diff --git a/wiktionary_pron/scripts/tests/get_ipa.test.js b/wiktionary_pron/scripts/tests/get_ipa.test.js
new file mode 100644
index 0000000..4ac2371
--- /dev/null
+++ b/wiktionary_pron/scripts/tests/get_ipa.test.js
@@ -0,0 +1,162 @@
+import { get_ipa_no_cache } from "../utils.js";
+import assert from "node:assert";
+
+async function loadLanguage(code) {
+  const lua = global.window.lua;
+  await lua.doString(`${code} = require("${code}-pron_wasm")`);
+  // Get a global lua function as a JS function
+  global["window"][code + "_ipa"] = lua.global.get(code);
+
+  // Set a JS function to be a global lua function
+}
+
+console.log = function () {};
+
+describe("get_ipa_no_cache", function () {
+  function testCases(tests) {
+    tests.forEach(({ text, args, expected }) => {
+      it(` ${text} should return ${expected} for ${args}`, function () {
+        const res = get_ipa_no_cache(text, args).value;
+        assert.strictEqual(res, expected);
+      });
+    });
+  }
+
+  before(async function () {
+    await (await import("./init.js")).default();
+  });
+  describe("German", function () {
+    before(async function () {
+      await loadLanguage("de");
+    });
+    const tests = [
+      {
+        text: "aufeinanderzupassende",
+        args: "German;Default;Phonemic",
+        expected: "aʊ̯f(ʔ)aɪ̯ˈnandɐt͡suˌpasəndə",
+      },
+      {
+        text: "aufeinanderzupassende",
+        args: "German;Default;Phonetic",
+        expected: "ʔaʊ̯f(ʔ)aɪ̯ˈnan.dɐt͡sʰuˌpʰa.sn̩.də",
+      },
+    ];
+
+    testCases(tests);
+  });
+
+  describe("Latin", function () {
+    before(async function () {
+      await loadLanguage("la");
+    });
+    const tests = [
+      {
+        text: "provinciarum",
+        args: "Latin;Ecc;Phonemic",
+        expected: "pro.vinˈt͡ʃi.a.rum",
+      },
+      {
+        text: "provinciarum",
+        args: "Latin;Ecc;Phonetic",
+        expected: "provin̠ʲˈt͡ʃiːärum",
+      },
+      {
+        text: "provinciarum",
+        args: "Latin;Classical;Phonemic",
+        expected: "pro.u̯inˈki.a.rum",
+      },
+      {
+        text: "provinciarum",
+        args: "Latin;Classical;Phonetic",
+        expected: "prou̯ɪŋˈkiärʊ̃ˑ",
+      },
+    ];
+    testCases(tests);
+  });
+
+  describe("Spanish", function () {
+    before(async function () {
+      await loadLanguage("es");
+    });
+    const tests = [
+      {
+        text: "accidental",
+        args: "Spanish;Latin_American;Phonetic",
+        expected: "aɣ̞.si.ð̞ẽn̪ˈt̪al",
+      },
+      {
+        text: "accidental",
+        args: "Spanish;Castilian;Phonetic",
+        expected: "aɣ̞.θi.ð̞ẽn̪ˈt̪al",
+      },
+      {
+        text: "susceptible",
+        args: "Spanish;Castilian;Phonetic",
+        expected: "sus.θeβ̞ˈt̪i.β̞le",
+      },
+      {
+        text: "susceptible",
+        args: "Spanish;Latin_American;Phonetic",
+        expected: "su.seβ̞ˈt̪i.β̞le",
+      },
+    ];
+    testCases(tests);
+  });
+
+  describe("French", function () {
+    before(async function () {
+      await loadLanguage("fr");
+    });
+    const tests = [
+      {
+        text: "troisièmement",
+        args: "French;Default;Phonemic",
+        expected: "tʁwa.zjɛm.mɑ̃",
+      },
+      {
+        text: "exponentiel",
+        args: "French;Default;Phonemic",
+        expected: "ɛk.spɔ.nɑ̃.sjɛl",
+      },
+    ];
+    testCases(tests);
+  });
+
+  describe("Polish", function () {
+    before(async function () {
+      await loadLanguage("pl");
+    });
+    const tests = [
+      {
+        text: "zewnętrzny",
+        args: "Polish;Default;Phonemic",
+        expected: "zɛvˈnɛn.tʂnɨ",
+      },
+      {
+        text: "grałybyśmy",
+        args: "Polish;Default;Phonemic",
+        expected: "ˈɡra.wɨ.bɨɕ.mɨ",
+      },
+    ];
+    testCases(tests);
+  });
+
+  describe("Ancient Greek", function () {
+    before(async function () {
+      await loadLanguage("grc");
+    });
+    const tests = [
+      {
+        text: "ἀρχιμανδρῑ́της",
+        args: "Greek;15th CE Constantinopolitan;Phonetic",
+        expected: "ar.çi.manˈdri.tis",
+      },
+      {
+        text: "κέλευσμα",
+        args: "Greek;15th CE Constantinopolitan;Phonetic",
+        expected: "ˈce.levz.ma",
+      },
+    ];
+    testCases(tests);
+  });
+});
diff --git a/wiktionary_pron/scripts/tests/test_get_ipa.js b/wiktionary_pron/scripts/tests/test_get_ipa.js
deleted file mode 100644
index 61c0d6b..0000000
--- a/wiktionary_pron/scripts/tests/test_get_ipa.js
+++ /dev/null
@@ -1,84 +0,0 @@
-import { get_ipa_no_cache } from "../utils.js";
-import assert from "node:assert";
-
-async function loadLanguage(code) {
-  const lua = global.window.lua;
-  await lua.doString(`${code} = require("${code}-pron_wasm")`);
-  // Get a global lua function as a JS function
-  global["window"][code + "_ipa"] = lua.global.get(code);
-
-  // Set a JS function to be a global lua function
-}
-
-console.log = function () {};
-
-async function testLanguage(language_code, cases) {
-  await loadLanguage(language_code);
-
-  cases.map(function (c) {
-    console.warn(
-      c.text,
-      c.args,
-      c.expected,
-      get_ipa_no_cache(c.text, c.args).value,
-    );
-    if (c.expected != get_ipa_no_cache(c.text, c.args).value) {
-      console.warn(
-        "FAIL",
-        c.text,
-        c.args,
-        c.expected,
-        get_ipa_no_cache(c.text, c.args).value,
-      );
-    }
-  });
-}
-
-(async function testRunner() {
-  await (await import("./init.js")).default();
-
-  const cases_la = [
-    {
-      text: "provinciarum",
-      args: "Latin;Ecc;Phonemic",
-      expected: "pro.vinˈt͡ʃi.a.rum",
-      lang_code: "la",
-    },
-    {
-      text: "provinciarum",
-      args: "Latin;Ecc;Phonetic",
-      expected: "provin̠ʲˈt͡ʃiːärum",
-      lang_code: "la",
-    },
-    {
-      text: "provinciarum",
-      args: "Latin;Classical;Phonemic",
-      expected: "pro.u̯inˈki.a.rum",
-      lang_code: "la",
-    },
-    {
-      text: "provinciarum",
-      args: "Latin;Classical;Phonetic",
-      expected: "prou̯ɪŋˈkiärʊ̃ˑ",
-      lang_code: "la",
-    },
-  ];
-  await testLanguage("la", cases_la);
-
-  const cases_de = [
-    {
-      text: "aufeinanderzupassende",
-      args: "German;Default;Phonemic",
-      expected: "aʊ̯f(ʔ)aɪ̯ˈnandɐt͡suˌpasəndə",
-      lang_code: "de",
-    },
-    {
-      text: "aufeinanderzupassende",
-      args: "German;Default;Phonetic",
-      expected: "ʔaʊ̯f(ʔ)aɪ̯ˈnan.dɐt͡sʰuˌpʰa.sn̩.də",
-      lang_code: "de",
-    },
-  ];
-
-  await testLanguage("de", cases_de);
-})();