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Testing Rails Service Oriented Architecture

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What are Monolithic Applications?

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What are Monolithic Applications? What is SOA?

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA !

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA Strategies for Testing SOA

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA Strategies for Testing SOA Develop Features for SOA application

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Monolithic Applications !

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Client-side ! Monolithic Applications !

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Client-side ! HTML ! Monolithic Applications !

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Client-side ! HTML ! JavaScript ! Monolithic Applications !

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Client-side ! HTML ! CSS ! JavaScript ! Monolithic Applications !

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Client-side Database Server-side Monolithic Applications !

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Client-side Database Server-side Monolithic Applications ! db !

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Client-side Database Server-side Monolithic Applications !

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Client-side Database Server-side Monolithic Applications ! HTTP requests !

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Client-side Database Server-side Monolithic Applications ! HTTP requests ! db queries !

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Client-side Database Server-side Monolithic Applications ! HTTP requests ! Domain Logic ! db queries !

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Client-side Database Server-side Monolithic Applications ! HTTP requests ! Domain Logic ! db queries ! Populate HTML views !

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Monolithic Applications ! Deploy Client-side Database Server-side

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Client-side Database Server-side Monolithic Applications ! School Management App !

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Service Oriented Architecture !

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Server-side Database No db Server-side Client-side Server-side Database Service Oriented Architecture !

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Service Oriented Architecture ! School API Web client Grading

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Service Oriented Architecture ! Grading Reporting School API Web client

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Service Oriented Architecture ! Grading Reporting School API Web client HTTP /JSON

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Service Oriented Architecture ! Grading Reporting School API Web client HTTP /JSON

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Service Oriented Architecture ! Grading Reporting School API Web client HTTP /JSON

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Service Oriented Architecture ! Grading Reporting School API Web client HTTP /JSON

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Service Oriented Architecture ! School API Web client

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Service Oriented Architecture ! Deploy School API Web client

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Service Oriented Architecture ! Deploy School API Web client

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Testing Monolithic Applications Testing Service Oriented Architecture VS

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Testing Monolithic Applications

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Testing Monolithic Applications HTML JavaScript HTTP Domain Logic

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Test

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Clean database

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Description

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Data creation

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State manipulation

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Assertion

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Assertion Passing!

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Testing Monolithic Applications rspec-rails factory_girl_rails database_cleaner Tools

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Testing Monolithic Applications rspec-rails factory_girl_rails database_cleaner Tools

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factory_girl_rails

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factory_girl_rails

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factory_girl_rails

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factory_girl_rails

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factory_girl_rails

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factory_girl_rails

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factory_girl_rails

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factory_girl makes creating test data easier

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Testing Monolithic Applications rspec-rails factory_girl_rails database_cleaner Tools

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database_cleaner

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Schools 0 Principals s 0 Students 0 Clean database database_cleaner

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Schools 1 Principals s 1 Students 1 database_cleaner

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Clean database Schools 0 Principals s 0 Students 0 database_cleaner

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database_cleaner makes destroying test data easier

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HTTP /JSON Testing Service Oriented Architecture School API Web client

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School API Web client HTTP /JSON Testing Service Oriented Architecture

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School API Web client HTTP /JSON No factory_girl No database_cleaner Testing Service Oriented Architecture

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This is why writing tests for SOA is hard especially for applications like Web Client

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Testing Rails SOA in the real world

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! ! ! Other ? Strategies

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No tests ! ! ! Other ? Strategies

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No tests ! ! ! Other ? Strategies

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No tests Stub HTTP requests from Web Client to School API ! ! ! ! Other ? Strategies

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No tests Stub HTTP requests from Web Client to School API Make HTTP requests from Web Client to School API and seed School API test database ! ! Other ? Strategies

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No tests Stub HTTP requests from Web Client to School API Make HTTP requests from Web Client to School API and seed School API test database Create/destroy data using School API’s API ! Other ? Strategies

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My experience with SOA

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/ \ /~- y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ /\ ~\ / \ Y V | \,-^-. | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () / / \ /~-~\ / y Y V ,-^-./ | \,-^- / { | } \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ \/ \/ \ \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \ { \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y ,-^ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V -^-./ | \,-^-. { | } \ \ | / A /\ \/ \ \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^ / { | } \ | /\ A / \ / /\ ~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ \ / .\-/. /\ () () /\ / \ /~-~\ / \ y Y V ,-^-./ | \,-^-. / { | } \ \ | / /\ A /\ / \/ \/ \ / \ My experience with SOA

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Developing Features for Web Client

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School API Web client HTTP /JSON Testing Service Oriented Architecture

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School API Web client HTTP /JSON No factory_girl No database_cleaner Testing Service Oriented Architecture

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features Unregister student from school

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features Unregister student from school Display count of registered students

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features Unregister student from school Display count of registered students View student profile

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features Unregister student from school Display count of registered students View student profile Edit student profile

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features Unregister student from school Display count of registered students View student profile Edit student profile

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Stub HTTP Requests from Web Client to School API Strategy #1

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Strategy #1 Stub HTTP Requests from Web Client to School API

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Web Client Dev:

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Web Client Dev: Finished the feature. Tests are green.

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Web Client Dev: Finished the feature. Tests are green. School API Dev:

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Web Client Dev: Finished the feature. Tests are green. School API Dev: Great!

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Web Client Dev: Finished the feature. Tests are green. School API Dev: Great! Web Client Dev:

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Web Client Dev: Finished the feature. Tests are green. School API Dev: Great! Web Client Dev: I deployed. I also told the customer.

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Web Client Dev: Finished the feature. Tests are green. School API Dev: Great! Web Client Dev: I deployed. I also told the customer. Customer:

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Web Client Dev: Finished the feature. Tests are green. School API Dev: Great! Web Client Dev: I deployed. I also told the customer. Customer: The site is down :/

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Web Client Dev:

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Web Client Dev: What!? My tests were green.

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School API Dev: Web Client Dev: What!? My tests were green.

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School API Dev: I renamed /pupils to /students Web Client Dev: What!? My tests were green.

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School API Dev: I renamed /pupils to /students School API Dev: Web Client Dev: What!? My tests were green.

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School API Dev: I renamed /pupils to /students School API Dev: Ooops. I forgot to tell you :( Web Client Dev: What!? My tests were green.

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School API Dev: I renamed /pupils to /students Web Client Dev: School API Dev: Ooops. I forgot to tell you :( Web Client Dev: What!? My tests were green.

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School API Dev: I renamed /pupils to /students Web Client Dev: ¯\_(π)_/¯ School API Dev: Ooops. I forgot to tell you :( Web Client Dev: What!? My tests were green.

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Web Client Dev:

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Web Client Dev: Tell me when you make changes, please :)

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School API Dev: Web Client Dev: Tell me when you make changes, please :)

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School API Dev: It won’t happen again. Promise <3 Web Client Dev: Tell me when you make changes, please :)

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but, it does.

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This is WHY you need integration tests in Service Oriented Architecture

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X Strategy #1 Stub HTTP Requests from Web client to School API

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Fast X Strategy #1 Stub HTTP Requests from Web client to School API

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False confidence Fast X Strategy #1 Stub HTTP Requests from Web client to School API

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False confidence Fast X Strategy #1 Stub HTTP Requests from Web client to School API

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features Unregister student from school Display count of registered students View student profile Edit student profile

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Web Client dev no longer trusts the Web Client’s test suite. Problem with previous strategy:

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Solution: Make HTTP requests to School API when runnig Web Client’s test suite Web Client dev no longer trusts the Web Client’s test suite. Problem with previous strategy:

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Strategy #2 Make HTTP requests and seed School API database

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Strategy #2 Make HTTP requests and seed School API database Seed School API test database

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Strategy #2 Make HTTP requests and seed School API database Start School API server in test env Seed School API test database

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Start School API server in test env Web Client issues HTTP requests to School API Seed School API test database Strategy #2 Make HTTP requests and seed School API database

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1 test Schools 1 Principals s 1 Students 1 School API Web Client Before

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Schools 1 Principals s 1 Students 1 #1 School API test db

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Schools 1 Principals s 1 Students 1 #1 School API test db

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Schools 1 Principals s 1 Students 0 #1 School API test db

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Schools 1 Principals s 1 Students 0 #1 School API test db Passing!

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1 test Schools 1 Principals s 1 Students 0 School API Web Client 1 passing After

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features Unregister student from school Display count of registered students View student profile Edit student profile

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2 tests Schools 1 Principals s 1 Students 1 School API Web Client Before

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Schools 1 Principals s 1 Students 0 #1 School API test db Passing!

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#2 Schools 1 Principals s 1 Students 0 School API test db

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#2 Schools 1 Principals s 1 Students 0 School API test db

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#2 Schools 1 Principals s 1 Students 0 School API test db FAILS!

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There has to be a better way

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X Seed School API db AND issue HTTP requests Strategy #2

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Confidence X Seed School API db AND issue HTTP requests Strategy #2

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Manage School API server Confidence X Seed School API db AND issue HTTP requests Strategy #2

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Manage School API server Bleed state between tests Confidence X Seed School API db AND issue HTTP requests Strategy #2

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Problem with previous strategy Frequently updating seed data for School API test database

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Problem with previous strategy Solution Create the test data needed for each test Frequently updating seed data for School API test database when each test is run

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Create test data using School API’s API Strategy #3

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Create test data using School API’s API Strategy #3 Start School API server in test env

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Create test data using School API’s API Strategy #3 Start School API server in test env Web Client issues HTTP requests to School API

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features Unregister student from school Display count of registered students View student profile Edit student profile

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Customer:

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Customer: You there?

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Customer: Web Client Dev: You there?

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Customer: Web Client Dev: You there? Yep, need something?

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Customer: Web Client Dev: You there? Yep, need something? Customer:

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Customer: Web Client Dev: You there? Yep, need something? Customer: I forgot to mention, you can NOT create a school through School API public API.

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Can NOT use Strategy #3

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Can NOT use

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X Strategy #3 Create test data using School API’s API

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Confidence X Strategy #3 Create test data using School API’s API

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Manage School API server Confidence X Strategy #3 Create test data using School API’s API

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Manage School API server Not possible ! Confidence X Strategy #3 Create test data using School API’s API

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Manage School API server Not possible Creating complex data associations ! Confidence X Strategy #3 Create test data using School API’s API

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Manage School API server Not possible Creating complex data associations Bleed state between tests Confidence X Strategy #3 Create test data using School API’s API

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Problem with previous strategy Can not create school with School API’s API

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Problem with previous strategy Solution Create a school, but with School API’s API Can not create school with School API’s API

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We need a Strategy #4

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I want to create test data in School API test database with factory_girl from the Web Client

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remote_factory_girl Strategy #4

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remote_factory_girl Strategy #4 Install remote_factory_girl_home_rails in School API

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Gemfile School API

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config/environments/test.rb School API

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config/routes.rb School API

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remote_factory_girl Strategy #4 Install remote_factory_girl_home_rails in School API Install remote_factory_girl in Web Client

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Gemfile Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb client

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spec/spec_helper.rb client

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remote_factory_girl Strategy #4 Start School API server in test env Install remote_factory_girl_home_rails in School API Install remote_factory_girl in Web Client

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remote_factory_girl Strategy #4 Start School API server in test env Web Client issues HTTP requests to School API Install remote_factory_girl_home_rails in School API Install remote_factory_girl in Web Client

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features Unregister student from school Display count of registered students View student profile Edit student profile

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2 tests Schools 0 Principals s 0 Students 0 School API Web Client Before

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#1 Schools 0 Principals s 0 Students 0 School API test db

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#1 Schools 1 Principals s 1 Students 1 School API test db

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#1 Schools 1 Principals s 1 Students 0 School API test db

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#1 Schools 1 Principals s 1 Students 0 School API test db

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Passing! #1 Schools 1 Principals s 1 Students 0 School API test db

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#2 Schools 1 Principals s 1 Students 0 School API test db

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#2 Passing! Schools 2 Principals s 2 Students 0 School API test db

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2 tests Schools 2 Principals s 2 Students 0 School API Web Client 2 passing After

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Features Unregister student from school Display count of registered students View student profile Edit student profile

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3 tests School API Web Client Before Schools 0 Principals s 0 Students 0

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#1 Schools 1 Principals s 1 Students 0 School API test db Passing!

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#2 Schools 2 Principals s 2 Students 0 School API test db Passing!

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#3 Passing! Schools 3 Principals s 3 Students 1 School API test db

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3 tests Schools 3 Principals s 3 Students 1 School API Web Client 3 passing After

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Customer:

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Customer: You there?

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Customer: School API Dev: You there?

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Customer: School API Dev: You there? Yep, need something?

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Customer: You there? Yep, need something? Customer: School API Dev:

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Customer: You there? Yep, need something? Customer: Student emails have to be UNIQUE. School API Dev:

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Customer: You there? Yep, need something? Customer: Student emails have to be UNIQUE. School API Dev: School API Dev:

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Customer: You there? Yep, need something? Customer: Student emails have to be UNIQUE. School API Dev: Ok. Not a problem. School API Dev:

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features Unregister student from school Display count of registered students View student profile Edit student profile

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4 tests Schools 0 Principals s 0 Students 0 School API Web Client Before

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#1 Schools 1 Principals s 1 Students 0 School API test db Passing!

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#2 Schools 2 Principals s 2 Students 0 School API test db Passing!

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#3 Passing! Schools 3 Principals s 3 Students 1 School API test db

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#4 FAILS! Schools 3 Principals s 3 Students 1 School API test db student email has to be unique

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There has to be a better way

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X remote_factory_girl Strategy #4

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Confidence ! X remote_factory_girl Strategy #4

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Confidence Create complex test data ! X remote_factory_girl Strategy #4

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Confidence Create complex test data Create data not available through API X remote_factory_girl Strategy #4

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Manage School API server ! Confidence Create complex test data Create data not available through API X remote_factory_girl Strategy #4

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Manage School API server Bleed state between tests Confidence Create complex test data Create data not available through API X remote_factory_girl Strategy #4

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Problem with previous strategy State in School API test database persists between tests in Web Client

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Problem with previous strategy Solution Destroy test data after each test with remote_database_cleaner State in School API test database persists between tests in Web Client

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remote_database_cleanear Strategy #5

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remote_database_cleanear Strategy #5 Install remote_database_cleaner_home_rails in School API

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Gemfile School API

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config/environments/test.rb School API

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config/routes.rb School API

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remote_database_cleanear Strategy #5 Install remote_database_cleaner_home_rails in School API Install remote_database_cleaner in Web Client

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Gemfile Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb Web Client

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spec/spec_helper.rb Web Client

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remote_database_cleanear Strategy #5 Start School API server in test env Install remote_database_cleaner_home_rails in School API Install remote_database_cleaner in Web Client

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remote_database_cleanear Strategy #5 Start School API server in test env Install remote_database_cleaner_home_rails in School API Install remote_database_cleaner in Web Client Web Client issues HTTP requests to School API

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features Unregister student from school Display count of registered students View student profile Edit student profile

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4 tests Schools 0 Principals s 0 Students 0 School API Web Client Before

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#1 Schools 0 Principals s 0 Students 0 School API test db Passing!

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#2 Passing! Schools 0 Principals s 0 Students 0 School API test db

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#3 Passing! Schools 0 Principals s 0 Students 0 School API test db

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#4 Schools 0 Principals s 0 Students 0 School API test db Passing!

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4 tests Schools 0 Principals s 0 Students 0 School API Web Client 4 passing After

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X remote_database_cleaner Strategy #4

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Does not bleed state between tests ! X remote_database_cleaner Strategy #4

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Manage School API server ! Does not bleed state between tests ! X remote_database_cleaner Strategy #4

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Now the applications are also setup for Continuous Integration - Jenkins

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The Takeaway Integration tests give us more confidence in SOA

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The Takeaway Integration tests give us more confidence in SOA Requires more setup initially

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The Takeaway Integration tests give us more confidence in SOA Requires more setup initially

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The Takeaway Integration tests give us more confidence in SOA Requires more setup initially But, pays dividends in the long run

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blog: http://www.bignerdranch.com/blog/testing-rails-service-oriented-architecture/ example: https://github.com/tdouce/soa_integration_testing

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What are Monolithic Applications?

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What are Monolithic Applications? What is SOA?

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA !

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA Strategies for Testing SOA

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What are Monolithic Applications? What is SOA? Testing Monolithic Applications Testing SOA Challenges with Testing SOA Strategies for Testing SOA Develop Features for SOA application

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Questions?