diff --git a/jest-global-mock.ts b/jest-global-mock.ts
index 50412b2..34ace52 100644
--- a/jest-global-mock.ts
+++ b/jest-global-mock.ts
@@ -1,7 +1,3 @@
-/**
- * This is a sample test suite.
- * Replace this with your implementation.
- */
 import { exec } from 'child_process';
 import fetch from 'node-fetch';
 
diff --git a/src/platforms/npm-package/index.spec.ts b/src/platforms/npm-package/index.spec.ts
index 8411be6..60719e5 100644
--- a/src/platforms/npm-package/index.spec.ts
+++ b/src/platforms/npm-package/index.spec.ts
@@ -4,6 +4,14 @@
  */
 import { readNpmPackageDependencies, countNpmPackageDependants, analyze } from './index';
 
+const originalConsoleError = console.error;
+beforeAll(() => {
+  console.error = jest.fn();
+});
+afterAll(() => {
+  console.error = originalConsoleError;
+});
+
 describe('Npm package tests', () => {
   it('should not read a non-existent package', async () => {
     await expect(readNpmPackageDependencies('is-a-non-existent-package')).rejects.toEqual(
diff --git a/src/platforms/npm-package/index.ts b/src/platforms/npm-package/index.ts
index c8adec1..ad5d93f 100644
--- a/src/platforms/npm-package/index.ts
+++ b/src/platforms/npm-package/index.ts
@@ -29,7 +29,7 @@ export async function readNpmPackageDependencies(packageName: string): Promise<N
             }
             const resultJson = JSON.parse(resultStdout) as any;
             if (!!resultJson.error) {
-              throw new Error(`Cannot read ${packageName}.`);
+              throw resultJson.error;
             }
             resolve(
               Object.entries(resultJson as NpmDependency).map(([name, version]) => ({
@@ -39,12 +39,13 @@ export async function readNpmPackageDependencies(packageName: string): Promise<N
             );
             return Promise.resolve();
           } catch (error) {
-            return Promise.reject(new Error(`Cannot read ${packageName}.`));
+            return Promise.reject(error);
           }
         },
       );
       Promise.race([npmViewPromise, timeoutPromise])
-        .catch(() => {
+        .catch(error => {
+          console.error(error);
           if (retriedTimes < 5) {
             retriedTimes += 1;
             doReadTask();
@@ -84,13 +85,14 @@ export async function countNpmPackageDependants(packageName: string, version: st
             resolve(parseInt(match.replace(/,/g, ''), 10));
             return Promise.resolve();
           }
-          throw new Error(`Operation failed`);
+          throw new Error(`Cannot matches target text`);
         } catch (error) {
-          return Promise.reject(new Error(`Operation failed`));
+          return Promise.reject(error);
         }
       };
       Promise.race([fetchPromise(), timeoutPromise])
-        .catch(() => {
+        .catch(error => {
+          console.error(error);
           if (retriedTimes < 5) {
             retriedTimes += 1;
             doCountTask();