fix(coverage): add unit tests for overload util

.travis.yml

@@ -14,8 +14,10 @@ before_script:
 script:
   - npm run ci
 after_success:
-  - if [ $TRAVIS_NODE_VERSION == '10' ]; then npm run release; fi
-  - npm run coverage
+  - if [ $TRAVIS_NODE_VERSION == '10' ]; then
+  -  npm run release
+  -  npm run coveralls
+  - fi
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/

package.json

@@ -22,7 +22,8 @@
     "ci": "run-s clean build test lint check-clean",
     "prerelease": "tsc -p src",
     "release": "semantic-release",
-    "coverage": "jest --runInBand --forceExit --detectOpenHandles --coverage --coverageReporters=text-lcov | coveralls"
+    "coverage": "npm run test -- --coverage",
+    "coveralls": "npm run coverage -- --coverageReporters=text-lcov | coveralls"
   },
   "repository": {
     "type": "git",
@@ -52,11 +53,6 @@
       "json"
     ]
   },
-  "nyc": {
-    "include": [
-      "src/*"
-    ]
-  },
   "prettier": {
     "tabWidth": 4
   },

scripts/overloads.ts

@@ -1,9 +1,11 @@
+/* istanbul ignore file */
 import { Argument } from "./command";
+import { get } from "lodash";
 
 export const getOverloads = (args: Argument[]): Argument[][] => {
     if (args.length <= 1) {
         const overloads = [args];
-        if (args[0] && args[0].optional) {
+        if (get(args, "[0].optional")) {
             overloads.push([]);
         }
         return overloads;

scripts/util.ts

@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { stringify as yamlify } from "yamljs";
 import { Command } from "./command";
 import { EOL } from "os";

test/overloads.test.ts

@@ -0,0 +1,23 @@
+import { getOverloads } from "../scripts/overloads";
+
+test("overloads for empty arguments", () => {
+    expect(getOverloads([])).toMatchInlineSnapshot(`
+        Array [
+          Array [],
+        ]
+    `);
+});
+
+test("overloads for non-empty arguments", () => {
+    expect(getOverloads([{ name: "foo", type: "string" }]))
+        .toMatchInlineSnapshot(`
+        Array [
+          Array [
+            Object {
+              "name": "foo",
+              "type": "string",
+            },
+          ],
+        ]
+    `);
+});