Add method to check if a email exists

src/GhostZero/BitinflowAccounts/Traits/UsersTrait.php

@@ -32,4 +32,18 @@ trait UsersTrait
     {
         return $this->post('v2/users', $parameters);
     }
-}
+
+    /**
+     * Checks if the given email exists.
+     *
+     * @param string $email
+     *
+     * @return Result
+     */
+    public function isEmailExisting(string $email): Result
+    {
+        return $this->post('v2/users/check-email', [
+            'email' => $email,
+        ]);
+    }
+}

tests/GhostZero/BitinflowAccounts/ApiUsersTest.php

@@ -22,6 +22,20 @@ class ApiUsersTest extends ApiTestCase
         $this->assertEquals('rene@preuss.io', $result->data()->email);
     }
 
+    public function testEmailAvailabilityNonExisting(): void
+    {
+        $this->getClient()->withToken($this->getToken());
+        $this->registerResult($result = $this->getClient()->isEmailExisting('rene+non-existing@preuss.io'));
+        $this->assertTrue(!$result->success());
+    }
+
+    public function testEmailAvailabilityExisting(): void
+    {
+        $this->getClient()->withToken($this->getToken());
+        $this->registerResult($result = $this->getClient()->isEmailExisting('rene@preuss.io'));
+        $this->assertTrue($result->success());
+    }
+
     public function testCreateUser(): void
     {
         $testEmailAddress = $this->createRandomEmail();
@@ -47,4 +61,4 @@ class ApiUsersTest extends ApiTestCase
     {
         return sprintf('rene+unittest.%s@bitinflow.com', Str::random());
     }
-}
+}