diff --git a/phpstan.neon b/phpstan.neon
index 4319fff..0eeead5 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -7,3 +7,5 @@ parameters:
         - *DEPRECATED_*
     parallel:
         maximumNumberOfProcesses: 4
+    stubFiles:
+        - stubs/Psr/Cache/CacheItemInterface.stub
diff --git a/src/CurrencyAverageRates/Infrastructure/Collection/RatesFlatCollection.php b/src/CurrencyAverageRates/Infrastructure/Collection/RatesFlatCollection.php
index 046fc11..acad80d 100644
--- a/src/CurrencyAverageRates/Infrastructure/Collection/RatesFlatCollection.php
+++ b/src/CurrencyAverageRates/Infrastructure/Collection/RatesFlatCollection.php
@@ -8,6 +8,7 @@
 use MaciejSz\Nbp\CurrencyAverageRates\Domain\CurrencyAveragesTable;
 
 /**
+ * @implements \IteratorAggregate<int, CurrencyAverageRate>
  * @internal
  */
 final class RatesFlatCollection implements \IteratorAggregate
diff --git a/src/CurrencyAverageRates/Infrastructure/Collection/TablesDictionary.php b/src/CurrencyAverageRates/Infrastructure/Collection/TablesDictionary.php
index 634e24f..0b1ae8a 100644
--- a/src/CurrencyAverageRates/Infrastructure/Collection/TablesDictionary.php
+++ b/src/CurrencyAverageRates/Infrastructure/Collection/TablesDictionary.php
@@ -12,9 +12,12 @@
  */
 final class TablesDictionary
 {
-    /** @var array<string, CurrencyAveragesTable> */
+    /** @var array<string, ?CurrencyAveragesTable> */
     private $tables;
 
+    /**
+     * @param array<string, ?CurrencyAveragesTable> $tables
+     */
     public function __construct(array $tables)
     {
         $this->tables = $tables;
diff --git a/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAverageRatesMapper.php b/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAverageRatesMapper.php
index 876b5b5..94ae740 100644
--- a/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAverageRatesMapper.php
+++ b/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAverageRatesMapper.php
@@ -15,7 +15,7 @@ class CurrencyAverageRatesMapper
     private $rateValidator;
 
     /**
-     * @param ThrowableValidator<mixed>|null $rateValidator
+     * @param ?ThrowableValidator<mixed> $rateValidator
      */
     public function __construct(?ThrowableValidator $rateValidator = null)
     {
diff --git a/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAveragesTableMapper.php b/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAveragesTableMapper.php
index 0c7e1dc..2af9359 100644
--- a/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAveragesTableMapper.php
+++ b/src/CurrencyAverageRates/Infrastructure/Mapper/CurrencyAveragesTableMapper.php
@@ -33,6 +33,7 @@ public function rawDataToDomainObject(array $tableData): CurrencyAveragesTable
         $tableLetter = $dataAccess->extractString('table');
         $tableNumber = $dataAccess->extractString('no');
         $effectiveDate = $dataAccess->extractDateTime('effectiveDate');
+        /** @var array<array{currency: string, code: string, mid: float}> $rates */
         $rates = $dataAccess->extractArray('rates');
 
         return new CurrencyAveragesTable(
diff --git a/src/CurrencyTradingRates/Infrastructure/Collection/RatesFlatCollection.php b/src/CurrencyTradingRates/Infrastructure/Collection/RatesFlatCollection.php
index af1e031..6721159 100644
--- a/src/CurrencyTradingRates/Infrastructure/Collection/RatesFlatCollection.php
+++ b/src/CurrencyTradingRates/Infrastructure/Collection/RatesFlatCollection.php
@@ -8,6 +8,7 @@
 use MaciejSz\Nbp\CurrencyTradingRates\Domain\CurrencyTradingTable;
 
 /**
+ * @implements \IteratorAggregate<int, CurrencyTradingRate>
  * @internal
  */
 final class RatesFlatCollection implements \IteratorAggregate
diff --git a/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingRatesMapper.php b/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingRatesMapper.php
index 1754d64..2a0e049 100644
--- a/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingRatesMapper.php
+++ b/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingRatesMapper.php
@@ -15,7 +15,7 @@ class CurrencyTradingRatesMapper
     private $rateValidator;
 
     /**
-     * @param ThrowableValidator<mixed>|null $rateValidator
+     * @param ?ThrowableValidator<mixed> $rateValidator
      */
     public function __construct(?ThrowableValidator $rateValidator = null)
     {
@@ -26,15 +26,28 @@ public function __construct(?ThrowableValidator $rateValidator = null)
     }
 
     /**
-     * @param array<mixed> $tableData
-     * @param array<array<mixed>> $ratesData
+     * @param array{
+     *     table: string,
+     *     no: string,
+     *     tradingDate: string,
+     *     effectiveDate: string,
+     *     rates: array<mixed>,
+     * } $tableData
+     * @param array<
+     *     array{
+     *         currency: string,
+     *         code: string,
+     *         bid: float,
+     *         ask: float,
+     *     }
+     * > $rates
      * @return array<CurrencyTradingRate>
      */
-    public function rawDataToDomainObjectCollection(array $tableData, array $ratesData): array
+    public function rawDataToDomainObjectCollection(array $tableData, array $rates): array
     {
         $collection = [];
-        foreach ($ratesData as $rateData) {
-            $currencyTradingRate = $this->rawDataToDomainObject($tableData, $rateData);
+        foreach ($rates as $rate) {
+            $currencyTradingRate = $this->rawDataToDomainObject($tableData, $rate);
             $collection[$currencyTradingRate->getCurrencyCode()] = $currencyTradingRate;
         }
 
@@ -42,8 +55,19 @@ public function rawDataToDomainObjectCollection(array $tableData, array $ratesDa
     }
 
     /**
-     * @param array<mixed> $tableData
-     * @param array<mixed> $ratesData
+     * @param array{
+     *     table: string,
+     *     no: string,
+     *     tradingDate: string,
+     *     effectiveDate: string,
+     *     rates: array<mixed>,
+     * } $tableData
+     * @param array{
+     *     currency: string,
+     *     code: string,
+     *     bid: float,
+     *     ask: float,
+     * } $ratesData
      */
     public function rawDataToDomainObject(array $tableData, array $ratesData): CurrencyTradingRate
     {
diff --git a/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingTableMapper.php b/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingTableMapper.php
index 8a2aa35..9a43bd9 100644
--- a/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingTableMapper.php
+++ b/src/CurrencyTradingRates/Infrastructure/Mapper/CurrencyTradingTableMapper.php
@@ -25,7 +25,13 @@ public function __construct(?CurrencyTradingRatesMapper $ratesMapper = null)
     }
 
     /**
-     * @param array<mixed> $tableData
+     * @param array{
+     *     table: string,
+     *     no: string,
+     *     tradingDate: string,
+     *     effectiveDate: string,
+     *     rates: array<mixed>,
+     * } $tableData
      */
     public function rawDataToDomainObject(array $tableData): CurrencyTradingTable
     {
@@ -35,6 +41,16 @@ public function rawDataToDomainObject(array $tableData): CurrencyTradingTable
         $tableNumber = $dataAccess->extractString('no');
         $tradingDate = $dataAccess->extractDateTime('tradingDate');
         $effectiveDate = $dataAccess->extractDateTime('effectiveDate');
+        /**
+         * @var array<
+         *     array{
+         *         currency: string,
+         *         code: string,
+         *         bid: float,
+         *         ask: float,
+         *     }
+         * > $rates
+         */
         $rates = $dataAccess->extractArray('rates');
 
         return new CurrencyTradingTable(
diff --git a/src/GoldRates/Infrastructure/Collection/GoldRatesCollection.php b/src/GoldRates/Infrastructure/Collection/GoldRatesCollection.php
index 4fd3ba9..f744ef1 100644
--- a/src/GoldRates/Infrastructure/Collection/GoldRatesCollection.php
+++ b/src/GoldRates/Infrastructure/Collection/GoldRatesCollection.php
@@ -6,6 +6,9 @@
 
 use MaciejSz\Nbp\GoldRates\Domain\GoldRate;
 
+/**
+ * @implements \IteratorAggregate<int, GoldRate>
+ */
 class GoldRatesCollection implements \IteratorAggregate
 {
     /** @var iterable<GoldRate> */
diff --git a/src/GoldRates/Infrastructure/Mapper/GoldRatesMapper.php b/src/GoldRates/Infrastructure/Mapper/GoldRatesMapper.php
index 148e2db..8534fdc 100644
--- a/src/GoldRates/Infrastructure/Mapper/GoldRatesMapper.php
+++ b/src/GoldRates/Infrastructure/Mapper/GoldRatesMapper.php
@@ -11,7 +11,7 @@
 use MaciejSz\Nbp\Shared\Infrastructure\Validator\ThrowableValidator;
 
 /**
- * @implements TableMapper<array<GoldRate>>
+ * @implements TableMapper<GoldRate>
  */
 class GoldRatesMapper implements TableMapper
 {
@@ -19,7 +19,7 @@ class GoldRatesMapper implements TableMapper
     private $rateValidator;
 
     /**
-     * @param ThrowableValidator<mixed>|null $rateValidator
+     * @param ?ThrowableValidator<mixed> $rateValidator
      */
     public function __construct(?ThrowableValidator $rateValidator = null)
     {
diff --git a/src/Shared/Domain/DateFormatter/functions.php b/src/Shared/Domain/DateFormatter/functions.php
index 6d5e150..ddf213b 100644
--- a/src/Shared/Domain/DateFormatter/functions.php
+++ b/src/Shared/Domain/DateFormatter/functions.php
@@ -8,12 +8,22 @@
 
 function first_day_of_month(int $year, int $month): string
 {
-    return date('Y-m-d', strtotime("{$year}-{$month}-01"));
+    return date('Y-m-d', safe_strtotime("{$year}-{$month}-01"));
 }
 
 function last_day_of_month(int $year, int $month): string
 {
-    return date('Y-m-t', strtotime("{$year}-{$month}"));
+    return date('Y-m-t', safe_strtotime("{$year}-{$month}"));
+}
+
+function safe_strtotime(string $datetime): int
+{
+    $result = strtotime($datetime);
+    if (false === $result) {
+        throw new InvalidDateException("Cannot convert string to time");
+    }
+
+    return $result;
 }
 
 /**
@@ -91,7 +101,10 @@ function next_month($date): \DateTimeInterface
     return middle_of_month($date)->add(new \DateInterval('P1M'));
 }
 
-function middle_of_month($date): \DateTimeInterface
+/**
+ * @param string|\DateTimeInterface $date
+ */
+function middle_of_month($date): \DateTimeImmutable
 {
     return new \DateTimeImmutable(ensure_date_obj($date)->format('Y-m-') . '15');
 }
diff --git a/src/Shared/Domain/DateTimeBuilder.php b/src/Shared/Domain/DateTimeBuilder.php
index 4642b7d..be119b8 100644
--- a/src/Shared/Domain/DateTimeBuilder.php
+++ b/src/Shared/Domain/DateTimeBuilder.php
@@ -12,9 +12,12 @@ class DateTimeBuilder
 
     /** @var string */
     private $timezone;
-    /** @var Validator<string>|null */
+    /** @var ?Validator<string> */
     private $validator;
 
+    /**
+     * @param ?Validator<string> $validator
+     */
     public function __construct(
         string $timezone = self::DEFAULT_TIMEZONE,
         ?Validator $validator = null
@@ -23,7 +26,7 @@ public function __construct(
         $this->validator = $validator;
     }
 
-    public function build(?string $date = null): \DateTimeInterface
+    public function build(string $date): \DateTimeInterface
     {
         if ($this->validator) {
             $this->validator->validate($date);
diff --git a/src/Shared/Infrastructure/Client/NbpClient.php b/src/Shared/Infrastructure/Client/NbpClient.php
index 789e3d5..8c09832 100644
--- a/src/Shared/Infrastructure/Client/NbpClient.php
+++ b/src/Shared/Infrastructure/Client/NbpClient.php
@@ -9,7 +9,7 @@
 interface NbpClient
 {
     /**
-     * @return array<mixed>
+     * @return array<array<mixed>>
      */
     public function send(NbpClientRequest $request): array;
 }
diff --git a/src/Shared/Infrastructure/Mapper/TableMapper.php b/src/Shared/Infrastructure/Mapper/TableMapper.php
index c087258..acb984e 100644
--- a/src/Shared/Infrastructure/Mapper/TableMapper.php
+++ b/src/Shared/Infrastructure/Mapper/TableMapper.php
@@ -13,5 +13,5 @@ interface TableMapper
      * @param array<mixed> $tableData
      * @return T
      */
-    public function rawDataToDomainObject(array $tableData): object;
+    public function rawDataToDomainObject(array $tableData);
 }
diff --git a/src/Shared/Infrastructure/Repository/NbpWebRepository.php b/src/Shared/Infrastructure/Repository/NbpWebRepository.php
index ec20d71..59ce436 100644
--- a/src/Shared/Infrastructure/Repository/NbpWebRepository.php
+++ b/src/Shared/Infrastructure/Repository/NbpWebRepository.php
@@ -102,9 +102,10 @@ public function getGoldRates(int $year, int $month): iterable
     }
 
     /**
+     * @template T
      * @param iterable<array<mixed>> $results
-     * @param TableMapper $mapper
-     * @return iterable
+     * @param TableMapper<T> $mapper
+     * @return iterable<T>
      */
     private function hydrate(iterable $results, TableMapper $mapper): iterable
     {
diff --git a/src/Shared/Infrastructure/Serializer/ArrayDataAccess.php b/src/Shared/Infrastructure/Serializer/ArrayDataAccess.php
index 1fe2a2c..8cdd43b 100644
--- a/src/Shared/Infrastructure/Serializer/ArrayDataAccess.php
+++ b/src/Shared/Infrastructure/Serializer/ArrayDataAccess.php
@@ -8,11 +8,14 @@
 
 class ArrayDataAccess implements DataAccess
 {
-    /** @var array */
+    /** @var array<mixed> */
     private $data;
-    /** @var DateTimeBuilder|null */
+    /** @var ?DateTimeBuilder */
     private $dateTimeBuilder = null;
 
+    /**
+     * @param array<mixed> $data
+     */
     public function __construct(array $data)
     {
         $this->data = $data;
@@ -65,6 +68,9 @@ public function extractFloat(string $key): float
     public function extractDateTime(string $key): \DateTimeInterface
     {
         $value = $this->extract($key);
+        if (!is_string($value)) {
+            throw new Exception\UnexpectedDataType('valid date', gettype($value));
+        }
         try {
             return $this->getDateTimeBuilder()->build($value);
         } catch (\Exception $e) {
diff --git a/src/Shared/Infrastructure/Serializer/DataAccess.php b/src/Shared/Infrastructure/Serializer/DataAccess.php
index ade4bc6..3b256f0 100644
--- a/src/Shared/Infrastructure/Serializer/DataAccess.php
+++ b/src/Shared/Infrastructure/Serializer/DataAccess.php
@@ -6,6 +6,9 @@
 
 interface DataAccess
 {
+    /**
+     * @return mixed
+     */
     public function extract(string $key);
 
     /**
@@ -25,6 +28,7 @@ public function extractDateTime(string $key): \DateTimeInterface;
 
     /**
      * @throws Exception\UnexpectedDataType
+     * @return array<mixed>
      */
     public function extractArray(string $key): array;
 }
diff --git a/src/Shared/Infrastructure/Serializer/Exception/DataKeyDoesNotExist.php b/src/Shared/Infrastructure/Serializer/Exception/DataKeyDoesNotExist.php
index bdc75fb..30043ad 100644
--- a/src/Shared/Infrastructure/Serializer/Exception/DataKeyDoesNotExist.php
+++ b/src/Shared/Infrastructure/Serializer/Exception/DataKeyDoesNotExist.php
@@ -6,7 +6,7 @@
 
 class DataKeyDoesNotExist extends \RuntimeException
 {
-    public function __construct($key = '', $code = 0, \Throwable $previous = null)
+    public function __construct(string $key = '', int $code = 0, \Throwable $previous = null)
     {
         parent::__construct("Data key '{$key}' does not exist", $code, $previous);
     }
diff --git a/src/Shared/Infrastructure/Transport/CachingTransport.php b/src/Shared/Infrastructure/Transport/CachingTransport.php
index 2851b37..eae8257 100644
--- a/src/Shared/Infrastructure/Transport/CachingTransport.php
+++ b/src/Shared/Infrastructure/Transport/CachingTransport.php
@@ -4,6 +4,7 @@
 
 namespace MaciejSz\Nbp\Shared\Infrastructure\Transport;
 
+use Psr\Cache\CacheItemInterface;
 use Psr\Cache\CacheItemPoolInterface;
 
 class CachingTransport implements Transport
@@ -29,6 +30,7 @@ public function __construct(
 
     public function get(string $path): array
     {
+        /** @var CacheItemInterface<array<array<mixed>>> $item */
         $item = $this->cache->getItem($path);
         if (!$item->isHit()) {
             $item->set($this->backend->get($path));
diff --git a/src/Shared/Infrastructure/Transport/FileContentsTransport.php b/src/Shared/Infrastructure/Transport/FileContentsTransport.php
index 669890a..9c19ff3 100644
--- a/src/Shared/Infrastructure/Transport/FileContentsTransport.php
+++ b/src/Shared/Infrastructure/Transport/FileContentsTransport.php
@@ -23,7 +23,10 @@ public function get(string $path): array
         $path = trim($path, '/');
         $uri = "{$baseUri}/{$path}?format=json";
         $contents = file_get_contents($uri);
-        /** @var array<mixed>|null $data */
+        if (false === $contents) {
+            throw new TransportException("Cannot get contents from {$uri}");
+        }
+        /** @var ?array<array<mixed>> $data */
         $data = json_decode($contents, true);
         if (null === $data) {
             throw new TransportException("Cannot decode JSON data from {$uri}");
diff --git a/src/Shared/Infrastructure/Transport/GuzzleTransport.php b/src/Shared/Infrastructure/Transport/GuzzleTransport.php
index 579093a..af00a67 100644
--- a/src/Shared/Infrastructure/Transport/GuzzleTransport.php
+++ b/src/Shared/Infrastructure/Transport/GuzzleTransport.php
@@ -33,7 +33,7 @@ public function get(string $path): array
             ],
         ]);
 
-        /** @var array<mixed>|null $data */
+        /** @var ?array<array<mixed>> $data */
         $data = json_decode($response->getBody()->getContents(), true);
         if (null === $data) {
             /** @var Uri $uri */
diff --git a/src/Shared/Infrastructure/Transport/Transport.php b/src/Shared/Infrastructure/Transport/Transport.php
index 683e4f9..bf0ed64 100644
--- a/src/Shared/Infrastructure/Transport/Transport.php
+++ b/src/Shared/Infrastructure/Transport/Transport.php
@@ -7,7 +7,7 @@
 interface Transport
 {
     /**
-     * @return array<mixed>
+     * @return array<array<mixed>>
      */
     public function get(string $path): array;
 }
diff --git a/src/Shared/Infrastructure/Validator/NbpNumericRateValidator.php b/src/Shared/Infrastructure/Validator/NbpNumericRateValidator.php
index 4204703..2376d0b 100644
--- a/src/Shared/Infrastructure/Validator/NbpNumericRateValidator.php
+++ b/src/Shared/Infrastructure/Validator/NbpNumericRateValidator.php
@@ -19,7 +19,8 @@ public function isValid($value): bool
     public function validate($value): void
     {
         if (!$this->isValid($value)) {
-            throw new ValidationException("Invalid numeric rate value: '{$value}'");
+            $stringRepresentation = (is_string($value) || is_numeric($value))? $value : 'value';
+            throw new ValidationException("Invalid numeric rate value: '{$stringRepresentation}'");
         }
     }
 }
diff --git a/stubs/Psr/Cache/CacheItemInterface.stub b/stubs/Psr/Cache/CacheItemInterface.stub
new file mode 100644
index 0000000..72e4a65
--- /dev/null
+++ b/stubs/Psr/Cache/CacheItemInterface.stub
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Psr\Cache;
+
+/**
+ * @template T
+ */
+interface CacheItemInterface
+{
+    /**
+     * @return T
+     */
+    public function get();
+
+    /**
+     * @param T $value
+     * @return $this
+     */
+    public function set($value): self;
+}
diff --git a/tests/integration/FileContentsTransportTest.php b/tests/integration/FileContentsTransportTest.php
index cae71dc..b0fb198 100644
--- a/tests/integration/FileContentsTransportTest.php
+++ b/tests/integration/FileContentsTransportTest.php
@@ -5,6 +5,9 @@
 namespace MaciejSz\Nbp\Test\Integration;
 
 use donatj\MockWebServer\MockWebServer;
+use donatj\MockWebServer\Response;
+use donatj\MockWebServer\ResponseInterface;
+use donatj\MockWebServer\Responses\NotFoundResponse;
 use MaciejSz\Nbp\Shared\Infrastructure\Transport\FileContentsTransport;
 use MaciejSz\Nbp\Test\Fixtures\WebServer\MockWebServerFactory;
 use PHPUnit\Framework\TestCase;
diff --git a/tests/unit/GoldRates/Infrastructure/Mapper/GoldRatesMapperTest.php b/tests/unit/GoldRates/Infrastructure/Mapper/GoldRatesMapperTest.php
index 4a41970..51ce41f 100644
--- a/tests/unit/GoldRates/Infrastructure/Mapper/GoldRatesMapperTest.php
+++ b/tests/unit/GoldRates/Infrastructure/Mapper/GoldRatesMapperTest.php
@@ -40,14 +40,13 @@ public function validate($value): void
     }
 
     /**
-     * @return array<
-     *     array{data: string, cena: float}
-     * >
+     * @return array<array{data: string, cena: float}>
      */
     private function fetchFixtureTables(): array
     {
         $fixturesRepository = new FixturesRepository();
 
-        return $fixturesRepository->fetchArray('/api/cenyzlota/2023-03-01/2023-03-03/data');
+        // @phpstan-ignore-next-line
+        return $fixturesRepository->fetchArray('/api/cenyzlota/2023-03-01/2023-03-03/data');;
     }
 }
diff --git a/tests/unit/Shared/Domain/DateBuilderTest.php b/tests/unit/Shared/Domain/DateBuilderTest.php
index ee5b4b4..c01a260 100644
--- a/tests/unit/Shared/Domain/DateBuilderTest.php
+++ b/tests/unit/Shared/Domain/DateBuilderTest.php
@@ -10,7 +10,7 @@
 
 class DateBuilderTest extends TestCase
 {
-    public function testBuild()
+    public function testBuild(): void
     {
         $validator = $this->createMock(Validator::class);
         $validator->method('validate');
@@ -21,7 +21,7 @@ public function testBuild()
         $this->assertEquals('2023-01-01T00:00:00+01:00', $date->format('c'));
     }
 
-    public function testBuildInvalid()
+    public function testBuildInvalid(): void
     {
         $validator = $this->createMock(Validator::class);
         $exception = new \Exception('Invalid date');
diff --git a/tests/unit/Shared/Domain/DateFormatterTest.php b/tests/unit/Shared/Domain/DateFormatterTest.php
index bd983f2..5ca03e2 100644
--- a/tests/unit/Shared/Domain/DateFormatterTest.php
+++ b/tests/unit/Shared/Domain/DateFormatterTest.php
@@ -73,7 +73,7 @@ public function testIsSameDay($date1, $date2, bool $expected): void
         self::assertSame($expected, is_same_day($date1, $date2));
     }
 
-    public function testCompareDays()
+    public function testCompareDays(): void
     {
         self::assertSame(-1, compare_days('2020-01-01', '2020-01-02'));
         self::assertSame(0, compare_days('2020-01-01', '2020-01-01'));
diff --git a/tests/unit/Shared/Infrastructure/Transport/FileContentsTransportTest.php b/tests/unit/Shared/Infrastructure/Transport/FileContentsTransportTest.php
index 2829c21..7689a63 100644
--- a/tests/unit/Shared/Infrastructure/Transport/FileContentsTransportTest.php
+++ b/tests/unit/Shared/Infrastructure/Transport/FileContentsTransportTest.php
@@ -33,4 +33,22 @@ public function testGetInvalidJson(): void
         $transport = new FileContentsTransport('/');
         $transport->get($path);
     }
+
+    public function testGetInvalidPath(): void
+    {
+        self::expectException(TransportException::class);
+        self::expectExceptionMessage("Cannot get contents from /bogus");
+
+        $transport = new FileContentsTransport('/');
+
+        set_error_handler(
+            function (int $errno, string $errstr, string $errfile, int $errline): bool {
+                return true;
+            }
+        );
+
+        $transport->get('bogus');
+
+        restore_error_handler();
+    }
 }