feat: Increase logic on Class DnaSequence.php by length and lowercase…

src/DnaSequence.php

@@ -4,27 +4,28 @@
 
 class DnaSequence
 {
-    protected string $sequence;
+    protected string $validatedSequence;
 
     public function __construct(string $sequence)
     {
+        $sequence = trim(strtoupper($sequence));
         if (\Safe\preg_match('/^[ATGC]*$/', $sequence) === 0) {
             throw new \InvalidArgumentException('Invalid DNA sequence');
         }
-        $this->sequence = $sequence;
+        $this->validatedSequence = $sequence;
     }
 
     public function reverse(): string
     {
-        $parts = mb_str_split($this->sequence); // @phpstan-ignore-line theCodingMachineSafe.function (safe from PHP 8.0)
+        $parts = mb_str_split($this->validatedSequence); // @phpstan-ignore-line theCodingMachineSafe.function (safe from PHP 8.0)
         $reversedParts = array_reverse($parts);
 
         return implode($reversedParts);
     }
 
     public function complement(): string
     {
-        return $this->complementSequence($this->sequence);
+        return $this->complementSequence($this->validatedSequence);
     }
 
     public function reverseComplement(): string
@@ -41,4 +42,14 @@ private function complementSequence(string $sequence): string
             'C' => 'G',
         ]);
     }
+
+    public function toString(): string
+    {
+        return $this->validatedSequence;
+    }
+
+    public function length(): int
+    {
+        return strlen($this->validatedSequence);
+    }
 }

tests/DnaSequenceTest.php

@@ -38,4 +38,22 @@ public function testEmptySequence(): void
         self::assertSame('', $dnaSequence->complement());
         self::assertSame('', $dnaSequence->reverseComplement());
     }
+
+    public function testWithLowercaseLetters(): void
+    {
+        $dnaSequence = new DnaSequence('gcat');
+        self::assertSame('GCAT', $dnaSequence->toString());
+    }
+
+    public function testWithTrimmableCharacters(): void
+    {
+        $dnaSequence = new DnaSequence(' GCAT ');
+        self::assertSame('GCAT', $dnaSequence->toString());
+    }
+
+    public function testLength(): void
+    {
+        $dnaSequence = new DnaSequence(' GCAT ');
+        self::assertSame(4, $dnaSequence->length());
+    }
 }