diff --git a/core/tests/Drupal/Tests/ComposerIntegrationTest.php b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
index e7012e8..266cbeb 100644
--- a/core/tests/Drupal/Tests/ComposerIntegrationTest.php
+++ b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
@@ -188,7 +188,14 @@ public function testAllModulesReplaced() {
    *   testing in https://www.drupal.org/node/2874198
    */
   public function testMinPHPVersion() {
-    $lock = json_decode(file_get_contents($this->root . '/composer.lock'), TRUE);
+    // Check for lockfile in the application root. If the lockfile does not
+    // exist, then skip this test.
+    $lockfile = $this->root . '/composer.lock';
+    if (!file_exists($lockfile)) {
+      $this->markTestSkipped('/composer.lock is not available.');
+    }
+
+    $lock = json_decode(file_get_contents($lockfile), TRUE);
 
     foreach ($lock['packages'] as $package) {
       if (isset($package['require']['php'])) {