Organize test files following contracts folders structure

test/token/StandardToken.test.js

@@ -0,0 +1,103 @@
+
+import assertRevert from '../helpers/assertRevert';
+
+var StandardTokenMock = artifacts.require('mocks/StandardTokenMock.sol');
+
+contract('StandardToken', function (accounts) {
+  let token;
+
+  beforeEach(async function () {
+    token = await StandardTokenMock.new(accounts[0], 100);
+  });
+
+  it('should return the correct totalSupply after construction', async function () {
+    let totalSupply = await token.totalSupply();
+
+    assert.equal(totalSupply, 100);
+  });
+
+  it('should return the correct allowance amount after approval', async function () {
+    let token = await StandardTokenMock.new();
+    await token.approve(accounts[1], 100);
+    let allowance = await token.allowance(accounts[0], accounts[1]);
+
+    assert.equal(allowance, 100);
+  });
+
+  it('should return correct balances after transfer', async function () {
+    let token = await StandardTokenMock.new(accounts[0], 100);
+    await token.transfer(accounts[1], 100);
+    let balance0 = await token.balanceOf(accounts[0]);
+    assert.equal(balance0, 0);
+
+    let balance1 = await token.balanceOf(accounts[1]);
+    assert.equal(balance1, 100);
+  });
+
+  it('should throw an error when trying to transfer more than balance', async function () {
+    let token = await StandardTokenMock.new(accounts[0], 100);
+    await assertRevert(token.transfer(accounts[1], 101));
+  });
+
+  it('should return correct balances after transfering from another account', async function () {
+    let token = await StandardTokenMock.new(accounts[0], 100);
+    await token.approve(accounts[1], 100);
+    await token.transferFrom(accounts[0], accounts[2], 100, { from: accounts[1] });
+
+    let balance0 = await token.balanceOf(accounts[0]);
+    assert.equal(balance0, 0);
+
+    let balance1 = await token.balanceOf(accounts[2]);
+    assert.equal(balance1, 100);
+
+    let balance2 = await token.balanceOf(accounts[1]);
+    assert.equal(balance2, 0);
+  });
+
+  it('should throw an error when trying to transfer more than allowed', async function () {
+    await token.approve(accounts[1], 99);
+    await assertRevert(token.transferFrom(accounts[0], accounts[2], 100, { from: accounts[1] }));
+  });
+
+  it('should throw an error when trying to transferFrom more than _from has', async function () {
+    let balance0 = await token.balanceOf(accounts[0]);
+    await token.approve(accounts[1], 99);
+    await assertRevert(token.transferFrom(accounts[0], accounts[2], balance0 + 1, { from: accounts[1] }));
+  });
+
+  describe('validating allowance updates to spender', function () {
+    let preApproved;
+
+    it('should start with zero', async function () {
+      preApproved = await token.allowance(accounts[0], accounts[1]);
+      assert.equal(preApproved, 0);
+    });
+
+    it('should increase by 50 then decrease by 10', async function () {
+      await token.increaseApproval(accounts[1], 50);
+      let postIncrease = await token.allowance(accounts[0], accounts[1]);
+      preApproved.plus(50).should.be.bignumber.equal(postIncrease);
+      await token.decreaseApproval(accounts[1], 10);
+      let postDecrease = await token.allowance(accounts[0], accounts[1]);
+      postIncrease.minus(10).should.be.bignumber.equal(postDecrease);
+    });
+  });
+
+  it('should increase by 50 then set to 0 when decreasing by more than 50', async function () {
+    await token.approve(accounts[1], 50);
+    await token.decreaseApproval(accounts[1], 60);
+    let postDecrease = await token.allowance(accounts[0], accounts[1]);
+    postDecrease.should.be.bignumber.equal(0);
+  });
+
+  it('should throw an error when trying to transfer to 0x0', async function () {
+    let token = await StandardTokenMock.new(accounts[0], 100);
+    await assertRevert(token.transfer(0x0, 100));
+  });
+
+  it('should throw an error when trying to transferFrom to 0x0', async function () {
+    let token = await StandardTokenMock.new(accounts[0], 100);
+    await token.approve(accounts[1], 100);
+    await assertRevert(token.transferFrom(accounts[0], 0x0, 100, { from: accounts[1] }));
+  });
+});