Fix code style

src/Credentials/ExternalAccountCredentials.php

@@ -281,7 +281,7 @@ public function fetchAuthToken(callable $httpHandler = null)
 
     public function getCacheKey()
     {
-        return implode(":", $this->flattenJsonKey($this->jsonKey)) . ':' . $this->auth->getFormattedScopeOrAudience();
+        return implode(':', $this->flattenJsonKey($this->jsonKey)) . ':' . $this->auth->getFormattedScopeOrAudience();
     }
 
     public function getLastReceivedToken()
@@ -367,7 +367,7 @@ private function flattenJsonKey($arr): array
     {
         $result = [];
 
-        foreach($arr as $key => $val){
+        foreach($arr as $key => $val) {
             if (is_array($val)) {
                 $result = array_merge($result, $this->flattenJsonKey($val));
             } elseif ($val === '') {

src/Credentials/ServiceAccountJwtAccessCredentials.php

@@ -170,7 +170,7 @@ public function fetchAuthToken(callable $httpHandler = null)
      */
     public function getCacheKey()
     {
-        return $this->auth->getIssuer() . ":" . $this->auth->getFormattedScopeOrAudience();
+        return $this->auth->getIssuer() . ':' . $this->auth->getFormattedScopeOrAudience();
     }
 
     /**

tests/Credentials/ExternalAccountCredentialsTest.php

@@ -524,12 +524,12 @@ public function testFetchAuthTokenWithWorkforcePoolCredentials()
     public function testCacheKeyFormat()
     {
         $credentials = new ExternalAccountCredentials('scope1', $this->baseCreds);
-        $cacheKey = $credentials->getCacheKey();        
+        $cacheKey = $credentials->getCacheKey();
 
         // I decided to hand craft this manually to avoid reusing the flattenJsonKey method
-        // inside the ExternalAccountCredentials class and make 
+        // inside the ExternalAccountCredentials class and make
         // sure the flat function works properly
-        $expectedKey = 'external_account:token-url.com:sts-url.com:scope1'; 
+        $expectedKey = 'external_account:token-url.com:sts-url.com:scope1';
         $this->assertEquals($expectedKey, $cacheKey);
     }