diff --git a/.github/workflows/test-phpunit.yml b/.github/workflows/test-phpunit.yml
new file mode 100644
index 000000000000..9f1a4b3744bb
--- /dev/null
+++ b/.github/workflows/test-phpunit.yml
@@ -0,0 +1,104 @@
+name: PHPUnit
+
+on:
+  pull_request:
+    branches:
+      - develop
+      - '4.*'
+
+jobs:
+
+  tests:
+    runs-on: ubuntu-latest
+
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
+
+    name: PHP ${{ matrix.php-versions }} - ${{ matrix.db-platforms }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4']
+        db-platforms: ['MySQLi', 'Postgre', 'SQLite3']
+
+    services:
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_DATABASE: test
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: test
+        ports:
+          - 5432:5432
+        options: --health-cmd=pg_isready --health-interval=10s --health-timeout=5s --health-retries=3
+      redis:
+        image: redis
+        ports:
+          - 6379:6379
+        options: --health-cmd "redis-cli ping" --health-interval=10s --health-timeout=5s --health-retries=3
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: composer:v2
+          extensions: imagick
+          coverage: xdebug
+        env:
+          update: true
+
+      - name: Install Memcached
+        uses: niden/actions-memcached@v7
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-progress --no-suggest --no-interaction --prefer-dist --optimize-autoloader
+        env:
+          COMPOSER_AUTH: ${{ secrets.COMPOSER_AUTH }}     
+
+      - name: Test with PHPUnit
+        run: script -e -c "vendor/bin/phpunit -v"
+        env:
+          DB: ${{ matrix.db-platforms }}
+          TERM: xterm-256color
+
+      - name: Run Coveralls
+        run: |
+          composer global require twinh/php-coveralls
+          php-coveralls --coverage_clover=build/logs/clover.xml -v
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_PARALLEL: true
+          COVERALLS_FLAG_NAME: PHP ${{ matrix.php-versions }}
+
+  coveralls-finish:
+    needs: [tests]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          parallel-finished: true
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 551f48120074..000000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,60 +0,0 @@
-language: php
-
-php:
-  - 7.2
-  - 7.3
-  - 7.4
-  - nightly
-
-matrix:
-  fast_finish: true
-  allow_failures:
-    - php: nightly
-
-global:
-  - CI=true
-  - CI_ENVIRONMENT=testing
-
-# Recommended by Travis support
-sudo: required
-dist: xenial
-group: edge
-
-env:
-  - DB=mysqli
-  - DB=postgres
-  - DB=sqlite
-
-services:
-  - memcached
-  - mysql
-  - postgresql
-  - redis-server
-
-cache:
-  directories:
-    - vendor
-
-script:
-  - php vendor/bin/phpunit -v
-
-before_install:
-  - mysql -e "CREATE DATABASE IF NOT EXISTS test;" -uroot;
-  - mysql -e "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'test';" -uroot
-  - psql -c 'CREATE DATABASE test;' -U postgres
-  - sudo apt-get install ghostscript
-  - yes | pecl install imagick
-
-before_script:
-  - echo 'extension = memcached.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - echo 'extension = redis.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - |
-    if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.2" ]]; then
-      git clone -b stable https://github.com/jedisct1/libsodium.git
-      cd libsodium && sudo ./configure && sudo make check && sudo make install && cd ..
-      printf "\n" | pecl install -f libsodium
-    fi
-  - composer install --prefer-source
-
-after_success:
-  - travis_retry php tests/bin/php-coveralls.phar -v
diff --git a/README.md b/README.md
index 1a4575702398..41bc739b5203 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CodeIgniter 4 Development
 
-[![Build Status](https://travis-ci.org/codeigniter4/CodeIgniter4.svg?branch=develop)](https://travis-ci.org/codeigniter4/CodeIgniter4)
+[![Build Status](https://github.com/codeigniter4/CodeIgniter4/workflows/PHPUnit/badge.svg?branch=develop)](https://github.com/codeigniter4/CodeIgniter4/actions?query=workflow%3A%22PHPUnit%22)
 [![Coverage Status](https://coveralls.io/repos/github/codeigniter4/CodeIgniter4/badge.svg?branch=develop)](https://coveralls.io/github/codeigniter4/CodeIgniter4?branch=develop)
 [![Downloads](https://poser.pugx.org/codeigniter4/framework/downloads)](https://packagist.org/packages/codeigniter4/framework)
 [![GitHub release (latest by date)](https://img.shields.io/github/v/release/codeigniter4/CodeIgniter4)](https://packagist.org/packages/codeigniter4/framework)
diff --git a/app/Config/Database.php b/app/Config/Database.php
index ba60dcafda47..a0b46c35f45a 100644
--- a/app/Config/Database.php
+++ b/app/Config/Database.php
@@ -88,21 +88,6 @@ public function __construct()
 		if (ENVIRONMENT === 'testing')
 		{
 			$this->defaultGroup = 'tests';
-
-			// Under Travis-CI, we can set an ENV var named 'DB_GROUP'
-			// so that we can test against multiple databases.
-			if ($group = getenv('DB'))
-			{
-				if (is_file(TESTPATH . 'travis/Database.php'))
-				{
-					require TESTPATH . 'travis/Database.php';
-
-					if (! empty($dbconfig) && array_key_exists($group, $dbconfig))
-					{
-						$this->tests = $dbconfig[$group];
-					}
-				}
-			}
 		}
 	}
 
diff --git a/app/Views/errors/cli/error_exception.php b/app/Views/errors/cli/error_exception.php
index 592dd6e24833..be2abc5879f3 100644
--- a/app/Views/errors/cli/error_exception.php
+++ b/app/Views/errors/cli/error_exception.php
@@ -62,7 +62,7 @@
 				default:
 					return var_export($value, true);
 			}
-		}, array_values($error['args'])));
+		}, array_values($error['args'] ?? [])));
 
 		$function .= '(' . $args . ')';
 
diff --git a/tests/_support/Config/Registrar.php b/tests/_support/Config/Registrar.php
new file mode 100644
index 000000000000..47c2fbfda769
--- /dev/null
+++ b/tests/_support/Config/Registrar.php
@@ -0,0 +1,98 @@
+<?php namespace Tests\Support\Config;
+
+/**
+ * Class Registrar
+ *
+ * Provides a basic registrar class for testing BaseConfig registration functions.
+ */
+
+class Registrar
+{
+	/**
+	 * DB config array for testing purposes.
+	 *
+	 * @var array
+	 */
+	protected static $dbConfig = [
+		'MySQLi'  => [
+			'DSN'      => '',
+			'hostname' => '127.0.0.1',
+			'username' => 'root',
+			'password' => '',
+			'database' => 'test',
+			'DBDriver' => 'MySQLi',
+			'DBPrefix' => 'db_',
+			'pConnect' => false,
+			'DBDebug'  => (ENVIRONMENT !== 'production'),
+			'charset'  => 'utf8',
+			'DBCollat' => 'utf8_general_ci',
+			'swapPre'  => '',
+			'encrypt'  => false,
+			'compress' => false,
+			'strictOn' => false,
+			'failover' => [],
+			'port'     => 3306,
+		],
+		'Postgre' => [
+			'DSN'      => '',
+			'hostname' => 'localhost',
+			'username' => 'postgres',
+			'password' => 'postgres',
+			'database' => 'test',
+			'DBDriver' => 'Postgre',
+			'DBPrefix' => 'db_',
+			'pConnect' => false,
+			'DBDebug'  => (ENVIRONMENT !== 'production'),
+			'charset'  => 'utf8',
+			'DBCollat' => 'utf8_general_ci',
+			'swapPre'  => '',
+			'encrypt'  => false,
+			'compress' => false,
+			'strictOn' => false,
+			'failover' => [],
+			'port'     => 5432,
+		],
+		'SQLite3' => [
+			'DSN'      => '',
+			'hostname' => 'localhost',
+			'username' => '',
+			'password' => '',
+			'database' => 'database.db',
+			'DBDriver' => 'SQLite3',
+			'DBPrefix' => 'db_',
+			'pConnect' => false,
+			'DBDebug'  => (ENVIRONMENT !== 'production'),
+			'charset'  => 'utf8',
+			'DBCollat' => 'utf8_general_ci',
+			'swapPre'  => '',
+			'encrypt'  => false,
+			'compress' => false,
+			'strictOn' => false,
+			'failover' => [],
+			'port'     => 3306,
+		],
+	];
+
+	/**
+	 * Override database config
+	 *
+	 * @return array
+	 */
+	public static function Database()
+	{
+		$config = [];
+
+		// Under Github Actions, we can set an ENV var named 'DB'
+		// so that we can test against multiple databases.
+		if ($group = getenv('DB'))
+		{
+			if (! empty(self::$dbConfig[$group]))
+			{
+				$config['tests'] = self::$dbConfig[$group];
+			}
+		}
+
+		return $config;
+	}
+
+}
diff --git a/tests/bin/php-coveralls.phar b/tests/bin/php-coveralls.phar
deleted file mode 100755
index 30523379b445..000000000000
Binary files a/tests/bin/php-coveralls.phar and /dev/null differ
diff --git a/tests/travis/Database.php b/tests/travis/Database.php
deleted file mode 100644
index 93a618013e0c..000000000000
--- a/tests/travis/Database.php
+++ /dev/null
@@ -1,62 +0,0 @@
-<?php
-
-$dbconfig = [
-
-   'mysqli'   => [
-	   'DSN'      => '',
-	   'hostname' => 'localhost',
-	   'username' => 'travis',
-	   'password' => '',
-	   'database' => 'test',
-	   'DBDriver' => 'MySQLi',
-	   'DBPrefix' => 'db_',
-	   'pConnect' => false,
-	   'DBDebug'  => (ENVIRONMENT !== 'production'),
-	   'charset'  => 'utf8',
-	   'DBCollat' => 'utf8_general_ci',
-	   'swapPre'  => '',
-	   'encrypt'  => false,
-	   'compress' => false,
-	   'strictOn' => false,
-	   'failover' => [],
-   ],
-
-   'postgres' => [
-	   'DSN'      => '',
-	   'hostname' => 'localhost',
-	   'username' => 'postgres',
-	   'password' => '',
-	   'database' => 'test',
-	   'DBDriver' => 'Postgre',
-	   'DBPrefix' => 'db_',
-	   'pConnect' => false,
-	   'DBDebug'  => (ENVIRONMENT !== 'production'),
-	   'charset'  => 'utf8',
-	   'DBCollat' => 'utf8_general_ci',
-	   'swapPre'  => '',
-	   'encrypt'  => false,
-	   'compress' => false,
-	   'strictOn' => false,
-	   'failover' => [],
-   ],
-
-   'sqlite'   => [
-	   'DSN'      => '',
-	   'hostname' => 'localhost',
-	   'username' => '',
-	   'password' => '',
-	   'database' => 'database.db',
-	   'DBDriver' => 'SQLite3',
-	   'DBPrefix' => 'db_',
-	   'pConnect' => false,
-	   'DBDebug'  => (ENVIRONMENT !== 'production'),
-	   'charset'  => 'utf8',
-	   'DBCollat' => 'utf8_general_ci',
-	   'swapPre'  => '',
-	   'encrypt'  => false,
-	   'compress' => false,
-	   'strictOn' => false,
-	   'failover' => [],
-   ],
-
-];