From 7849a9859367dd87859f16e80294ec63bc60ad34 Mon Sep 17 00:00:00 2001
From: nigiri <168690269+0xnigir1@users.noreply.github.com>
Date: Wed, 28 Aug 2024 13:28:30 -0300
Subject: [PATCH] feat: dummy pricing provider

---
 packages/pricing/src/external.ts              |  2 +-
 .../pricing/src/providers/dummy.provider.ts   | 13 ++++++++++
 packages/pricing/src/providers/index.ts       |  1 +
 .../test/unit/services/dummy.provider.spec.ts | 25 +++++++++++++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 packages/pricing/src/providers/dummy.provider.ts
 create mode 100644 packages/pricing/test/unit/services/dummy.provider.spec.ts

diff --git a/packages/pricing/src/external.ts b/packages/pricing/src/external.ts
index 210c7be..7e4e301 100644
--- a/packages/pricing/src/external.ts
+++ b/packages/pricing/src/external.ts
@@ -2,4 +2,4 @@ export type { IPricingProvider, PriceResponse } from "./internal.js";
 
 export { RateLimitExceeded, ApiNotAvailable } from "./internal.js";
 
-export { CoingeckoProvider } from "./internal.js";
+export { CoingeckoProvider, DummyPricingProvider } from "./internal.js";
diff --git a/packages/pricing/src/providers/dummy.provider.ts b/packages/pricing/src/providers/dummy.provider.ts
new file mode 100644
index 0000000..606f444
--- /dev/null
+++ b/packages/pricing/src/providers/dummy.provider.ts
@@ -0,0 +1,13 @@
+import { Address } from "@zkchainhub/shared";
+
+import { IPricingProvider, PriceResponse } from "../internal.js";
+
+/**
+ * DummyPricingProvider class that implements the IPricingProvider interface.
+ * This provider returns a fixed price of 1 for each token address.
+ */
+export class DummyPricingProvider implements IPricingProvider {
+    async getTokenPrices(addresses: Address[]): Promise<PriceResponse> {
+        return Promise.resolve(Object.fromEntries(addresses.map((address) => [address, 1])));
+    }
+}
diff --git a/packages/pricing/src/providers/index.ts b/packages/pricing/src/providers/index.ts
index 7172e08..9c05289 100644
--- a/packages/pricing/src/providers/index.ts
+++ b/packages/pricing/src/providers/index.ts
@@ -1 +1,2 @@
 export * from "./coingecko.provider.js";
+export * from "./dummy.provider.js";
diff --git a/packages/pricing/test/unit/services/dummy.provider.spec.ts b/packages/pricing/test/unit/services/dummy.provider.spec.ts
new file mode 100644
index 0000000..87cb557
--- /dev/null
+++ b/packages/pricing/test/unit/services/dummy.provider.spec.ts
@@ -0,0 +1,25 @@
+import { beforeEach, describe, expect, it } from "vitest";
+
+import { Address } from "@zkchainhub/shared";
+
+import { DummyPricingProvider } from "../../../src/providers/dummy.provider";
+
+describe("DummyPricingProvider", () => {
+    let provider: DummyPricingProvider;
+
+    beforeEach(() => {
+        provider = new DummyPricingProvider();
+    });
+
+    it("return 1 for all token prices", async () => {
+        const addresses: Address[] = ["0x123456789", "0xabcdef123"];
+        const expectedResponse = {
+            "0x123456789": 1,
+            "0xabcdef123": 1,
+        };
+
+        const response = await provider.getTokenPrices(addresses);
+
+        expect(response).toEqual(expectedResponse);
+    });
+});