feat: Adding FaucetTransaction class (#9)

* feat: Adding FaucetTransaction class

src/coinbase/faucet_transaction.ts

@@ -0,0 +1,48 @@
+import { FaucetTransaction as FaucetTransactionModel } from "../client";
+import { InternalError } from "./errors";
+
+/**
+ * Represents a transaction from a faucet.
+ */
+export class FaucetTransaction {
+  private model: FaucetTransactionModel;
+
+  /**
+   * Creates a new FaucetTransaction instance.
+   * Do not use this method directly - instead, use Address.faucet().
+   * @constructor
+   * @param {FaucetTransactionModel} model - The FaucetTransaction model.
+   * @throws {InternalError} If the model does not exist.
+   */
+  constructor(model: FaucetTransactionModel) {
+    if (!model) {
+      throw new InternalError("FaucetTransaction model cannot be empty");
+    }
+    this.model = model;
+  }
+
+  /**
+   * Returns the transaction hash.
+   * @returns {string} The transaction hash.
+   */
+  public getTransactionHash(): string {
+    return this.model.transaction_hash;
+  }
+
+  /**
+   * Returns the link to the transaction on the blockchain explorer.
+   * @returns {string} The link to the transaction on the blockchain explorer
+   */
+  public getTransactionLink(): string {
+    // TODO: Parameterize this by Network.
+    return `https://sepolia.basescan.org/tx/${this.getTransactionHash()}`;
+  }
+
+  /**
+   * Returns a string representation of the FaucetTransaction.
+   * @returns {string} A string representation of the FaucetTransaction.
+   */
+  public toString(): string {
+    return `Coinbase::FaucetTransaction{transaction_hash: '${this.getTransactionHash()}', transaction_link: '${this.getTransactionLink()}'}`;
+  }
+}

src/coinbase/tests/faucetTransaction_test.ts

@@ -0,0 +1,21 @@
+import { InternalError } from "./../errors";
+import { FaucetTransaction } from "../faucet_transaction";
+
+describe("FaucetTransaction tests", () => {
+  it("should create a new FaucetTransaction instance and return the transaction hash", () => {
+    const faucetTransaction = new FaucetTransaction({
+      transaction_hash: "abc",
+    });
+
+    expect(faucetTransaction).toBeInstanceOf(FaucetTransaction);
+    expect(faucetTransaction.getTransactionHash()).toBe("abc");
+    expect(faucetTransaction.getTransactionLink()).toBe("https://sepolia.basescan.org/tx/abc");
+    expect(faucetTransaction.toString()).toBe(
+      "Coinbase::FaucetTransaction{transaction_hash: 'abc', transaction_link: 'https://sepolia.basescan.org/tx/abc'}",
+    );
+  });
+
+  it("should throw an InternalError if model is not provided", () => {
+    expect(() => new FaucetTransaction(null!)).toThrow(`FaucetTransaction model cannot be empty`);
+  });
+});