diff --git a/VariableAnalysis/Tests/BaseTestCase.php b/VariableAnalysis/Tests/BaseTestCase.php
index 072d2177..20759d97 100644
--- a/VariableAnalysis/Tests/BaseTestCase.php
+++ b/VariableAnalysis/Tests/BaseTestCase.php
@@ -19,7 +19,9 @@ public function prepareLocalFileForSniffs($sniffFiles, string $fixtureFile): Loc
   }
 
   public function getLineNumbersFromMessages(array $messages): array {
-    return array_keys($messages);
+    $lines = array_keys($messages);
+    sort($lines);
+    return $lines;
   }
 
   public function getWarningLineNumbersFromFile(LocalFile $phpcsFile): array {
diff --git a/VariableAnalysis/Tests/CodeAnalysis/VariableAnalysisTest.php b/VariableAnalysis/Tests/CodeAnalysis/VariableAnalysisTest.php
index 5bea562d..0dd95cc1 100644
--- a/VariableAnalysis/Tests/CodeAnalysis/VariableAnalysisTest.php
+++ b/VariableAnalysis/Tests/CodeAnalysis/VariableAnalysisTest.php
@@ -73,8 +73,8 @@ public function testFunctionWithGlobalVarWarnings() {
     $phpcsFile->process();
     $lines = $this->getWarningLineNumbersFromFile($phpcsFile);
     $expectedWarnings = [
-      7,
       4,
+      7,
       22,
     ];
     $this->assertEquals($expectedWarnings, $lines);
@@ -214,8 +214,8 @@ public function testFunctionWithReferenceWarnings() {
     $phpcsFile->process();
     $lines = $this->getWarningLineNumbersFromFile($phpcsFile);
     $expectedWarnings = [
-      20,
       8,
+      20,
       32,
       33,
       34,
@@ -363,13 +363,13 @@ public function testCompactWarnings() {
     $phpcsFile->process();
     $lines = $this->getWarningLineNumbersFromFile($phpcsFile);
     $expectedWarnings = [
+      2,
       7,
       10,
-      2,
-      23,
-      26,
       14,
       19,
+      23,
+      26,
     ];
     $this->assertEquals($expectedWarnings, $lines);
   }