Add settings combination example

example/optional-settings-combination/createArray.js

@@ -0,0 +1,13 @@
+const createArray = function(gen, settings) {
+    /**
+     * Produces a array filled by calling gen
+     * settings can provide additonal parameters:
+     * - minimum_size: number
+     * - maximum_size: number
+     */
+    const minSize = settings != null && settings.minimum_size != null ? settings.minimum_size : 0;
+    const maxSize = settings != null && settings.minimum_size != null ? settings.maximum_size : minSize + 10;
+    return [...Array(minSize + Math.floor((maxSize - minSize +1) * Math.random()))].map(gen);
+};
+
+module.exports = { createArray };

example/optional-settings-combination/test.js

@@ -0,0 +1,20 @@
+const assert = require('assert');
+const fc = require('fast-check');
+const { createArray } = require('./createArray');
+
+describe('createArray', () => {
+    it('should always produce an array taking care of settings', () => fc.assert(
+        fc.property(
+            fc.record({
+                minimum_size: fc.nat(100),
+                maximum_size: fc.nat(100)
+            }),
+            (settings) => {
+                const out = createArray(() => 0, settings);
+                if (settings.minimum_size != null)
+                    assert.ok(out.length >= settings.minimum_size);
+                if (settings.maximum_size != null)
+                    assert.ok(out.length <= settings.maximum_size);
+            })
+    ));
+});

example/package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "test:contains": "mocha contains/test.js",
     "test:knight": "mocha shadows-of-the-knight-codingame/test.js",
+    "test:settings": "mocha optional-settings-combination/test.js",
     "test": "npm run test:contains && npm run test:knight"
   },
   "devDependencies": {

example/run.sh

@@ -5,7 +5,7 @@ npm install
 
 status=0
 
-for testUnit in "contains:6:0" "knight:15:1"
+for testUnit in "contains:6:0" "knight:15:1" "settings:0:1"
 do
     name=`echo "${testUnit}" | cut -d: -f1`
     success=`echo "${testUnit}" | cut -d: -f2`