suppress error logging by providing NODE_ENV=test, relates to #78

Makefile

@@ -1,7 +1,7 @@
 .PHONY: coverage
 
 test:
-	./node_modules/jasme/run.js
+	npm test
 lint:
 	node_modules/eslint/bin/eslint.js src
 	node_modules/.bin/dtslint types

package.json

@@ -16,7 +16,7 @@
   ],
   "types": "types",
   "scripts": {
-    "test": "node_modules/jasme/run.js",
+    "test": "NODE_ENV=test node_modules/jasme/run.js",
     "lint": "eslint src",
     "coverage": "make coverage",
     "dtslint": "dtslint types",

spec/index.spec.js

@@ -414,8 +414,6 @@ describe('index', () => {
     const instance = bundle({});
     app.use(instance);
 
-    spyOn(console, 'error'); // mute console.error
-
     new promClient.Gauge({
       name: 'kaboom',
       help: 'this metric explodes',
@@ -424,6 +422,8 @@ describe('index', () => {
       }
     });
 
+    // the error will NOT be displayed if NODE_ENV=test (as defined in package.json)
+
     supertest(app)
       .get('/metrics')
       .expect(500)