refactor: rename all test files to camelCase (#1562)

* rename files to camelCase

* fix imports

* more renames

* pull all client tests out of individual folders

* fix imports

* fix tests

test/client/errors.ts

@@ -0,0 +1,19 @@
+import assert from 'assert-diff'
+import {TestSuite} from '../testUtils'
+
+/**
+ * Every test suite exports their tests in the default object.
+ * - Check out the "TestSuite" type for documentation on the interface.
+ * - Check out "test/client/index.ts" for more information about the test runner.
+ */
+export default <TestSuite>{
+  'RippleError with data': async (client, address) => {
+    const error = new client.errors.RippleError('_message_', '_data_')
+    assert.strictEqual(error.toString(), "[RippleError(_message_, '_data_')]")
+  },
+
+  'NotFoundError default message': async (client, address) => {
+    const error = new client.errors.NotFoundError()
+    assert.strictEqual(error.toString(), '[NotFoundError(Not found)]')
+  }
+}