Address implicit casts

src/Connection/MySqlConnection.php

@@ -85,7 +85,7 @@ public function delete(string $table, array $where): \PDOStatement
 
     public function formatFields(array $fields, string $table = '', string $prefix = ''): string
     {
-        if (!$fields) {
+        if ($fields === []) {
             throw new \InvalidArgumentException('No fields provided for the query');
         }
 
@@ -130,7 +130,7 @@ public function formatTable(string $table, string $alias = ''): string
      */
     private function formatConditions(array $conditions, array & $parameters): string
     {
-        if (!$conditions) {
+        if ($conditions === []) {
             throw new \InvalidArgumentException('No conditions provided for the query');
         }
 
@@ -160,7 +160,7 @@ private function formatClause(string $field, $value, array & $parameters): strin
                     return $value !== null;
                 });
 
-                if ($value) {
+                if ($value !== []) {
                     $placeholders = $this->formatParameters($value, $parameters);
                     return "($escaped IN $placeholders OR $escaped IS NULL)";
                 }
@@ -250,7 +250,7 @@ private function formatLimit(?int $limit, array & $parameters): string
      */
     private function formatAssignments(array $values, array & $parameters): string
     {
-        if (!$values) {
+        if ($values === []) {
             throw new \InvalidArgumentException('No values provided for the query');
         }
 
@@ -298,6 +298,10 @@ public function query(string $sql, array $parameters = []): \PDOStatement
     {
         $query = $this->getConnection()->prepare($sql);
 
+        if (! $query instanceof \PDOStatement) {
+            throw new \UnexpectedValueException('Unexpected value returned by prepare query');
+        }
+
         foreach ($parameters as $name => $value) {
             $this->bindQueryParameter($query, \is_int($name) ? $name + 1 : $name, $value);
         }

src/Record.php

@@ -213,7 +213,7 @@ public function associate(string $name, Model $model): void
             throw new \InvalidArgumentException('The associated record belongs to incorrect schema');
         }
 
-        while ($keys) {
+        while ($keys !== []) {
             $value = $record[array_pop($fields)];
 
             if ($value === null) {

src/Relationship.php

@@ -275,7 +275,7 @@ public function fillSingleRecord(Record $record, Record $referencedRecord): void
         $keys = $this->getFields();
         $fields = $this->getReferencedFields();
 
-        while ($keys) {
+        while ($keys !== []) {
             if ((string) $record[array_pop($keys)] !== (string) $referencedRecord[array_pop($fields)]) {
                 throw new \InvalidArgumentException('The provided records are not related');
             }

src/RelationshipFiller.php

@@ -102,7 +102,7 @@ private function fillRelationships(array $records, array $relationships): void
             $loaded = empty($filled) ? [] : array_merge(... array_values($filled));
             $options = array_keys(array_diff_key($options, $filled));
 
-            if ($options) {
+            if ($options !== []) {
                 $result = $this->connection->select($parent->getFields(), $parent->getTable(), [$field => $options]);
                 $result->setFetchMode(\PDO::FETCH_ASSOC);
 

tests/tests/MySqlIntegrationTest.php

@@ -4,6 +4,7 @@
 
 use Simply\Database\Connection\Connection;
 use Simply\Database\Connection\MySqlConnection;
+use Simply\Database\Connection\Provider\ConnectionProvider;
 use Simply\Database\Connection\Provider\GenericConnectionProvider;
 use Simply\Database\Connection\Provider\MySqlConnectionProvider;
 use Simply\Database\Test\TestCase\IntegrationTestCase;
@@ -115,4 +116,21 @@ public function testDSNSupport(): void
         $connection = new MySqlConnectionProvider('/tmp/mysql.sock', 'database', 'username', 'password');
         $this->assertContains('unix_socket', $property->getValue($connection));
     }
+
+    public function testHandlingFalsePrepare()
+    {
+        $pdo = $this->getMockBuilder(\PDO::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $pdo->expects($this->once())->method('prepare')->willReturn(false);
+
+        $connection = $this->createMock(ConnectionProvider::class);
+        $connection->method('getConnection')->willReturn($pdo);
+
+        $database = new MySqlConnection($connection);
+
+        $this->expectException(\UnexpectedValueException::class);
+        $database->query('SELECT * FROM `' . $this->personSchema->getTable() . '`');
+    }
 }