feat: promise support for drops, working on #65

test/integration/drop/drop.ts

@@ -8,7 +8,7 @@ describe('drop/drop', function () {
   class CustomDrop extends Liquid.Types.Drop {
     name: string = 'NAME'
     getName () {
-      return 'GETNAME'
+      return 'GET NAME'
     }
   }
   class CustomDropWithMethodMissing extends CustomDrop {
@@ -16,9 +16,18 @@ describe('drop/drop', function () {
       return key.toUpperCase()
     }
   }
+  class PromiseDrop extends Liquid.Types.Drop {
+    name = Promise.resolve('NAME')
+    async getName () {
+      return 'GET NAME'
+    }
+    async liquidMethodMissing (key: string) {
+      return key.toUpperCase()
+    }
+  }
   it('should call corresponding method', async function () {
     const html = await liquid.parseAndRender(`{{obj.getName}}`, { obj: new CustomDrop() })
-    expect(html).to.equal('GETNAME')
+    expect(html).to.equal('GET NAME')
   })
   it('should read corresponding property', async function () {
     const html = await liquid.parseAndRender(`{{obj.name}}`, { obj: new CustomDrop() })
@@ -32,4 +41,16 @@ describe('drop/drop', function () {
     const html = await liquid.parseAndRender(`{{obj.foo}}`, { obj: new CustomDropWithMethodMissing() })
     expect(html).to.equal('FOO')
   })
+  it('should call corresponding promise method', async function () {
+    const html = await liquid.parseAndRender(`{{obj.getName}}`, { obj: new PromiseDrop() })
+    expect(html).to.equal('GET NAME')
+  })
+  it('should read corresponding promise property', async function () {
+    const html = await liquid.parseAndRender(`{{obj.name}}`, { obj: new PromiseDrop() })
+    expect(html).to.equal('NAME')
+  })
+  it('should support promise returned by liquidMethodMissing', async function () {
+    const html = await liquid.parseAndRender(`{{obj.foo}}`, { obj: new PromiseDrop() })
+    expect(html).to.equal('FOO')
+  })
 })