feat(predicate): define a predicate for determining if mocha exists in a project

Author: travi

src/index.js

@@ -1,2 +1,3 @@
 export {default as scaffold} from './scaffolder.js';
+export {default as test} from './tester.js';
 export {default as remove} from './remover.js';

src/tester-test.js

@@ -0,0 +1,29 @@
+import {assert} from 'chai';
+
+import any from '@travi/any';
+import * as td from 'testdouble';
+
+suite('mocha predicate', () => {
+  let checkForMocha, core;
+  const projectRoot = any.string();
+
+  setup(async () => {
+    core = await td.replaceEsm('@form8ion/core');
+
+    ({default: checkForMocha} = (await import('./tester.js')));
+  });
+
+  teardown(() => td.reset());
+
+  test('that `false` is returned if no evidence of mocha is detected', async () => {
+    td.when(core.fileExists(`${projectRoot}/.mocharc.json`)).thenResolve(false);
+
+    assert.isFalse(await checkForMocha({projectRoot}));
+  });
+
+  test('that `true` is returned if the `.mocharc.json` file is found in the project', async () => {
+    td.when(core.fileExists(`${projectRoot}/.mocharc.json`)).thenResolve(true);
+
+    assert.isTrue(await checkForMocha({projectRoot}));
+  });
+});

src/tester.js

@@ -0,0 +1,5 @@
+import {fileExists} from '@form8ion/core';
+
+export default function ({projectRoot}) {
+  return fileExists(`${projectRoot}/.mocharc.json`);
+}