feat(GET MempoolAncestors): Added wrapper for full node RPC call

test/v3/blockchain.js

@@ -786,6 +786,56 @@ describe("#BlockchainRouter", () => {
     }
   })
 
+  describe("getMempoolAncestorsSingle()", () => {
+    // block route handler.
+    const getMempoolAncestorsSingle =
+      blockchainRoute.testableComponents.getMempoolAncestorsSingle
+
+    it("should throw 400 if txid is empty", async () => {
+      const result = await getMempoolAncestorsSingle(req, res)
+      //console.log(`result: ${util.inspect(result)}`)
+
+      assert.hasAllKeys(result, ["error"])
+      assert.include(result.error, "txid can not be empty")
+    })
+
+    it("should throw 503 when network issues", async () => {
+      // Save the existing RPC URL.
+      const savedUrl2 = process.env.RPC_BASEURL
+
+      // Manipulate the URL to cause a 500 network error.
+      process.env.RPC_BASEURL = "http://fakeurl/api/"
+
+      req.params.txid = `d65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde`
+
+      const result = await getMempoolAncestorsSingle(req, res)
+      //console.log(`result: ${util.inspect(result)}`)
+
+      // Restore the saved URL.
+      process.env.RPC_BASEURL = savedUrl2
+
+      assert.isAbove(res.statusCode, 499, "HTTP status code 503 expected.")
+      assert.include(
+        result.error,
+        "Could not communicate with full node",
+        "Error message expected"
+      )
+    })
+
+    it("should GET /getMempoolAncestorsSingle", async () => {
+      nock(`${process.env.RPC_BASEURL}`)
+        .post(uri => uri.includes("/"))
+        .reply(200, { result: mockData.mockAncestors })
+
+      req.params.txid = `bb0d349892d351da2767f8c45f6f7949713ff09bd12838d53e76158ddee3ce93`
+
+      const result = await getMempoolAncestorsSingle(req, res)
+      // console.log(`result: ${util.inspect(result)}`)
+
+      assert.isArray(result)
+    })
+  })
+
   describe("getTxOut()", () => {
     // block route handler.
     const getTxOut = blockchainRoute.testableComponents.getTxOut