Add argument unit tests

tests/ArgumentsSaneTest.php

@@ -0,0 +1,40 @@
+<?php
+
+
+    use PHPUnit\Framework\TestCase;
+
+    class ArgumentsSaneTest extends TestCase {
+
+        public final function testIllegalArgumentExtraParam() {
+            $this->expectException(InvalidArgumentException::class);
+            $personator = new \Holtsdev\Personator\Personator('DOESNTMATTER');
+            $result = $personator->doRequest(array(\Holtsdev\Personator\Personator::VERIFY,
+                \Holtsdev\Personator\Personator::APPEND, 'Meow'), array()); // Second parameter doesn't actually matter
+
+        }
+
+        public final function testIllegalArgumentEmptyArrays() {
+            $this->expectException(InvalidArgumentException::class);
+            $personator = new \Holtsdev\Personator\Personator('DOESNTMATTER');
+            $result = $personator->doRequest(array(), array());
+        }
+
+        public final function testIllegalArgumentNull() {
+            $this->expectException(TypeError::class);
+            $personator = new \Holtsdev\Personator\Personator('DOESNTMATTER');
+            $result = $personator->doRequest(null, array());
+        }
+
+        public final function testIllegalArgumentJustWrong() {
+            $this->expectException(InvalidArgumentException::class);
+            $personator = new \Holtsdev\Personator\Personator('DOESNTMATTER');
+            $result = $personator->doRequest(array('meow'), array());
+        }
+
+        public final function testHasGoodArgumentRequestType() {
+            $personator = new \Holtsdev\Personator\Personator('DOESNTMATTER');
+            $result = $personator->doRequest(array(\Holtsdev\Personator\Personator::VERIFY, \Holtsdev\Personator\Personator::APPEND), array());
+            $this->assertEquals(1,1); // Dummy assertion, if no exception was thrown before this we know we're good.
+        }
+    }
+