Chai assert Cheatsheet

Note that the assert object is not chainable. Link to assert docs.

• assert(expression, message)

• assert.fail(actual, expected, [message], [operator])

• assert.ok(object, [message])

  assert.notOk(object, [message])

• assert.equal(actual, expected, [message])

  assert.notEqual(actual, expected, [message])

• assert.strictEqual(actual, expected, [message])

  assert.notStrictEqual(actual, expected, [message])

• assert.deepEqual(actual, expected, [message])

  assert.notDeepEqual(actual, expected, [message])

• assert.isTrue(value, [message])

  assert.isFalse(value, [message])

• assert.isNull(value, [message])

  assert.isNotNull(value, [message])

• assert.isUndefined(value, [message])

  assert.isDefined(value, [message])

• assert.isFunction(value, [message])

  assert.isNotFunction(value, [message])

• assert.isObject(value, [message])

  assert.isNotObject(value, [message])

• assert.isArray(value, [message])

  assert.isNotArray(value, [message])

• assert.isString(value, [message])

  assert.isNotString(value, [message])

• assert.isNumber(value, [message])

  assert.isNotNumber(value, [message])

• assert.isBoolean(value, [message])

  assert.isNotBoolean(value, [message])

• assert.typeOf(value, name, [message])

  assert.notTypeOf(value, name, [message])

• assert.instanceOf(object, constructor, [message])

  assert.notInstanceOf(object, constructor, [message])

• assert.include(haystack, needle, [message])

  assert.notInclude(haystack, needle, [message])

• assert.match(value, regexp, [message])

  assert.notMatch(value, regexp, [message])

• assert.property(object, property, [message])

  assert.notProperty(object, property, [message])

• assert.deepProperty(object, property, [message])

  assert.notDeepProperty(object, property, [message])

• assert.propertyVal(object, property, value, [message])

  assert.propertyNotVal(object, property, value, [message])

• assert.deepPropertyVal(object, property, value, [message])

  assert.deepPropertyNotVal(object, property, value, [message])

• assert.lengthOf(object, length, [message])

• assert.throws(function, [constructor/string/regexp], [string/regexp], [message])

  assert.doesNotThrow(function, [constructor/regexp], [message])

• assert.operator(val1, operator, val2, [message])

• assert.closeTo(actual, expected, delta, [message])

• assert.sameMembers(set1, set2, [message])

• assert.includeMembers(superset, subset, [message])