1 files changed, 75 insertions, 0 deletions
diff --git a/test/webidl/helpers.js b/test/webidl/helpers.js
new file mode 100644
index 0000000..f44d501
--- /dev/null
+++ b/test/webidl/helpers.js
@@ -0,0 +1,75 @@
+'use strict'
+
+const { test } = require('tap')
+const { webidl } = require('../../lib/fetch/webidl')
+
+test('webidl.interfaceConverter', (t) => {
+  class A {}
+  class B {}
+
+  const converter = webidl.interfaceConverter(A)
+
+  t.throws(() => {
+    converter(new B())
+  }, TypeError)
+
+  t.doesNotThrow(() => {
+    converter(new A())
+  })
+
+  t.end()
+})
+
+test('webidl.dictionaryConverter', (t) => {
+  t.test('extraneous keys are provided', (t) => {
+    const converter = webidl.dictionaryConverter([
+      {
+        key: 'key',
+        converter: webidl.converters.USVString,
+        defaultValue: 420,
+        required: true
+      }
+    ])
+
+    t.same(
+      converter({
+        a: 'b',
+        key: 'string',
+        c: 'd',
+        get value () {
+          return 6
+        }
+      }),
+      { key: 'string' }
+    )
+
+    t.end()
+  })
+
+  t.test('defaultValue with key = null', (t) => {
+    const converter = webidl.dictionaryConverter([
+      {
+        key: 'key',
+        converter: webidl.converters['unsigned short'],
+        defaultValue: 200
+      }
+    ])
+
+    t.same(converter({ key: null }), { key: 0 })
+    t.end()
+  })
+
+  t.test('no defaultValue and optional', (t) => {
+    const converter = webidl.dictionaryConverter([
+      {
+        key: 'key',
+        converter: webidl.converters.ByteString
+      }
+    ])
+
+    t.same(converter({ a: 'b', c: 'd' }), {})
+    t.end()
+  })
+
+  t.end()
+})