add instance

src/entity/SourceFile.php

@@ -118,6 +118,14 @@ public function getCoverages()
         return $this->coverages;
     }
 
+    /**
+     * @return CoverageCollection
+     */
+    public function getEmptyCoverages()
+    {
+        return $this->coverages->newInstance();
+    }
+
     /**
      * @param CoverageInterface $coverage
      * @throws \coverallskit\exception\LineOutOfRangeException

src/entity/collection/CoverageCollection.php

@@ -112,6 +112,22 @@ public function at($lineAt)
         return $coverage->get();
     }
 
+    /**
+     * @return int
+     */
+    public function getLastLineNumber()
+    {
+        return $this->lineRange->getLastLineNumber();
+    }
+
+    /**
+     * @return CoverageCollection
+     */
+    public function newInstance()
+    {
+        return new self($this->getLastLineNumber());
+    }
+
     /**
      * @return bool
      */