chore: migrate test cases from Chai to Jest

test/integration/liquid/operators-option.spec.ts

@@ -0,0 +1,33 @@
+import { Liquid, defaultOperators } from '../../../src'
+
+describe('LiquidOptions#operators', function () {
+  let engine: Liquid
+
+  beforeEach(function () {
+    engine = new Liquid({
+      operators: {
+        ...defaultOperators,
+        isFooBar: (l: string, r: string) => l === 'foo' && r === 'bar'
+      }
+    })
+  })
+
+  it('should evaluate the default operators', async function () {
+    const result = await engine.parseAndRender('{% if "foo" == "foo" %}True{% endif %}')
+    expect(result).toBe('True')
+  })
+
+  it('should evaluate a custom operator', async function () {
+    const first = await engine.parseAndRender('{% if "foo" isFooBar "bar" %}True{% else %}False{% endif %}')
+    expect(first).toBe('True')
+    const second = await engine.parseAndRender('{% if "foo" isFooBar "foo" %}True{% else %}False{% endif %}')
+    expect(second).toBe('False')
+  })
+
+  it('should evaluate a custom operator with the correct precedence', async function () {
+    const first = await engine.parseAndRender('{% if "foo" isFooBar "bar" or "foo" == "bar" %}True{% else %}False{% endif %}')
+    expect(first).toBe('True')
+    const second = await engine.parseAndRender('{% if "foo" isFooBar "foo" or "foo" == "bar" %}True{% else %}False{% endif %}')
+    expect(second).toBe('False')
+  })
+})