diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 000000000..1fb3e8592
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1,2 @@
+*.phar
+.phpunit.result.cache
diff --git a/tests/README.md b/tests/README.md
index 7aa410c2f..cd1227047 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -5,13 +5,17 @@ The `compile_test.sh` shell script just verifies all PHP files compile
 successfully.  Please use this before pushing any commits upstream.
 
 Any other files should be PHP unit tests based on
-[PHPUnit](https://phpunit.de/index.html) version 5.7,
-which is the latest version that supports PHP 5.X.  (The newer version of
-PHPUnit requires PHP7.)
+[PHPUnit](https://phpunit.de/index.html) version 8.0
+which requires PHP 7.2.
+
+Download a copy of phpunit-8.0 and place the phar file in your tools
+directory:
+
+    wget https://phar.phpunit.de/phpunit-8.0.phar
 
 Example usage for a single file:
 
-    phpunit --bootstrap ../includes/functions.php functionsTest.php
+    php phpunit-8.0.phar --bootstrap ../includes/functions.php functionsTest.php
 
 
 
diff --git a/tests/functionsTest.php b/tests/functionsTest.php
index 8f03d9453..49561099e 100644
--- a/tests/functionsTest.php
+++ b/tests/functionsTest.php
@@ -25,7 +25,19 @@ public function test_activate_urls() {
   }
 
   public function test_add_dstfree_time() {
-    // TODO
+    // 03/09/2019 @ 12:00pm (UTC) = day before DST starts
+    // adding 1 day should be 23 hours diff
+    $time = 1552132800;
+    $res = add_dstfree_time ( $time, 86400 );
+    $diff = $res - $time;
+    $hours = $diff / 3600;
+    $this->assertEquals ( 23, $hours );
+    // add another day and we should get 24 hours
+    $time += 3600 * 24;
+    $res = add_dstfree_time ( $time, 86400 );
+    $diff = $res - $time;
+    $hours = $diff / 3600;
+    $this->assertEquals ( 24, $hours );
   }
 
   public function test_add_duration() {
diff --git a/tests/run_unit_tests.sh b/tests/run_unit_tests.sh
index 15e809189..bad0046a7 100755
--- a/tests/run_unit_tests.sh
+++ b/tests/run_unit_tests.sh
@@ -2,6 +2,6 @@
 #
 # Please add new unit test files below.
 
-phpunit --bootstrap ../includes/functions.php functionsTest.php
+php phpunit-8.0.phar --bootstrap ../includes/functions.php functionsTest.php
 
 exit 0