diff --git a/infection.json5 b/infection.json5
index 2e2680d..36a0cf5 100644
--- a/infection.json5
+++ b/infection.json5
@@ -29,12 +29,19 @@
                 "Fidry\\CpuCoreCounter\\Executor\\ProcOpenExecutor::execute"
             ]
         },
+        "Continue_": false,
         "FunctionCallRemoval": {
             "ignore": [
                 // I can't find a case in practice where this would happen
-                "Fidry\\CpuCoreCounter\\Executor\\ProcOpenExecutor::execute",
+                "Fidry\\CpuCoreCounter\\Executor\\ProcOpenExecutor::execute"
             ]
         },
-        "PublicVisibility": false
+        "PublicVisibility": false,
+        "TrueValue": {
+            "ignore": [
+                // This is a case where the value does not matter
+                "Fidry\\CpuCoreCounter\\Finder\\LscpuPhysicalFinder::countCpuCores"
+            ]
+        }
     }
 }
diff --git a/src/Finder/FinderRegistry.php b/src/Finder/FinderRegistry.php
index 7cb2607..4f82458 100644
--- a/src/Finder/FinderRegistry.php
+++ b/src/Finder/FinderRegistry.php
@@ -54,8 +54,8 @@ public static function getDefaultLogicalFinders(): array
             new HwLogicalFinder(),
             new _NProcessorFinder(),
             new NProcessorFinder(),
-            new CpuInfoFinder(),
             new LscpuLogicalFinder(),
+            new CpuInfoFinder(),
         ];
     }
 
diff --git a/src/Finder/LscpuLogicalFinder.php b/src/Finder/LscpuLogicalFinder.php
index da81a15..bce09eb 100644
--- a/src/Finder/LscpuLogicalFinder.php
+++ b/src/Finder/LscpuLogicalFinder.php
@@ -13,6 +13,12 @@
 
 namespace Fidry\CpuCoreCounter\Finder;
 
+use function count;
+use function explode;
+use function is_array;
+use function preg_grep;
+use const PHP_EOL;
+
 /**
  * The number of logical cores.
  *
@@ -25,13 +31,12 @@ public function getCommand(): string
         return 'lscpu -p';
     }
 
-    protected function countCpuCores(string $lscpu): ?int
+    protected function countCpuCores(string $process): ?int
     {
-        $lines = explode(PHP_EOL, $lscpu);
-
-        $actualLines = preg_grep('/^[0-9]+\,/', $lines);
+        $lines = explode(PHP_EOL, $process);
+        $actualLines = preg_grep('/^\d+,/', $lines);
 
-        if (false === $actualLines) {
+        if (!is_array($actualLines)) {
             return null;
         }
 
diff --git a/src/Finder/LscpuPhysicalFinder.php b/src/Finder/LscpuPhysicalFinder.php
index 95abc7a..58523ce 100644
--- a/src/Finder/LscpuPhysicalFinder.php
+++ b/src/Finder/LscpuPhysicalFinder.php
@@ -13,6 +13,13 @@
 
 namespace Fidry\CpuCoreCounter\Finder;
 
+use function count;
+use function explode;
+use function is_array;
+use function preg_grep;
+use function strtok;
+use const PHP_EOL;
+
 /**
  * The number of physical processors.
  *
@@ -30,13 +37,12 @@ public function getCommand(): string
         return 'lscpu -p';
     }
 
-    protected function countCpuCores(string $lscpu): ?int
+    protected function countCpuCores(string $process): ?int
     {
-        $lines = explode(PHP_EOL, $lscpu);
-
-        $actualLines = preg_grep('/^[0-9]+\,/', $lines);
+        $lines = explode(PHP_EOL, $process);
+        $actualLines = preg_grep('/^\d+/', $lines);
 
-        if (false === $actualLines) {
+        if (!is_array($actualLines)) {
             return null;
         }
 
@@ -51,7 +57,6 @@ protected function countCpuCores(string $lscpu): ?int
 
             $cores[$core] = true;
         }
-
         unset($cores['-']);
 
         $count = count($cores);
diff --git a/tests/Finder/LscpuLogicalFinderTest.php b/tests/Finder/LscpuLogicalFinderTest.php
index fe9cbaa..57179c4 100644
--- a/tests/Finder/LscpuLogicalFinderTest.php
+++ b/tests/Finder/LscpuLogicalFinderTest.php
@@ -13,68 +13,84 @@
 
 namespace Fidry\CpuCoreCounter\Test\Finder;
 
-use Fidry\CpuCoreCounter\Finder\CpuCoreFinder;
+use Fidry\CpuCoreCounter\Executor\ProcessExecutor;
 use Fidry\CpuCoreCounter\Finder\LscpuLogicalFinder;
-use Fidry\CpuCoreCounter\Test\Executor\DummyExecutor;
-use PHPUnit\Framework\TestCase;
+use Fidry\CpuCoreCounter\Finder\ProcOpenBasedFinder;
 
 /**
  * @covers \Fidry\CpuCoreCounter\Finder\LscpuLogicalFinder
  *
  * @internal
  */
-final class LscpuLogicalFinderTest extends TestCase
+final class LscpuLogicalFinderTest extends ProcOpenBasedFinderTestCase
 {
-    /**
-     * @var DummyExecutor
-     */
-    protected $executor;
-
-    protected function setUp(): void
+    public static function processResultProvider(): iterable
     {
-        $this->executor = new DummyExecutor();
-    }
+        yield 'command could not be executed' => [
+            null,
+            null,
+        ];
 
-    protected function tearDown(): void
-    {
-        unset($this->executor);
-    }
+        yield 'empty stdout & stderr' => [
+            ['', ''],
+            null,
+        ];
 
-    /**
-     * @dataProvider finderProvider
-     */
-    public function test_it_can_describe_itself(CpuCoreFinder $finder, string $expected): void
-    {
-        $actual = $finder->toString();
+        yield 'whitespace stdout' => [
+            [' ', ''],
+            null,
+        ];
 
-        self::assertSame($expected, $actual);
-    }
+        yield 'whitespace stderr' => [
+            ['', ' '],
+            null,
+        ];
 
-    public static function finderProvider(): iterable
-    {
-        yield [
-            new LscpuLogicalFinder(),
-            FinderShortClassName::get(new LscpuLogicalFinder())
+        yield 'whitespace stdout & stderr' => [
+            [' ', ' '],
+            null,
         ];
-    }
 
-    /**
-     * @dataProvider lscpuProvider
-     */
-    public function test_it_can_count_the_number_of_cpu_cores(
-        ?array $processResult,
-        ?int $expected
-    ): void {
-        $finder = new LscpuLogicalFinder($this->executor);
-        $this->executor->setOutput($processResult);
+        yield 'linux line return for stdout' => [
+            ["\n", ''],
+            null,
+        ];
 
-        $actual = $finder->find();
+        yield 'linux line return for stderr' => [
+            ['', "\n"],
+            null,
+        ];
 
-        self::assertSame($expected, $actual);
-    }
+        yield 'linux line return for stdout & stderr' => [
+            ["\n", "\n"],
+            null,
+        ];
+
+        yield 'windows line return for stdout' => [
+            ["\r\n", ''],
+            null,
+        ];
+
+        yield 'windows line return for stderr' => [
+            ['', "\r\n"],
+            null,
+        ];
+
+        yield 'windows line return for stdout & stderr' => [
+            ["\r\n", "\r\n"],
+            null,
+        ];
+
+        yield 'no processor' => [
+            ['0', ''],
+            null,
+        ];
+
+        yield 'valid result with stderr' => [
+            ['3', 'something'],
+            null,
+        ];
 
-    public static function lscpuProvider(): iterable
-    {
         yield 'example with four logical but two physical' => [
             [
                 <<<'EOF'
@@ -122,4 +138,9 @@ public static function lscpuProvider(): iterable
             null
         ];
     }
+
+    protected function createFinder(ProcessExecutor $executor): ProcOpenBasedFinder
+    {
+        return new LscpuLogicalFinder($executor);
+    }
 }
diff --git a/tests/Finder/LscpuPhysicalFinderTest.php b/tests/Finder/LscpuPhysicalFinderTest.php
index e0ffa47..2a57b96 100644
--- a/tests/Finder/LscpuPhysicalFinderTest.php
+++ b/tests/Finder/LscpuPhysicalFinderTest.php
@@ -13,68 +13,84 @@
 
 namespace Fidry\CpuCoreCounter\Test\Finder;
 
-use Fidry\CpuCoreCounter\Finder\CpuCoreFinder;
+use Fidry\CpuCoreCounter\Executor\ProcessExecutor;
 use Fidry\CpuCoreCounter\Finder\LscpuPhysicalFinder;
-use Fidry\CpuCoreCounter\Test\Executor\DummyExecutor;
-use PHPUnit\Framework\TestCase;
+use Fidry\CpuCoreCounter\Finder\ProcOpenBasedFinder;
 
 /**
  * @covers \Fidry\CpuCoreCounter\Finder\LscpuPhysicalFinder
  *
  * @internal
  */
-final class LscpuPhysicalFinderTest extends TestCase
+final class LscpuPhysicalFinderTest extends ProcOpenBasedFinderTestCase
 {
-    /**
-     * @var DummyExecutor
-     */
-    protected $executor;
-
-    protected function setUp(): void
+    public static function processResultProvider(): iterable
     {
-        $this->executor = new DummyExecutor();
-    }
+        yield 'command could not be executed' => [
+            null,
+            null,
+        ];
 
-    protected function tearDown(): void
-    {
-        unset($this->executor);
-    }
+        yield 'empty stdout & stderr' => [
+            ['', ''],
+            null,
+        ];
 
-    /**
-     * @dataProvider finderProvider
-     */
-    public function test_it_can_describe_itself(CpuCoreFinder $finder, string $expected): void
-    {
-        $actual = $finder->toString();
+        yield 'whitespace stdout' => [
+            [' ', ''],
+            null,
+        ];
 
-        self::assertSame($expected, $actual);
-    }
+        yield 'whitespace stderr' => [
+            ['', ' '],
+            null,
+        ];
 
-    public static function finderProvider(): iterable
-    {
-        yield [
-            new LscpuPhysicalFinder(),
-            FinderShortClassName::get(new LscpuPhysicalFinder())
+        yield 'whitespace stdout & stderr' => [
+            [' ', ' '],
+            null,
         ];
-    }
 
-    /**
-     * @dataProvider lscpuProvider
-     */
-    public function test_it_can_count_the_number_of_cpu_cores(
-        ?array $processResult,
-        ?int $expected
-    ): void {
-        $finder = new LscpuPhysicalFinder($this->executor);
-        $this->executor->setOutput($processResult);
+        yield 'linux line return for stdout' => [
+            ["\n", ''],
+            null,
+        ];
 
-        $actual = $finder->find();
+        yield 'linux line return for stderr' => [
+            ['', "\n"],
+            null,
+        ];
 
-        self::assertSame($expected, $actual);
-    }
+        yield 'linux line return for stdout & stderr' => [
+            ["\n", "\n"],
+            null,
+        ];
+
+        yield 'windows line return for stdout' => [
+            ["\r\n", ''],
+            null,
+        ];
+
+        yield 'windows line return for stderr' => [
+            ['', "\r\n"],
+            null,
+        ];
+
+        yield 'windows line return for stdout & stderr' => [
+            ["\r\n", "\r\n"],
+            null,
+        ];
+
+        yield 'no processor' => [
+            ['0', ''],
+            null,
+        ];
+
+        yield 'valid result with stderr' => [
+            ['3', 'something'],
+            null,
+        ];
 
-    public static function lscpuProvider(): iterable
-    {
         yield 'example with four logical but two physical' => [
             [
                 <<<'EOF'
@@ -139,4 +155,9 @@ public static function lscpuProvider(): iterable
             null
         ];
     }
+
+    protected function createFinder(ProcessExecutor $executor): ProcOpenBasedFinder
+    {
+        return new LscpuPhysicalFinder($executor);
+    }
 }