diff --git a/test/i18n.js b/test/i18n.js
new file mode 100644
index 0000000000..340d3d97eb
--- /dev/null
+++ b/test/i18n.js
@@ -0,0 +1,107 @@
+'use strict';
+
+// For tests relating to the translator module, check translator.js
+
+const assert = require('assert');
+const path = require('path');
+const fs = require('fs');
+
+const file = require('../src/file');
+
+const db = require('./mocks/databasemock');
+
+describe('i18n', () => {
+	let folders;
+
+	before(async () => {
+		folders = await fs.promises.readdir(path.resolve(__dirname, '../public/language'));
+		folders.shift();	// remove README.md from list of folders to check
+	});
+
+	it('should contain folders named after the language code', async () => {
+		const valid = /(?:README.md|^[a-z]{2}(?:-[A-Z]{2})?$|^[a-z]{2}(?:-x-[a-z]+)?$)/;	// good luck
+
+		folders.forEach((folder) => {
+			assert(valid.test(folder));
+		});
+	});
+
+	// There has to be a better way to generate tests asynchronously...
+	it('', async () => {
+		const sourcePath = path.resolve(__dirname, '../public/language/en-GB');
+		const fullPaths = await file.walk(sourcePath);
+		const sourceFiles = fullPaths.map(path => path.replace(sourcePath, ''));
+		const sourceStrings = new Map();
+
+		describe('source language file structure', () => {
+			it('should only contain valid JSON files', async () => {
+				try {
+					fullPaths.forEach((fullPath) => {
+						const hash = require(fullPath);
+						sourceStrings.set(fullPath.replace(sourcePath, ''), hash);
+					});
+				} catch (e) {
+					assert(!e, `Invalid JSON found: ${e.message}`);
+				}
+			});
+		});
+
+		folders.forEach((language) => {
+			describe(`"${language}" file structure`, () => {
+				let files;
+
+				before(async () => {
+					const translationPath = path.resolve(__dirname, `../public/language/${language}`);
+					files = (await file.walk(translationPath)).map(path => path.replace(translationPath, ''));
+				});
+
+				it('translations should contain every language file contained in the source language directory', () => {
+					sourceFiles.forEach((relativePath) => {
+						assert(files.includes(relativePath), `${relativePath.slice(1)} was found in source files but was not found in language "${language}" (likely not internationalized)`);
+					});
+				});
+
+				it('should not contain any extraneous files not included in the source language directory', () => {
+					files.forEach((relativePath) => {
+						assert(sourceFiles.includes(relativePath), `${relativePath.slice(1)} was found in language "${language}" but there is no source file for it (likely removed from en-GB)`);
+					});
+				});
+			});
+
+			describe(`"${language}" file contents`, () => {
+				let fullPaths;
+				const translationPath = path.resolve(__dirname, `../public/language/${language}`);
+				const strings = new Map();
+
+				before(async () => {
+					fullPaths = await file.walk(translationPath);
+				});
+
+				it('should contain only valid JSON files', () => {
+					try {
+						fullPaths.forEach((fullPath) => {
+							const hash = require(fullPath);
+							strings.set(fullPath.replace(translationPath, ''), hash);
+						});
+					} catch (e) {
+						assert(!e, `Invalid JSON found: ${e.message}`);
+					}
+				});
+
+				it('should contain every translation key contained in its source counterpart', () => {
+					const sourceArr = Array.from(sourceStrings.keys());
+					sourceArr.forEach((namespace) => {
+						const sourceKeys = Object.keys(sourceStrings.get(namespace));
+						const translationKeys = Object.keys(strings.get(namespace));
+
+						assert(sourceKeys && translationKeys);
+						sourceKeys.forEach((key) => {
+							assert(translationKeys.includes(key), `${namespace.slice(1, -5)}:${key} missing in ${language}`);
+						});
+						assert.strictEqual(sourceKeys.length, translationKeys.length, `Extra keys found in namespace ${namespace.slice(1, -5)} for language "${language}"`);
+					});
+				});
+			});
+		});
+	});
+});
diff --git a/test/translator.js b/test/translator.js
index c5479ed7e8..b8edb2d3b2 100644
--- a/test/translator.js
+++ b/test/translator.js
@@ -1,5 +1,6 @@
 'use strict';
 
+// For tests relating to Transifex configuration, check i18n.js
 
 const assert = require('assert');
 const shim = require('../public/src/modules/translator');