From 209266dbed9d7d038c90c2da8d9b99acab77c80c Mon Sep 17 00:00:00 2001
From: Fabio Berger <me@fabioberger.com>
Date: Wed, 9 May 2018 20:36:28 +0200
Subject: Split 0x.js into contract-wrappers, order-watcher but keep 0x.js as a
 unifying library with the same interface

---
 packages/dev-utils/src/callback_error_reporter.ts | 66 +++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 packages/dev-utils/src/callback_error_reporter.ts

(limited to 'packages/dev-utils/src/callback_error_reporter.ts')

diff --git a/packages/dev-utils/src/callback_error_reporter.ts b/packages/dev-utils/src/callback_error_reporter.ts
new file mode 100644
index 000000000..874343ccc
--- /dev/null
+++ b/packages/dev-utils/src/callback_error_reporter.ts
@@ -0,0 +1,66 @@
+import * as chai from 'chai';
+import * as _ from 'lodash';
+
+import { DoneCallback } from '@0xproject/types';
+
+const expect = chai.expect;
+
+export const callbackErrorReporter = {
+    reportNoErrorCallbackErrors(done: DoneCallback, expectToBeCalledOnce = true) {
+        return <T>(f?: (value: T) => void) => {
+            const wrapped = (value: T) => {
+                if (_.isUndefined(f)) {
+                    done();
+                    return;
+                }
+                try {
+                    f(value);
+                    if (expectToBeCalledOnce) {
+                        done();
+                    }
+                } catch (err) {
+                    done(err);
+                }
+            };
+            return wrapped;
+        };
+    },
+    reportNodeCallbackErrors(done: DoneCallback, expectToBeCalledOnce = true) {
+        return <T>(f?: (value: T) => void) => {
+            const wrapped = (error: Error | null, value: T | undefined) => {
+                if (!_.isNull(error)) {
+                    done(error);
+                } else {
+                    if (_.isUndefined(f)) {
+                        done();
+                        return;
+                    }
+                    try {
+                        f(value as T);
+                        if (expectToBeCalledOnce) {
+                            done();
+                        }
+                    } catch (err) {
+                        done(err);
+                    }
+                }
+            };
+            return wrapped;
+        };
+    },
+    assertNodeCallbackError(done: DoneCallback, errMsg: string) {
+        const wrapped = <T>(error: Error | null, value: T | undefined) => {
+            if (_.isNull(error)) {
+                done(new Error('Expected callback to receive an error'));
+            } else {
+                try {
+                    expect(error.message).to.be.equal(errMsg);
+                    done();
+                } catch (err) {
+                    done(err);
+                }
+            }
+        };
+        return wrapped;
+    },
+};
-- 
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