Add test scripts and documentation

docs/contributing/how-to-test.md

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+
+Unit and Integration tests for Unity can be found under `src/tests/`.
+
+## Testing requirements
+Tests currently run with NUnit 2.6.4.
+
+## Running tests
+Tests can be run after building the Unity project. To run the tests execute `test.cmd` on Windows or `test.sh` on Mac.
+
+We use [Appveyor](https://ci.appveyor.com/project/github-windows/unity/build/tests) as the CI for this project to run tests, but it is also necessary to run tests locally when making code changes.

test.cmd

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+@echo off
+setlocal
+
+set Config=Debug
+if not %1.==. (
+  set Config=%1
+)
+
+set Exclude=''
+if not %2.==. (
+  set Exclude=%2
+)
+
+:: make sure at Unity project root directory
+set NunitDirectory=packages\NUnit.Runners.2.6.4\tools
+echo %NunitDirectory%
+set ConsoleRunner=%NunitDirectory%\nunit-console.exe
+echo %ConsoleRunner%
+
+:: run tests
+echo Running "build\IntegrationTests\IntegrationTests.dll" "build\IntegrationTests\TestUtils.dll" "build\TaskSystemIntegrationTests\TaskSystemIntegrationTests.dll" "build\UnitTests\TestUtils.dll" "build\UnitTests\UnitTests.dll" "src\tests\TestUtils\bin\%Config%\TestUtils.dll" /exclude=%Exclude%
+call %ConsoleRunner% "build\IntegrationTests\IntegrationTests.dll" "build\IntegrationTests\TestUtils.dll" "build\TaskSystemIntegrationTests\TaskSystemIntegrationTests.dll" "build\UnitTests\TestUtils.dll" "build\UnitTests\UnitTests.dll" "src\tests\TestUtils\bin\%Config%\TestUtils.dll" /exclude=%Exclude%
+
+endlocal

test.sh

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+#!/bin/sh -eu
+Configuration="Debug"
+if [ $# -gt 0 ]; then
+	Configuration=$1
+fi
+
+Exclude=""
+if [ $# -gt 1 ]; then
+	Exclude="/exclude=$2"
+fi
+
+NunitDirectory="packages\NUnit.Runners.2.6.4\tools"
+ConsoleRunner="$NunitDirectory\nunit-console.exe"
+
+$ConsoleRunner "build\IntegrationTests\IntegrationTests.dll" "build\IntegrationTests\TestUtils.dll" "build\TaskSystemIntegrationTests\TaskSystemIntegrationTests.dll" "build\UnitTests\TestUtils.dll" "build\UnitTests\UnitTests.dll" "src\tests\TestUtils\bin\\$Configuration\TestUtils.dll" $Exclude