Add transferOwnership to MR (#425)

* Add transferOwnership to MR

* New test case

Author: adamdossa

contracts/ModuleRegistry.sol

@@ -51,6 +51,8 @@ contract ModuleRegistry is IModuleRegistry, EternalStorage {
     event ModuleVerified(address indexed _moduleFactory, bool _verified);
     // Emit when a ModuleFactory is removed by Polymath
     event ModuleRemoved(address indexed _moduleFactory, address indexed _decisionMaker);
+    // Emit when ownership gets transferred
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
 
     ///////////////
     //// Modifiers
@@ -374,6 +376,16 @@ contract ModuleRegistry is IModuleRegistry, EternalStorage {
         set(Encoder.getKey("polyToken"), IPolymathRegistry(_polymathRegistry).getAddress("PolyToken"));
     }
 
+    /**
+    * @dev Allows the current owner to transfer control of the contract to a newOwner.
+    * @param _newOwner The address to transfer ownership to.
+    */
+    function transferOwnership(address _newOwner) external onlyOwner {
+        require(_newOwner != address(0), "Invalid address");
+        emit OwnershipTransferred(owner(), _newOwner);
+        set(Encoder.getKey("owner"), _newOwner);
+    }
+
     /**
      * @notice Gets the owner of the contract
      * @return address owner

test/k_module_registry.js

@@ -479,7 +479,7 @@ contract("ModuleRegistry", accounts => {
 
                 let sto1 = (await I_MRProxied.getModulesByType.call(3))[0];
                 let sto2 = (await I_MRProxied.getModulesByType.call(3))[1];
-                let sto3 = (await I_MRProxied.getModulesByType.call(3))[2];                
+                let sto3 = (await I_MRProxied.getModulesByType.call(3))[2];
                 let sto4 = (await I_MRProxied.getModulesByType.call(3))[3];
 
                 assert.equal(sto1, I_CappedSTOFactory1.address);
@@ -542,7 +542,7 @@ contract("ModuleRegistry", accounts => {
                         I_MRProxied.reclaimERC20("0x000000000000000000000000000000000000000", { from: account_polymath })
                     );
                 });
-    
+
                 it("Should successfully reclaim POLY tokens -- not authorised", async() => {
                     catchRevert(
                         I_MRProxied.reclaimERC20(I_PolyToken.address, { from: account_temp })
@@ -592,7 +592,7 @@ contract("ModuleRegistry", accounts => {
                         I_ReclaimERC20.reclaimERC20("0x000000000000000000000000000000000000000", { from: account_polymath })
                     );
                 });
-    
+
                 it("Should successfully reclaim POLY tokens -- not authorised", async() => {
                     catchRevert(
                         I_ReclaimERC20.reclaimERC20(I_PolyToken.address, { from: account_temp })
@@ -614,7 +614,7 @@ contract("ModuleRegistry", accounts => {
             describe("Test case for the PolymathRegistry", async() => {
 
                 it("Should successfully get the address -- fail because key is not exist", async() => {
-                    catchRevert( 
+                    catchRevert(
                         I_PolymathRegistry.getAddress("PolyOracle")
                     );
                 });
@@ -624,6 +624,35 @@ contract("ModuleRegistry", accounts => {
                     assert.equal(_moduleR, I_ModuleRegistryProxy.address);
                 })
             })
+
+
+            describe("Test cases for the transferOwnership", async() => {
+
+                it("Should fail to transfer the ownership -- not authorised", async() => {
+                    catchRevert(
+                        I_MRProxied.transferOwnership(account_temp, { from: account_issuer})
+                    );
+                });
+
+                it("Should fail to transfer the ownership -- 0x address is not allowed", async() => {
+                    catchRevert(
+                        I_MRProxied.transferOwnership("0x000000000000000000000000000000000000000", { from: account_polymath})
+                    );
+                });
+
+                it("Should successfully transfer the ownership of the STR", async() => {
+                    let tx = await I_MRProxied.transferOwnership(account_temp, { from: account_polymath });
+                    assert.equal(tx.logs[0].args.previousOwner, account_polymath);
+                    assert.equal(tx.logs[0].args.newOwner, account_temp);
+                });
+
+                it("New owner has authorisation", async() => {
+                    let tx = await I_MRProxied.transferOwnership(account_polymath, { from: account_temp });
+                    assert.equal(tx.logs[0].args.previousOwner, account_temp);
+                    assert.equal(tx.logs[0].args.newOwner, account_polymath);
+                });
+
+            })
         });
     });
 });