[test] Remove <index.ts> files from test coverage

These files will only contain simple startup code that is really hard
to test and comes down to trusting express to start correctly.

The startup will later be tested via integration tests.

Author: chronark

jest.config.js

@@ -21,7 +21,7 @@ module.exports = {
   collectCoverage: true,
 
   // An array of glob patterns indicating a set of files for which coverage information should be collected
-  collectCoverageFrom: ["src/**/*.ts", "!src/**/*.d.ts"],
+  collectCoverageFrom: ["src/**/*.ts", "!src/**/*.d.ts", "!src/**/index.ts"],
 
   // The directory where Jest should output its coverage files
   coverageDirectory: "coverage",
@@ -33,9 +33,7 @@ module.exports = {
   },
 
   // An array of regexp pattern strings used to skip coverage collection
-  // coveragePathIgnorePatterns: [
-  //   "/node_modules/"
-  // ],
+  coveragePathIgnorePatterns: ["/node_modules/"],
 
   // A list of reporter names that Jest uses when writing coverage reports
   // coverageReporters: [