Default children property to empty array

This makes sure the property is countable and doesn't lead
to warnings in newer versions of PHP.

src/AbstractSynopsis.php

@@ -31,7 +31,7 @@ abstract class AbstractSynopsis
     /**
      * @var array the kiddos
      */
-    protected $children;
+    protected $children = [];
 
     /**
      * @var Factory the synopsis factory (used for cascaded creation of synopsises)

tests/BooleanSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(1, $synopsis->getLength());
         $this->assertEquals('true', $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/DoubleSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(3, $synopsis->getLength());
         $this->assertEquals(3.4, $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/IntegerSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(1, $synopsis->getLength());
         $this->assertEquals(3, $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/NullSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(0, $synopsis->getLength());
         $this->assertEquals(null, $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/Resource/FileSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(11, $synopsis->getLength());
         $this->assertEquals('php://stdin', $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/Resource/StreamSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(11, $synopsis->getLength());
         $this->assertEquals('php://stdin', $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/ResourceSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(0, $synopsis->getLength());
         $this->assertEquals('', $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/StandardSynopsisTest.php

@@ -65,6 +65,6 @@ public function testProcess($original, $type, $length, $value)
         $this->assertSame($length, $synopsis->getLength());
         $this->assertSame($value, $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}

tests/StringSynopsisTest.php

@@ -23,6 +23,6 @@ public function testProcess()
         $this->assertEquals(12, $synopsis->getLength());
         $this->assertEquals('Hello World!', $synopsis->getValue());
         $this->assertFalse($synopsis->hasChildren());
-        $this->assertNull($synopsis->getChildren());
+        $this->assertEquals([], $synopsis->getChildren());
     }
-}
+}