diff --git a/.gitignore b/.gitignore
index f2db597..05006ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@ composer.lock
 vendor
 phpunit.xml
 clover.xml
+.phpunit.result.cache
+.idea/
diff --git a/.travis.yml b/.travis.yml
index 329b5b9..6284a3e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ php:
   - '7.0'
   - '7.1'
   - '7.2'
+  - '7.3'
 before_script:
   - composer update
 script: composer test
diff --git a/tests/phpunit/WordPressCoreInstallerTest.php b/tests/phpunit/WordPressCoreInstallerTest.php
index 3cc5593..539bf36 100644
--- a/tests/phpunit/WordPressCoreInstallerTest.php
+++ b/tests/phpunit/WordPressCoreInstallerTest.php
@@ -31,14 +31,6 @@
 
 class WordPressCoreInstallerTest extends TestCase {
 
-	protected function setUp() {
-		$this->resetInstallPaths();
-	}
-
-	protected function tearDown() {
-		$this->resetInstallPaths();
-	}
-
 	public function testSupports() {
 		$installer = new WordPressCoreInstaller( new NullIO(), $this->createComposer() );
 
@@ -123,11 +115,11 @@ public function testCorePackageDefaultDoesNotOverrideRootDirectoryDefinition() {
 		$this->assertEquals( 'wp', $installer->getInstallPath( $package ) );
 	}
 
-	/**
-	 * @expectedException \InvalidArgumentException
-	 * @expectedExceptionMessage Two packages (test/bazbat and test/foobar) cannot share the same directory!
-	 */
 	public function testTwoPackagesCannotShareDirectory() {
+		$this->jpbExpectException(
+			'\InvalidArgumentException',
+			'Two packages (test/bazbat and test/foobar) cannot share the same directory!'
+		);
 		$composer  = $this->createComposer();
 		$installer = new WordPressCoreInstaller( new NullIO(), $composer );
 		$package1  = new Package( 'test/foobar', '1.1.1.1', '1.1.1.1' );
@@ -138,11 +130,14 @@ public function testTwoPackagesCannotShareDirectory() {
 	}
 
 	/**
-	 * @dataProvider                   dataProviderSensitiveDirectories
-	 * @expectedException \InvalidArgumentException
-	 * @expectedExceptionMessageRegExp /Warning! .+? is an invalid WordPress install directory \(from test\/package\)!/
+	 * @dataProvider dataProviderSensitiveDirectories
 	 */
 	public function testSensitiveInstallDirectoriesNotAllowed( $directory ) {
+		$this->jpbExpectException(
+			'\InvalidArgumentException',
+			'/Warning! .+? is an invalid WordPress install directory \(from test\/package\)!/',
+			true
+		);
 		$composer  = $this->createComposer();
 		$installer = new WordPressCoreInstaller( new NullIO(), $composer );
 		$package   = new Package( 'test/package', '1.1.0.0', '1.1' );
@@ -157,7 +152,11 @@ public function dataProviderSensitiveDirectories() {
 		);
 	}
 
-	private function resetInstallPaths() {
+	/**
+	 * @before
+	 * @afterClass
+	 */
+	public static function resetInstallPaths() {
 		$prop = new \ReflectionProperty( '\johnpbloch\Composer\WordPressCoreInstaller', '_installedPaths' );
 		$prop->setAccessible( true );
 		$prop->setValue( array() );
@@ -173,4 +172,17 @@ private function createComposer() {
 		return $composer;
 	}
 
+	private function jpbExpectException( $class, $message = '', $isRegExp = false ) {
+		if ( method_exists( $this, 'expectException' ) ) {
+			$this->expectException($class);
+			if ( $message ) {
+				$isRegExp || $this->expectExceptionMessage( $message );
+				$isRegExp && $this->expectExceptionMessageRegExp( $message );
+			}
+		} else {
+			$isRegExp || $this->setExpectedException( $class, $message );
+			$isRegExp && $this->setExpectedExceptionRegExp( $class, $message );
+		}
+	}
+
 }