What is the purpose of this pull request? (put "X" next to an item, remove the rest)

• [X] New feature

Fixes #574

What is the rationale for this request?

Some features, such as tagging, must be tested on different sites since the test cases are mutually exclusive.

What changes did you make? (Give an overview)

Allow support for any number of test sites.

Revamped test directory structure:

• Old:

test/
  unit/
    (unit tests)
  test_site/
    (site files)
    test.sh
    test.bat
    testUtil/
      (test utils)

• New:

test/
  unit/
    (unit tests)
  functional/
    test.sh
    test.bat
    testUtil/
      (test utils)
    test_site/
      (test site files)
    test_site_2/
      (test site 2 files)
    test_site etc... /
      (...)

Creating a new test site:

• Create a folder in test/functional
• Run markbind init in the folder, write test site as per normal
• Create an expected directory within the folder and populate with expected files
• Add the folder name to these two lines:

test.sh

set sites=test_site test_site_2   // Add the folder name here

test.bat

declare -a sites=("test_site" "test_site_2")   // Add the folder name here

Note: Ensure expected directory is ignored (Add expected/* to the site.json ignore), and that no src or glob matches any of the expected files (the default glob **/*.+(md|mbd) causes some problems)

Is there anything you'd like reviewers to focus on?

The current test_site_2 folder is just there to show the feature works, it stores a fresh init site. Will remove before merge. No edits made to test_site, except for removing 3 lines from the site.json

How do we want to organize the tests? For example, say we have:

• Feature A: Test case A1 and Test case A2 are mutually exclusive
• Feature B: Test case B1 and Test case B2 are mutually exclusive

We could do something like this:

• Site 1: Other tests
• Site 2: A1, B1
• Site 3: A2, B2