diff --git a/LICENSE b/LICENSE
old mode 100755
new mode 100644
diff --git a/README.md b/README.md
old mode 100755
new mode 100644
diff --git a/composer.json b/composer.json
old mode 100755
new mode 100644
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
old mode 100755
new mode 100644
diff --git a/tests/Tests/Exception/ChainExceptionTest.php b/tests/Tests/Exception/ChainExceptionTest.php
index 4bdac4a..6bdc182 100644
--- a/tests/Tests/Exception/ChainExceptionTest.php
+++ b/tests/Tests/Exception/ChainExceptionTest.php
@@ -36,7 +36,7 @@ class ChainExceptionTest extends TestCase
      */
     private $exception2;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->exception1 = new \Exception('Something bad happened.');
         $this->exception2 = new \Exception('General exception.');
diff --git a/tests/Tests/Integration/ExchangerTest.php b/tests/Tests/Integration/ExchangerTest.php
index 9ec3762..d74c99c 100644
--- a/tests/Tests/Integration/ExchangerTest.php
+++ b/tests/Tests/Integration/ExchangerTest.php
@@ -27,7 +27,7 @@ class ExchangerTest extends TestCase
 {
     private $fixerAccessKey;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->fixerAccessKey = getenv('FIXER_ACCESS_KEY');
     }
@@ -65,8 +65,8 @@ private function cacheTest(callable $provideQuery)
         $thirdEnd = microtime(true) - $thirdStart;
 
         $this->assertEquals($firstRate, $secondRate, $thirdRate);
-        $this->assertTrue($secondEnd < (100 * $firstEnd));
-        $this->assertTrue($thirdEnd < (100 * $firstEnd));
+        $this->assertLessThan(100 * $firstEnd, $secondEnd);
+        $this->assertLessThan(100 * $firstEnd, $thirdEnd);
     }
 
     /**
diff --git a/tests/Tests/Service/CurrencyDataFeedTest.php b/tests/Tests/Service/CurrencyDataFeedTest.php
index fe17105..a70f54b 100644
--- a/tests/Tests/Service/CurrencyDataFeedTest.php
+++ b/tests/Tests/Service/CurrencyDataFeedTest.php
@@ -58,7 +58,7 @@ public function it_fetches_a_rate()
         $rate = $service->getExchangeRate(new ExchangeRateQuery($pair));
 
         $this->assertSame(1.18765, $rate->getValue());
-        $this->assertTrue('2017-12-21' == $rate->getDate()->format('Y-m-d'));
+        $this->assertEquals('2017-12-21', $rate->getDate()->format('Y-m-d'));
         $this->assertEquals('currency_data_feed', $rate->getProviderName());
         $this->assertSame($pair, $rate->getCurrencyPair());
     }
diff --git a/tests/Tests/Service/ForgeTest.php b/tests/Tests/Service/ForgeTest.php
index 3743395..ce055b9 100644
--- a/tests/Tests/Service/ForgeTest.php
+++ b/tests/Tests/Service/ForgeTest.php
@@ -58,7 +58,7 @@ public function it_fetches_a_rate()
         $rate = $service->getExchangeRate(new ExchangeRateQuery($pair));
 
         $this->assertSame(1.18711, $rate->getValue());
-        $this->assertTrue('2017-12-21' == $rate->getDate()->format('Y-m-d'));
+        $this->assertEquals('2017-12-21', $rate->getDate()->format('Y-m-d'));
         $this->assertEquals('forge', $rate->getProviderName());
         $this->assertSame($pair, $rate->getCurrencyPair());
     }
@@ -75,7 +75,7 @@ public function it_fetches_a_rate_when_response_symbol_matches()
 
         $rate = $service->getExchangeRate(new ExchangeRateQuery($pair));
         $this->assertSame(9.12721, $rate->getValue());
-        $this->assertTrue('2018-05-30' == $rate->getDate()->format('Y-m-d'));
+        $this->assertEquals('2018-05-30', $rate->getDate()->format('Y-m-d'));
         $this->assertEquals('forge', $rate->getProviderName());
         $this->assertSame($pair, $rate->getCurrencyPair());
     }