move the remaining RippleAPI tests to the new test runner

test/api/isValidSecret/index.ts

@@ -0,0 +1,12 @@
+import assert from 'assert-diff'
+import { TestSuite } from '../../utils'
+
+export default <TestSuite>{
+  'returns true for valid secret': async (api, address) => {
+    assert(api.isValidSecret('snsakdSrZSLkYpCXxfRkS4Sh96PMK'))
+  },
+
+  'returns false for invalid secret': async (api, address) => {
+    assert(!api.isValidSecret('foobar'))
+  }
+}