    {
+                        "id": "GO00000000000000000000001",
+                        "amount": {
+                            "currency": "EUR",
+                            "value": 10000
+                        },
+                        "fee": {
+                            "currency": "EUR",
+                            "value": 100
+                        },
+                        "repayment": {
+                            "currency": "EUR",
+                            "value": 10100
+                        }
+                    }
+                ]
+            });
+
+        const response = await capitalApi.GrantOffersApi.getAllGrantOffers("AH00000000000000000000001");
+
+        expect(response.grantOffers?.length).toBe(1);
+        expect(response.grantOffers?.[0].id).toBe("GO00000000000000000000001");
+    });
+
+    it("should get all grant offers without query param", async (): Promise<void> => {
+        scope.get("/grantOffers")
+            .reply(200, {
+                "grantOffers": [
+                    {
+                        "id": "GO00000000000000000000001",
+                        "amount": {
+                            "currency": "EUR",
+                            "value": 10000
+                        },
+                        "fee": {
+                            "currency": "EUR",
+                            "value": 100
+                        },
+                        "repayment": {
+                            "currency": "EUR",
+                            "value": 10100
+                        }
+                    }
+                ]
+            });
+
+        const response = await capitalApi.GrantOffersApi.getAllGrantOffers();
+
+        expect(response.grantOffers?.length).toBe(1);
+        expect(response.grantOffers?.[0].id).toBe("GO00000000000000000000001");
+    });
+
+    it("should get grant offer", async (): Promise<void> => {
+        scope.get("/grantOffers/GO00000000000000000000001")
+            .reply(200, {
+                "id": "GO00000000000000000000001",
+                "accountHolderId": "AH00000000000000000000001",
+                "contractType": "cashAdvance",
+                "amount": {
+                    "currency": "EUR",
+                    "value": 10000
+                },
+                "fee": {
+                    "amount": {
+                        "currency": "EUR",
+                        "value": 1000
+                    },
+                    "aprBasisPoints": 1200
+                },
+                "repayment": {
+                    "basisPoints": 1000,
+                    "term": {
+                        "estimatedDays": 180,
+                        "maximumDays": 365
+                    },
+                    "threshold": {
+                        "amount": {
+                            "currency": "EUR",
+                            "value": 1000
+                        }
+                    }
+                },
+                "startsAt": "2024-01-01T00:00:00Z",
+                "expiresAt": "2024-01-31T23:59:59Z"
+            });
+
+        const response = await capitalApi.GrantOffersApi.getGrantOffer("GO00000000000000000000001");
+
+        expect(response.id).toBe("GO00000000000000000000001");
+        expect(response.accountHolderId).toBe("AH00000000000000000000001");
+        expect(response.amount?.value).toBe(10000);
+    });
+});