Organize test files following contracts folders structure

test/ownership/Ownable.test.js

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+
+import assertRevert from '../helpers/assertRevert';
+
+var Ownable = artifacts.require('../contracts/ownership/Ownable.sol');
+
+contract('Ownable', function (accounts) {
+  let ownable;
+
+  beforeEach(async function () {
+    ownable = await Ownable.new();
+  });
+
+  it('should have an owner', async function () {
+    let owner = await ownable.owner();
+    assert.isTrue(owner !== 0);
+  });
+
+  it('changes owner after transfer', async function () {
+    let other = accounts[1];
+    await ownable.transferOwnership(other);
+    let owner = await ownable.owner();
+
+    assert.isTrue(owner === other);
+  });
+
+  it('should prevent non-owners from transfering', async function () {
+    const other = accounts[2];
+    const owner = await ownable.owner.call();
+    assert.isTrue(owner !== other);
+    await assertRevert(ownable.transferOwnership(other, { from: other }));
+  });
+
+  it('should guard ownership against stuck state', async function () {
+    let originalOwner = await ownable.owner();
+    await assertRevert(ownable.transferOwnership(null, { from: originalOwner }));
+  });
+});