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Upgrading a Rails app to Cucumber 3

Upgrade gems

You need to update a lof gems. Make sure you don't have any version constraints in your Gemfile or your bundle update won't do anything!

Upgrade cucumber_priority:

bundle update cucumber_priority

Upgrade spreewald:

bundle update spreewald

Upgrade cucumber_factory:

bundle update cucumber_factory

Upgrade parallel_tests:

bundle update parallel_tests

Even on the latest version, parallel_tests will print some deprecation warnings due to using an older formatter A…

Chrome: Making high-resolution website screenshots without add-ons

If you want to make a screenshot of a website that works well in print or on a high-DPI screen (like Apple Retina displays), here is how you can capture a high-resolution screenshot.

You can do this without an addon:

  • Open the website
  • If you have multiple monitoros:
    • Resize the Chrome window so it covers multiple monitors (in Linux you can hold ALT and resize by dragging with the right mouse button)
    • Zoom into the page using CTRL + and CTRL - so it covers most of the window area. Leave generous padding on the left and right so…

Form letters with LibreOffice Writer

This is painful. Consider using Microsoft Office or switching careers. If you need to write < 20 letters consider doing it manually.

So you didn't listen and here it comes:

  1. Ignore the Mail Merge Wizard. It will crash or destroy your document.
  2. Export your addresses, recipient names, etc. as a .ods spreadsheet (.xls, .xlsx, .ods). Use any columns that work for you, but be consistent. I like to use one column for the address, one column for the salutation line.
  3. Import the spreadsheet as an address book source: *Tools => Add…

How to fix HTML elements being cut off when printing

When you print (or print preview) and elements are cut off (e.g. after 1st page, or "randomly") you should check your CSS rules for these:

  • Is there an element with "display: inline-block" that surrounds your content? Make sure it has "display: block" for printing.
    This primarily affects Firefox and Internet Explorer. Chrome seems to be able to handle inline-block elements in most cases.

  • Does the element itself, or a container, define "overflow: hidden"? Use "overflow: auto" (or maybe "overflow: visible") instead.

  • Is th…

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Cucumber: Identifying slow steps that drag down your test speed

In most projects I know, Cucumber test suite speed is not an issue. Of course, running 350 features takes its time, but still each test for itself is reasonably fast. There is nothing you can do to fundamentally speed up such a test (of course, you should be using parallel_tests).

However, in projects that go beyond clicking around in a web GUI and checking results, there might be various measures to speed things up. Katapult tests for example could be sped up more than 4 times by re…

Repeats

Async control flow in JavaScript: Promises, Microtasks, async/await

Slides for Henning's talk on Sep 21st 2017.


Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

print('script start')
html = http_get('/foo')
print(html)
print('script end')

Script outputs 'script start', (long delay), '<html>...</html>', 'script end'.

Talking to asynchronous (or "evented") API

print('script start')
http_get('foo', done: function(html) {
  print(html)
}
print('script end')

Script outputs `'script st…

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Running Rspec examples by name, or: Running a single shared example

When an Rspec example fails, I usually investigate by running that example again using rspec <file:line>. However, this does not work with shared examples, since Rspec doesn't know in which context the shared example should be run.

But there is a different way: You can run the shared example using the -e, --example option. It takes a string value and runs all scenarios containing that substring in their full description.

This allows you to run a single uniquely named example, all examples with
similar names, all the examples in a u…

How to fix broken font collisions in wkhtmltopdf

If you are using PDFKit / wkhtmltopdf, you might as well want to use custom fonts in your stylesheets. Usually this should not be a problem, but at times they include misleading Meta-information that leads to a strange error in the PDF.

The setup

  • The designer gave you two fonts named something like BrandonText-Regular and BrandonText-Bold. (With flawed Meta-information)
  • You have a HTML string to be rendered by PDFKit
  • For demonstration purposes, this strin…
Repeats

PSA: Umlauts are not always what they seem to be

When you have a string containing umlauts which don't behave as expected (are not matched with a regexp, can't be found with an SQL query, do not print correctly on LaTeX documents, etc), you may be encountering umlauts which are not actually umlaut characters.

They look, depending on the font, like their "real" umlaut counterpart:

  • ä ↔ ä
  • ö ↔ ö
  • ü ↔ ü

However, they are not the same:

>> 'ä' == 'ä'
=> false
>> 'ä'.size
=> 1
>> 'ä'.size
=> 2

Looking at how those strings are constructed reveals what is going…

Custom Ruby method Enumerable#count_by (use for quick statistics)

I frequently find myself needing a combination of group_by, count and sort for quick statistics. Here's a method on Enumerable that combines the three:

module Enumerable
  def count_by(&block)
    list = group_by(&block)
      .map{ |key, items| [key, items.count] }
      .sort_by(&:last)
      
    Hash[list]
  end
end

# Returns a Hash of { key => count } pairs (see below)

Usage examples

  • Number of email addresses by domain:

```
> User.all.count_by { |user| user.email.sub /^.*@/, '' }
=> { "sina.cn"=>2, …, "hot…

Quickly printing data in columns on your Ruby console

Dump this method into your Ruby console to quickly print data in columns. This is helpful for e.g. comparing attributes of a set of Rails records.

def tp(objects, *method_names)
  terminal_width = `tput cols`.to_i
  cols = objects.count + 1 # Label column
  col_width = (terminal_width / cols) - 1 # Column spacing

  Array(method_names).map do |method_name|
    cells = objects.map{ |o| o.send(method_name).inspect }
    cells.unshift(method_name)

    puts cells.map{ |cell| cell.to_s.ljust(col_width) }.join ' '
  end

  nil
end

Usag…

Howto: Require gem that is not in Gemfile

Example: Require awesome_print in the console while it is not in Gemfile or .gemspec.

require 'awesome_print' => LoadError: cannot load such file -- awesome_print

gem install 'awesome_print'

$: << `/home/xxx/.rvm/rubies/ruby-x.x.x/lib/ruby/x.x.x/gems/awesome_print-x.x.x/lib`
require 'awesome_print' => true

Note: To find out the path quickly just look at $: to get the base path of your ruby dir and then append the gem with version of the output of gem install.


Alternatives:
Adding the gem to the developme…

How to view Image Metadata on the Linux Command Line with ImageMagick

ImageMagick has a command line tool called identify which can read image metadata:

```
>identify -verbose DSC00136.JPG
Image: DSC00136.JPG
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 5472x3648+0+0
Resolution: 350x350
Print size: 15.6343x10.4229
Units: PixelsPerInch
Type: TrueColor
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 0 (0)
max: 255 (1)
mean: 11…

Repeats

Google Analytics: Change the tracked URL path

By default, Google Analytics tracks the current URL for every request. Sometimes you will want to track another URL instead, for example:

  • When an application URL contains a secret (e.g. an access token)
  • When you want to track multiple URLs under the same bucket
  • When you want to track interactions that don't have a corresponding URL + request (e.g. a Javascript button or a PDF download)

Luckily the Analytics code snippet allows you to freely choose what path is being tracked. Simple change this:

ga('send', 'pageview');

… to th…

Bundler: Gemfile.lock is corrupt & gems are missing from the DEPENDENCIES section

So you're getting this failure when running bundle install on an older project:

Your Gemfile.lock is corrupt. The following gems are missing from the DEPENDENCIES section: 'archive-tar-minitar' 'hoe' 'rcov'

This happens when you are using a new version of Bundler with a project that was bundled with a very old version of Bundler. For reasons unknown, the Bundler dependency API returns different dependencies for some gems (like ruby-debug or rainpress) than the dependencies found in the downloaded gemspecs. While old versi…

Repeats

Invoices: How to properly round and calculate totals

While it might seem trivial to implement an invoice that sums up items and shows net, gross and vat totals, it actually involves a lot of rules and caveats. It is very easy to create invoices where numbers don't add up and a few cents are missing. A missing cent is a big deal for an accountant, so it is important for your invoices to list correct numbers.

Note that this is not legal advice. Also note that while this note has a number of code examples in Ruby and MySQL, the concepts apply to all programming languages and data stores.

When …

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AngularJS Cheat Sheet (PDF)

This cheat sheet … aims at providing a quick reference to
the most commonly used features in AngularJS.

Testing terminal output with RSpec

When testing Ruby code that prints something to the terminal, you can test that output.
Since RSpec 3.0 there is a very convenient way to do that.

Anything that writes to stdout (like puts or print) can be captured like this:

expect { something }.to output("hello\n").to_stdout

Testing stderr works in a similar fashion:

expect { something }.to output("something went wrogn\n").to_stderr

Hint: Use heredoc to test multi-line output.

expect { something }.to output(<<-MESSAGE.strip_heredoc).to_stdout...
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