fixed issue that happens when modifying only lines not covered by code-coverage

src/PatchCoverage.php

@@ -25,6 +25,7 @@ public function execute(string $coverageFile, string $patchFile, string $pathPre
         $result = [
             'numChangedLinesThatAreExecutable' => 0,
             'numChangedLinesThatWereExecuted'  => 0,
+            'numChangedLinesNotCovered'        => 0,
             'changedLinesThatWereNotExecuted'  => [],
         ];
 
@@ -77,6 +78,9 @@ public function execute(string $coverageFile, string $patchFile, string $pathPre
                         $result['numChangedLinesThatWereExecuted']++;
                     }
                 }
+                if (isset($coverage[$key]) && !isset($coverage[$key][$line])) {
+                    $result['numChangedLinesNotCovered']++;
+                }
             }
         }
 

src/cli/PatchCoverageCommand.php

@@ -44,7 +44,8 @@ public function run(Arguments $arguments): int
         );
 
         if ($patchCoverage['numChangedLinesThatWereExecuted'] === 0 &&
-            $patchCoverage['numChangedLinesThatAreExecutable'] === 0) {
+            $patchCoverage['numChangedLinesThatAreExecutable'] === 0 &&
+            $patchCoverage['numChangedLinesNotCovered'] === 0) {
             print 'Unable to detect executable lines that were changed.' . PHP_EOL;
 
             if ($pathPrefix === '') {

tests/end-to-end/patch-coverage/no-errors-with-only-not-covered-changed-lines.phpt

@@ -0,0 +1,20 @@
+--TEST--
+phpcov patch-coverage --path-prefix /path/prefix ../../fixture/example2/coverage/testGreetsWorld2.cov ../../fixture/example2/patch2
+--INI--
+xdebug.overload_var_dump=0
+--FILE--
+<?php declare(strict_types=1);
+require __DIR__ . '/../../../vendor/autoload.php';
+
+$_SERVER['argv'][1] = 'patch-coverage';
+$_SERVER['argv'][2] = '--path-prefix';
+$_SERVER['argv'][3] = '/tmp/tmp.eeK19HW3Mj/phpcov/';
+$_SERVER['argv'][4] = __DIR__ . '/../../fixture/example2/coverage/testGreetsWorld2.cov';
+$_SERVER['argv'][5] = __DIR__ . '/../../fixture/example2/patch2';
+
+var_dump((new SebastianBergmann\PHPCOV\Application)->run($_SERVER['argv']));
+--EXPECTF--
+phpcov %s by Sebastian Bergmann.
+
+0 / 0 changed executable lines covered ()
+int(0)

tests/fixture/example2/patch2

@@ -0,0 +1,13 @@
+diff --git a/tests/fixture/example2/src/Greeter2.php b/tests/fixture/example2/src/Greeter2.php
+index 36e0a2e..ab7b878 100644
+--- a/tests/fixture/example2/src/Greeter2.php
++++ b/tests/fixture/example2/src/Greeter2.php
+@@ -4,7 +4,7 @@
+
+ final class Greeter2
+ {
+-    public const GREETING='Hello world!';
++    public const GREETING='Hello wonderful world!';
+
+     public function greetWorld(): string
+     {

tests/fixture/example2/phpunit.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         bootstrap="src/autoload.php"
+         failOnRisky="true"
+         failOnWarning="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <coverage>
+        <include>
+            <directory>src</directory>
+        </include>
+    </coverage>
+</phpunit>

tests/fixture/example2/src/Greeter2.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace fixture\example2\src;
+
+final class Greeter2
+{
+    public const GREETING='Hello world!';
+
+    public function greetWorld(): string
+    {
+        return self::GREETING;
+    }
+}

tests/fixture/example2/src/autoload.php

@@ -0,0 +1,4 @@
+<?php declare(strict_types=1);
+
+require __DIR__ . '/Greeter2.php';
+

tests/fixture/example2/tests/Greeter2Test.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace fixture\example2\tests;
+
+use fixture\example2\src\Greeter2;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \fixture\example2\src\Greeter2
+ */
+final class Greeter2Test extends TestCase
+{
+    public function testGreetsWorld(): void
+    {
+        $this->assertSame(Greeter2::GREETING, (new Greeter2())->greetWorld());
+    }
+}