eslint-module-utils: Add tests for hash utils

tests/src/core/hash.js

@@ -0,0 +1,76 @@
+import { expect } from 'chai'
+
+import hashify, { hashArray, hashObject } from 'eslint-module-utils/hash'
+
+const createHash = require('crypto').createHash
+
+function expectHash(actualHash, expectedString) {
+  const expectedHash = createHash('sha256')
+  expectedHash.update(expectedString)
+  expect(actualHash.digest('hex'), 'to be a hex digest of sha256 hash of string <' + expectedString + '>').to.equal(expectedHash.digest('hex'))
+}
+
+describe('hash', function () {
+  describe('hashify', function () {
+    it('handles null', function () {
+      expectHash(hashify(null), 'null')
+    })
+
+    it('handles undefined', function () {
+      expectHash(hashify(undefined), 'undefined')
+    })
+
+    it('handles numbers', function () {
+      expectHash(hashify(123.456), '123.456')
+    })
+
+    it('handles strings', function () {
+      expectHash(hashify('a string'), '"a string"')
+    })
+
+    it('handles Array instances', function () {
+      expectHash(hashify([ 'a string' ]), '["a string",]')
+    })
+
+    it('handles empty Array instances', function () {
+      expectHash(hashify([]), '[]')
+    })
+
+    it('handles Object instances', function () {
+      expectHash(hashify({ foo: 123.456, 'a key': 'a value' }), '{"a key":"a value","foo":123.456,}')
+    })
+
+    it('handles nested Object instances', function () {
+      expectHash(hashify({ foo: 123.456, 'a key': 'a value', obj: { abc: { def: 'ghi' } } }), '{"a key":"a value","foo":123.456,"obj":{"abc":{"def":"ghi",},},}')
+    })
+
+    it('handles nested Object and Array instances', function () {
+      expectHash(hashify({ foo: 123.456, 'a key': 'a value', obj: { arr: [ { def: 'ghi' } ] } }), '{"a key":"a value","foo":123.456,"obj":{"arr":[{"def":"ghi",},],},}')
+    })
+  })
+
+  describe('hashArray', function () {
+    it('handles Array instances', function () {
+      expectHash(hashArray([ 'a string' ]), '["a string",]')
+    })
+
+    it('handles empty Array instances', function () {
+      expectHash(hashArray([]), '[]')
+    })
+  })
+
+  describe('hashObject', function () {
+    it('handles Object instances', function () {
+      expectHash(hashObject({ foo: 123.456, 'a key': 'a value' }), '{"a key":"a value","foo":123.456,}')
+    })
+
+    it('handles nested Object instances', function () {
+      expectHash(hashObject({ foo: 123.456, 'a key': 'a value', obj: { abc: { def: 'ghi' } } }), '{"a key":"a value","foo":123.456,"obj":{"abc":{"def":"ghi",},},}')
+    })
+
+    it('handles nested Object and Array instances', function () {
+      expectHash(hashObject({ foo: 123.456, 'a key': 'a value', obj: { arr: [ { def: 'ghi' } ] } }), '{"a key":"a value","foo":123.456,"obj":{"arr":[{"def":"ghi",},],},}')
+    })
+  })
+
+})