diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d570088
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..327c712
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,22 @@
+{
+  "name": "kuebiko",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "kuebiko",
+      "version": "1.0.0",
+      "license": "ISC",
+      "devDependencies": {
+        "folktest": "git+https://git.kitsu.cafe/rowan/folktest.git"
+      }
+    },
+    "node_modules/folktest": {
+      "version": "1.0.0",
+      "resolved": "git+https://git.kitsu.cafe/rowan/folktest.git#708d44f1215be33fcceba426029f44b4f963dbe5",
+      "dev": true,
+      "license": "GPL-3.0-or-later"
+    }
+  }
+}
diff --git a/package.json b/package.json
index 66457cd..6a17f30 100644
--- a/package.json
+++ b/package.json
@@ -5,9 +5,12 @@
   "main": "index.js",
   "author": "Rowan <rowan@kitsu.cafe> (https://kitsu.cafe)",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "./tests/index.js"
   },
   "keywords": [],
   "license": "ISC",
-  "description": ""
+  "description": "",
+  "devDependencies": {
+    "folktest": "git+https://git.kitsu.cafe/rowan/folktest.git"
+  }
 }
diff --git a/src/char.js b/src/char.js
index 504ce29..ef1dc34 100644
--- a/src/char.js
+++ b/src/char.js
@@ -12,14 +12,17 @@ export const char = curry(
    * @param {string} ch
    * @param {ParserState} state
    */
-  (ch, state) => (
-    next(state) === ch ? succeed(ch, state) : fail(`could not parse ${ch} `, state)
-  ))
+  //(ch, state) => (
+  //  next(state) === ch ? succeed(ch, state) : fail(`could not parse ${ch} `, state)
+  //))
+  (ch, state) => {
+    return next(state) === ch ? succeed(ch, state) : fail(`could not parse ${ch} `, state)
+  })
 
 export const str = curry(
   /**
    * @param {string} str
-   * @param {State} state
+   * @param {ParserState} state
    */
   (str, state) => (
     map(
diff --git a/src/cond.js b/src/cond.js
index 9d7b76b..8f3c629 100644
--- a/src/cond.js
+++ b/src/cond.js
@@ -1,7 +1,8 @@
 import { ParseError } from './state.js'
-import { fork, succeed } from './fn.js'
-import { curry } from '../vendor/izuna/src/index.js'
+import { fail, fork, succeed } from './fn.js'
 import { anyChar } from './char.js'
+import { ok } from '../vendor/kojima/src/index.js'
+import { curry } from '../vendor/izuna/src/index.js'
 
 /** @import { Result } from '../vendor/kojima/src/index.js' */
 /** @import { ParserState } from './state.js' */
@@ -19,6 +20,7 @@ export const maybe = curry(
 
 export const not = parser => state => {
   const result = parser(state)
+
   if (result.isOk()) {
     return fail('"not" parser failed', state)
   } else {
@@ -27,19 +29,19 @@ export const not = parser => state => {
 }
 
 export const until = parser => state => {
-  let acc = ok(state)
+  let result = ok(state)
 
   while (result.isOk()) {
     const [original, clone] = fork(state)
-    const result = acc.chain(x => parser(clone))
+    result = result.chain(x => parser(clone))
     if (result.isOk()) {
       break
     } else {
-      acc = anyChar(original)
+      result = anyChar(original)
     }
   }
 
-  return acc
+  return result
 }
 
 export const many = curry((parser, state) => {
diff --git a/src/fn.js b/src/fn.js
index 9603067..417c986 100644
--- a/src/fn.js
+++ b/src/fn.js
@@ -97,3 +97,4 @@ export const mapStr = curry(
   (fn, str) => Array.from(str).map(v => fn(v))
 )
 
+
diff --git a/src/index.js b/src/index.js
index 0c0c84a..a797e01 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,7 +4,3 @@ export * from './cond.js'
 export * from './seq.js'
 export * from './state.js'
 
-console.log(
-  parse(until(not(char('!'))), '!!!!!!!a!!!!')
-)
-
diff --git a/src/iter.js b/src/iter.js
index 25e5e05..ce6aa7e 100644
--- a/src/iter.js
+++ b/src/iter.js
@@ -19,8 +19,7 @@ export class Iter {
    * @returns {value is Iterable<T>}
    */
   static _isIterable(value) {
-    return Object.hasOwn(value, Symbol.iterator)
-      && typeof value[Symbol.iterator] === 'function'
+    return typeof value[Symbol.iterator] === 'function'
   }
 
   /**
@@ -49,7 +48,8 @@ export class Iter {
    * @param {any} [value]
    */
   next(value) {
-    return this._iterator.next(value)
+    const n = this._iterator.next(value)
+    return n
   }
 
   /**
diff --git a/src/seq.js b/src/seq.js
index de71fbe..16245ce 100644
--- a/src/seq.js
+++ b/src/seq.js
@@ -40,10 +40,9 @@ export const seq = (...parsers) =>
   /** @param {ParserState} state */
   state => {
     let acc = ok(state)
-
     for (const parser of parsers) {
       if (acc.isOk()) {
-        acc = acc.bind(parser)
+        acc = acc.chain(parser)
       } else {
         break
       }
@@ -59,16 +58,12 @@ export const map = curry(
    * @param {ParserState} state
    */
   (fn, parser, state) => {
-    return parser(state).map(result => {
+    return parser(state).chain(result => {
       try {
         /** @type {Result<ParserState, ParseError>} */
-        const parsed = result.chain(otherState =>
-          fn(diff(state[0], otherState[0]))
-        )
+        const parsed = fn(diff(state[0], result[0]))
+        const backtrack = Tuple(state[0], result[1])
 
-        const backtrack = result.chain(otherState =>
-          Tuple(state[0], otherState[1])
-        )
 
         return succeed(parsed, backtrack)
       } catch (e) {
diff --git a/tests/index.js b/tests/index.js
new file mode 100755
index 0000000..d9b03db
--- /dev/null
+++ b/tests/index.js
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+
+import { TerminalRunner } from 'folktest'
+import * as Tests from './units/index.js'
+
+console.log(TerminalRunner(Tests).toString())
+
diff --git a/tests/units/index.js b/tests/units/index.js
new file mode 100644
index 0000000..bf8ff42
--- /dev/null
+++ b/tests/units/index.js
@@ -0,0 +1,11 @@
+import { it, assert } from 'folktest'
+import { map, not, until, char, parse, State, seq, str } from '../../src/index.js'
+import { mapStr, join } from '../../src/fn.js'
+
+export const Tests = [
+  it('whatever', () => {
+    const a = 'abcdef!!!!'.split('')
+    parse(str('abc'), 'abc').map(console.log)
+  })
+]
+