Lambda Behave Framework overview

A modern testing and behavioural specification framework for Java 8
23 August 2017   881

Framework's goal is to make testing a more pleasant experience than it currently is.

One of the goals of the framework is to achieve great readability. The syntax encourages to describe test cases using full sentences rather just a few words.


The Lambda Behave Specification design has several goals:

  • To read like plain English.
  • To encourage describing tests using long and descriptive sentences, rather than a few words.
  • An API that is fluent and discoverable nearly entirely through IDE auto-completion.

There are many, many, expectations builtin to the framework - not just isEmpty().

Every specification suite starts its declaration using the Suite.describe method. From that point onwards your IDE should be able to auto-complete the domain specific language for declaring specifications, but just in case you want more information, here's the details.

  • If you want to specify a property about your system use it.should.
  • If you want describe an expectation of that property, use expect.that. This will get you to a fluent API restricted to the type of value that you're making the expectation about. The expectation system is based upon hamcrest. Lambda Behave doesn't compromise the ability to compose matchers in favour of fluency - if you want to compose in more complex flavours simply use expect.that(value).is() and then you can use regular Hamcrest matchers. In my experience this is a rare, albeit useful, breakout option.
  • If you want to setup or teardown data before or after each specification use it.isSetupWith and it.isConcludedWith.
  • If you want to setup or teardown data before or after each suite use it.initializesWith and it.completesWith.
  • Don't worry - I know some Java 8 lambdafied APIs don't deal with exceptions very well but you can throw exceptions in all our callbacks and the appropriate error will be reported, not just break the library.

More info available at GitHub

Canonical to Represent Minimal Ubuntu

New version of Ubuntu is created for servers, isolated containers based on Docker and cloud systems
12 July 2018   105

Ubuntu team presented a simplified version of the base image - Minimal Ubuntu. It is designed for servers, isolated containers based on Docker and cloud systems. The release features high performance, minimal load time and automation of applications in the cloud.

The small footprint of Minimal Ubuntu, when deployed with fast VM provisioning from GCE, helps deliver drastically improved boot times, making them a great choice for developers looking to build their applications on Google Cloud Platform.

Paul Nash

Group Product Manager, Google Cloud

The authors of the project emphasize the size of the distribution kit, which "weighs" 157 MB, and also supports the main cloud systems like Amazon EC2, Google Compute Engine (GCE), LXD and KVM / OpenStack, each of which has its own optimized version of the package. In addition, the OS-based image for operating with containers based on the Docker platform, compatible with the Kubernetes.

Minimal Ubuntu is designed for automated execution, so it includes only a minimal set of tools. The distribution can be upgraded to a set of Ubuntu Server packages using the special utility "unminimize", which returns components that are convenient for interactive management.

According to Canonical representatives, the deletion of the manual control functions resulted in the acceleration of the load time by 40% and the reduction of the occupied disk space by 50%. At the same time, this release remained completely compatible with all the packages from standard Ubuntu repositories. Required packages can be installed using the standard package manager apt or using snapd, which are included in the distribution by default.

Two assemblies are available for download, based on Ubuntu 16.04 LTS and 18.04 LTS. You can download them on the official website.