Migrate security/initializable (#592)

* update cairo

* fix path

* add security mod

* add initializable

* add tests

* Update src/openzeppelin/security/initializable.cairo

Co-authored-by: Martín Triay <martriay@gmail.com>

* remove underscore

* add internal macros

---------

Co-authored-by: Martín Triay <martriay@gmail.com>

Makefile

@@ -12,7 +12,7 @@ build:
 	cargo build
 
 test:
-	cargo run --bin cairo-test -- --starknet --path src/openzeppelin
+	cargo run --bin cairo-test -- --starknet --path $(SOURCE_FOLDER)
 
 format:
 	cargo run --bin cairo-format -- --recursive $(SOURCE_FOLDER) --print-parsing-errors

src/openzeppelin/lib.cairo

@@ -1,2 +1,3 @@
+mod security;
 mod token;
 mod tests;

src/openzeppelin/security.cairo

@@ -0,0 +1 @@
+mod initializable;

src/openzeppelin/security/initializable.cairo

@@ -0,0 +1,17 @@
+#[contract]
+mod Initializable {
+    struct Storage {
+        initialized: bool,
+    }
+
+    #[internal]
+    fn is_initialized() -> bool {
+        initialized::read()
+    }
+
+    #[internal]
+    fn initialize() {
+        assert(!is_initialized(), 'Contract already initialized');
+        initialized::write(true);
+    }
+}

src/openzeppelin/tests.cairo

@@ -1 +1,2 @@
 mod test_erc20;
+mod test_initializable;

src/openzeppelin/tests/test_initializable.cairo

@@ -0,0 +1,17 @@
+use openzeppelin::security::initializable::Initializable;
+
+#[test]
+#[available_gas(2000000)]
+fn test_initialize() {
+    assert(!Initializable::is_initialized(),'Should not be initialized');
+    Initializable::initialize();
+    assert(Initializable::is_initialized(),'Should be initialized');
+}
+
+#[test]
+#[available_gas(2000000)]
+#[should_panic(expected = ('Contract already initialized', ))]
+fn test_initialize_when_initialized() {
+    Initializable::initialize();
+    Initializable::initialize();
+}