Include function coverage

src/Data/ProcessedCodeCoverageDataMapper.php

@@ -19,11 +19,13 @@
 final class ProcessedCodeCoverageDataMapper
 {
     const KEY_LINE_COVERAGE = 'lineCoverage';
+    const KEY_FUNCTION_COVERAGE = 'functionCoverage';
 
     public function toJson(ProcessedCodeCoverageData $processedCodeCoverageData): string
     {
         $arrayMapping = [
             self::KEY_LINE_COVERAGE => $processedCodeCoverageData->lineCoverage(),
+            self::KEY_FUNCTION_COVERAGE => $processedCodeCoverageData->functionCoverage(),
         ];
 
         return json_encode($arrayMapping);

tests/tests/Data/ProcessedCodeCoverageDataMapperTest.php

@@ -25,6 +25,11 @@ public function testToJsonCoverageForBankAccount(): void
             $coverage->lineCoverage(),
             $decodedJson[ProcessedCodeCoverageDataMapper::KEY_LINE_COVERAGE],
         );
+
+        $this->assertEquals(
+            $coverage->functionCoverage(),
+            $decodedJson[ProcessedCodeCoverageDataMapper::KEY_FUNCTION_COVERAGE],
+        );
     }
 
     public function testFromJsonCoverageForBankAccount(): void
@@ -44,6 +49,11 @@ public function testFromJsonCoverageForBankAccount(): void
             $coverage->lineCoverage(),
             $unserializedCoverage->lineCoverage(),
         );
+
+        $this->assertEquals(
+            $coverage->functionCoverage(),
+            $unserializedCoverage->functionCoverage(),
+        );
     }
 }