Added optional precision argument to format()

Author: okdana

src/Byte/ByteFormatter.php

@@ -34,11 +34,12 @@ public function __construct(UnitDecorator $unitDecorator = null)
         ;
     }
 
-    public function format($bytes)
+    public function format($bytes, $precision = null)
     {
+        $precision = $precision === null ? $this->precision : $precision;
         $log = log($bytes, $this->base);
         $exponent = max(0, $log|0);
-        $value = round(pow($this->base, $log - $exponent), $this->precision);
+        $value = round(pow($this->base, $log - $exponent), $precision);
         $units = $this->getUnitDecorator()->decorate($exponent, $this->base, $value);
 
         return trim(sprintf($this->normalizedFormat, $value, $units));

test/Integration/ByteFormatterTest.php

@@ -77,7 +77,11 @@ public function provideDecimalIntegers()
     /** @dataProvider providePrecisionIntegers */
     public function testPrecision($integer, $formatted)
     {
-        $this->assertSame($formatted, $this->formatter->setPrecision(2)->format($integer));
+        $withArgument = $this->formatter->setPrecision(5)->format($integer, 2);
+        $withMethod = $this->formatter->setPrecision(2)->format($integer);
+
+        $this->assertSame($formatted, $withMethod);
+        $this->assertSame($withMethod, $withArgument);
     }
 
     public function providePrecisionIntegers()