Solidity: contract calling another contract and addresses are different, why? - ethereum

Question

I have a wrapper contract that instantiates and calls another contract, and my test cases say the owners (msg.sender)s don't match. Why?
contract A
pragma solidity ^0.4.4;
contract A {
address public owner;
function A() {
owner = msg.sender;
}
function createB(string name) {
return new B(msg.sender, name);
}
}
contract B
pragma solidity ^0.4.4;
contract B {
address public owner;
string public name;
function B(address _owner, string _name) {
owner = _owner;
name = _name;
}
}
test case
pragma solidity ^0.4.0;
import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/B.sol";
contract TestB {
B testB;
A testA;
function beforeEach() {
A = A(DeployedAddresses.A());
B = testA.createB("test");
}
function testOwnerIsSet() {
Assert.equal(address(A), address(B), "Owner's address does not match");
}
}
Test Results
1) TestB testOwnerIsSet:
Error: Owner's address does not match
at /Users/xxx/.config/yarn/global/node_modules/truffle/build/cli.bundled.js:214233:17
at Array.forEach (native)
at processResult (/Users/xxx/.config/yarn/global/node_modules/truffle/build/cli.bundled.js:214231:19)
at process._tickCallback (internal/process/next_tick.js:109:7)
EDIT
I have added the address public owner to contract A. And made owner public in contract B.
And now my TestB contract looks like this:
pragma solidity ^0.4.0;
import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/B.sol";
contract TestB {
B testB;
A testA;
function beforeEach() {
A = A(DeployedAddresses.A());
B = testA.createB("test");
}
function testOwnerIsSet() {
address aOwner = A.owner();
address bOwner = B.owner();
Assert.equal(aOwner, bOwner, "Owner's address does not match");
}
}

Answer 1

Based on what you have shown I am assuming you are using truffle? And to be honest I am surprised that this compiles.
When you call,
B = testA.createB("test");
you are calling it from TestB. msg.sender will be the address of TestB.
function createB(string name) {
return new B(msg.sender, name); // msg.sender = TestB instance address
}
This may be helpful to achieve what you are attempting.