diff --git a/tests/printf_test.aer b/tests/printf_test.aer
new file mode 100644
index 0000000..500cab9
--- /dev/null
+++ b/tests/printf_test.aer
@@ -0,0 +1,40 @@
+class Main {
+	private $s = 'monkey';
+	private $t = 'many monkeys';
+	private $n =  43951789;
+	private $u = -43951789;
+	private $c = 65;
+
+	public function __construct() {
+		$this->testMonkey();
+		$this->testNumbers();
+	}
+
+	private function testMonkey() {
+		printf("[%s]\n", $this->s);
+		printf("[%10s]\n", $this->s);
+		printf("[%-10s]\n", $this->s);
+		printf("[%010s]\n", $this->s);
+		printf("[%'#10s]\n", $this->s);
+		printf("[%10.10s]\n", $this->t);
+	}
+
+	private function testNumbers() {
+		printf("%%b = '%b'\n", $this->n);
+		printf("%%c = '%c'\n", $this->c);
+		printf("%%d = '%d'\n", $this->n);
+		printf("%%e = '%e'\n", $this->n);
+		printf("%%u = '%u'\n", $this->n);
+		printf("%%u = '%u'\n", $this->u);
+		printf("%%f = '%f'\n", $this->n);
+		printf("%%o = '%o'\n", $this->n);
+		printf("%%s = '%s'\n", $this->n);
+		printf("%%x = '%x'\n", $this->n);
+		printf("%%X = '%X'\n", $this->n);
+		printf("%%+d = '%+d'\n", $this->n);
+		printf("%%+d = '%+d'\n", $this->u);
+	}
+
+}
+
+new Main();
\ No newline at end of file
diff --git a/tests/printf_test.exp b/tests/printf_test.exp
new file mode 100644
index 0000000..a1d8c18
--- /dev/null
+++ b/tests/printf_test.exp
@@ -0,0 +1,19 @@
+[monkey]
+[    monkey]
+[monkey    ]
+[0000monkey]
+[####monkey]
+[many monke]
+%b = '10100111101010011010101101'
+%c = 'A'
+%d = '43951789'
+%e = '4.395179e+07'
+%u = '43951789'
+%u = '43951789'
+%f = '43951789.000000'
+%o = '247523255'
+%s = '43951789'
+%x = '29ea6ad'
+%X = '29EA6AD'
+%+d = '+43951789'
+%+d = '-43951789'
diff --git a/tests/type_juggle.aer b/tests/type_juggle.aer
new file mode 100644
index 0000000..0acbbbd
--- /dev/null
+++ b/tests/type_juggle.aer
@@ -0,0 +1,27 @@
+class Main {
+
+	function __construct() {
+		$foo = '0';
+		var_dump($foo);
+		$foo += 2;
+		var_dump($foo);
+		$foo = 1;
+		var_dump($foo);
+		$foo += 1.3;
+		var_dump($foo);
+		$foo = 5 + "10 Little Piggies";
+		var_dump($foo);
+		$foo = 5 + 10;
+		var_dump($foo);
+		$foo = 'car';
+		$foo[0] = 'b';
+		var_dump($foo);
+		$foo = 10;
+		$foo = (bool) $foo;
+		var_dump($foo);
+		$foo = '';
+		var_dump($foo);
+	}
+}
+
+new Main();
diff --git a/tests/type_juggle.exp b/tests/type_juggle.exp
new file mode 100644
index 0000000..42e6c4b
--- /dev/null
+++ b/tests/type_juggle.exp
@@ -0,0 +1,9 @@
+string(1 '0')
+string(2 '02')
+int(1)
+float(2.3)
+string(18 '510 Little Piggies')
+int(15)
+string(3 'bar')
+bool(TRUE)
+string(0 '')