refactor: rewrite expression evaluation, fix #130

test/unit/render/boolean.ts

@@ -0,0 +1,38 @@
+import { isTruthy } from '../../../src/render/boolean'
+import { expect } from 'chai'
+
+describe('boolean', async function () {
+  describe('.isTruthy()', async function () {
+    // Spec: https://shopify.github.io/liquid/basics/truthy-and-falsy/
+    it('true is truthy', function () {
+      expect(isTruthy(true)).to.be.true
+    })
+    it('false is falsy', function () {
+      expect(isTruthy(false)).to.be.false
+    })
+    it('null is falsy', function () {
+      expect(isTruthy(null)).to.be.false
+    })
+    it('"foo" is truthy', function () {
+      expect(isTruthy('foo')).to.be.true
+    })
+    it('"" is truthy', function () {
+      expect(isTruthy('')).to.be.true
+    })
+    it('0 is truthy', function () {
+      expect(isTruthy(0)).to.be.true
+    })
+    it('1 is truthy', function () {
+      expect(isTruthy(1)).to.be.true
+    })
+    it('1.1 is truthy', function () {
+      expect(isTruthy(1.1)).to.be.true
+    })
+    it('[1] is truthy', function () {
+      expect(isTruthy([1])).to.be.true
+    })
+    it('[] is truthy', function () {
+      expect(isTruthy([])).to.be.true
+    })
+  })
+})