fix(#26): refactor the checking if directory exists and raising warning

into a separate function and write unit tests for it

src/fn/csv-to-docs.js

@@ -30,13 +30,9 @@ const execute = () => {
   const jsonDir = `${environment.pathToProject}/json_docs`;
   fs.mkdir(jsonDir);
 
-  if (!fs.isDirectoryEmpty(jsonDir)) {
-    warn(`There are already docs in ${jsonDir}.
-     New json files will be created along side these existing docs.`);
-    if (!userPrompt.keyInYN('Are you sure you want to continue?')) {
-      throw new Error('User aborted execution.');
-    }
-  }
+  const warningMsg = `There are already docs in ${jsonDir}.
+     New json files will be created along side these existing docs.`;
+  warnIfDirectoryIsNotEmpty(jsonDir, warningMsg);
 
   const saveJsonDoc = doc => fs.write(`${jsonDir}/${doc._id}.doc.json`, safeStringify(doc) + '\n');
 
@@ -159,6 +155,16 @@ const execute = () => {
   }
 };
 
+function warnIfDirectoryIsNotEmpty(dir, warningMsg) {
+  if (!fs.isDirectoryEmpty(dir)) {
+    warn(warningMsg);
+
+    if (!userPrompt.keyInYN('Are you sure you want to continue?')) {
+      throw new Error('User aborted execution.');
+    }
+  }
+}
+
 function setCol(doc, col, val) {
   const colParts = col.split('.');
 
@@ -271,5 +277,6 @@ module.exports = {
   int,
   setCol,
   parseColumn,
-  removeExcludedField
+  removeExcludedField,
+  warnIfDirectoryIsNotEmpty,
 };

test/fn/csv-to-docs.spec.js

@@ -1,9 +1,11 @@
-const { assert } = require('chai');
+const { expect } = require('chai');
 const sinon = require('sinon');
 
 const csvToDocs = require('../../src/fn/csv-to-docs');
 const environment = require('../../src/lib/environment');
 const fs = require('../../src/lib/sync-fs');
+const userPrompt = require('../../src/lib/user-prompt');
+const { warn } = require('../../src/lib/log');
 
 let clock;
 
@@ -36,7 +38,7 @@ describe('csv-to-docs', function() {
             const expectedDocsDir  = `${dir}/expected-json_docs`;
 
             // then
-            assert.equal(countFilesInDir(generatedDocsDir),
+            expect(countFilesInDir(generatedDocsDir)).to.equal(
                          countFilesInDir(expectedDocsDir ),
                          `Different number of files in ${generatedDocsDir} and ${expectedDocsDir}.`);
 
@@ -47,7 +49,7 @@ describe('csv-to-docs', function() {
                 const generated = fs.read(`${generatedDocsDir}/${file}`);
 
                 // and
-                assert.equal(generated, expected, `Different contents for "${file}"`);
+                expect(generated).to.equal(expected, `Different contents for "${file}"`);
               });
           })
           .then(done)
@@ -57,6 +59,53 @@ describe('csv-to-docs', function() {
 
   });
 
+  describe('#warnIfDirectoryIsNotEmpty()', () => {
+    afterEach(() => {
+      sinon.restore();
+    });
+
+    const warnSpy = sinon.spy(warn);
+
+    // Test case 1: Directory is empty, no warning should be triggered
+    it('should not trigger warning if directory is empty', () => {
+      const dir = 'emptyDirectory';
+      const warningMsg = 'This is a warning message';
+      sinon.stub(fs, 'isDirectoryEmpty').returns(true);
+      sinon.stub(userPrompt, 'keyInYN').returns(true);
+
+      csvToDocs.warnIfDirectoryIsNotEmpty(dir, warningMsg);
+
+      expect(userPrompt.keyInYN.called).to.be.false;
+    });
+
+    // Test case 2: Directory is not empty, warning and user prompt should be triggered
+    it('should trigger warning and user prompt if directory is not empty', () => {
+      const dir = 'nonEmptyDirectory';
+      const warningMsg = 'This is a warning message';
+
+      sinon.stub(fs, 'isDirectoryEmpty').returns(false);
+      sinon.stub(userPrompt, 'keyInYN').returns(true);
+
+      expect(() => csvToDocs.warnIfDirectoryIsNotEmpty(dir, warningMsg)).to.not.throw();
+
+      expect(warnSpy.calledWith(warningMsg));
+      expect(userPrompt.keyInYN.calledWith('Are you sure you want to continue?')).to.be.true;
+    });
+
+    // Test case 3: User chooses not to continue, an error should be thrown
+    it('should throw an error if user chooses not to continue', () => {
+      const dir = 'nonEmptyDirectory';
+      const warningMsg = 'This is a warning message';
+
+      sinon.stub(fs, 'isDirectoryEmpty').returns(false);
+      sinon.stub(userPrompt, 'keyInYN').returns(false);
+
+      expect(() => csvToDocs.warnIfDirectoryIsNotEmpty(dir, warningMsg)).to.throw('User aborted execution.');
+
+      expect(warnSpy.calledWith(warningMsg));
+      expect(userPrompt.keyInYN.calledWith('Are you sure you want to continue?')).to.be.true;
+    });
+  });
 });
 
 const countFilesInDir = path => fs.fs.readdirSync(path).length;

test/lib/sync-fs.spec.js

@@ -1,5 +1,3 @@
-const assert = require('chai').assert;
-
 const chai = require('chai');
 const fs = require('../../src/lib/sync-fs');
 // NOTE: be careful with the names, this one is the original fs module
@@ -19,7 +17,7 @@ describe('sync-fs', () => {
     ].forEach(([input, expected]) => {
 
       it(`should convert ${input} to ${expected}`, () => {
-        assert.equal(fs.withoutExtension(input), expected);
+        expect(fs.withoutExtension(input), expected);
       });
     });
   });