Replace generator-exercise with plop generator

generators/writeExerciseSpec.js

@@ -0,0 +1,34 @@
+const { writeFile } = require("fs/promises");
+const { join } = require("path");
+const { splitDirectoryName } = require("./helpers");
+
+async function writeExerciseSpec(exercisePath) {
+  const { exerciseName } = splitDirectoryName(exercisePath);
+  const isSolutionFile = exercisePath.includes("/solution");
+  const trueExerciseName = isSolutionFile
+    ? `${exerciseName}-solution`
+    : exerciseName;
+
+  const exerciseSpecContent = `const ${exerciseName} = require('./${trueExerciseName}');
+
+describe('${exerciseName}', () => {
+  test('First test description', () => {
+    // Replace this comment with any other necessary code, and update the expect line as necessary
+
+    expect(${exerciseName}()).toBe('');
+  });
+  
+  test${isSolutionFile ? "" : ".skip"}('Second test description', () => {
+    // Replace this comment with any other necessary code, and update the expect line as necessary
+
+    expect(${exerciseName}()).toBe('');
+  });
+});`;
+
+  await writeFile(
+    join(exercisePath, `${trueExerciseName}.spec.js`),
+    exerciseSpecContent
+  );
+}
+
+module.exports = { writeExerciseSpec };