Feature/uint enumerable set tests #2253 (#2254)

* feature: setting sublevel test scenario for AddressSet

* feat: adding tests for EnumerableSet.UintSet

* feat: adding Behavior and AddressSet and UintSet tests

contracts/mocks/EnumerableSetMock.sol

@@ -4,7 +4,8 @@ pragma solidity ^0.6.0;
 
 import "../utils/EnumerableSet.sol";
 
-contract EnumerableSetMock {
+// AddressSet
+contract EnumerableAddressSetMock {
     using EnumerableSet for EnumerableSet.AddressSet;
 
     event OperationResult(bool result);
@@ -33,3 +34,34 @@ contract EnumerableSetMock {
         return _set.at(index);
     }
 }
+
+// UintSet
+contract EnumerableUintSetMock {
+    using EnumerableSet for EnumerableSet.UintSet;
+
+    event OperationResult(bool result);
+
+    EnumerableSet.UintSet private _set;
+
+    function contains(uint256 value) public view returns (bool) {
+        return _set.contains(value);
+    }
+
+    function add(uint256 value) public {
+        bool result = _set.add(value);
+        emit OperationResult(result);
+    }
+
+    function remove(uint256 value) public {
+        bool result = _set.remove(value);
+        emit OperationResult(result);
+    }
+
+    function length() public view returns (uint256) {
+        return _set.length();
+    }
+
+    function at(uint256 index) public view returns (uint256) {
+        return _set.at(index);
+    }
+}

test/utils/EnumerableSet.behavior.js

@@ -0,0 +1,116 @@
+const { expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
+const { expect } = require('chai');
+
+function shouldBehaveLikeSet (valueA, valueB, valueC) {
+  async function expectMembersMatch (set, values) {
+    await Promise.all(values.map(async value =>
+      expect(await set.contains(value)).to.equal(true)
+    ));
+
+    expect(await set.length()).to.bignumber.equal(values.length.toString());
+
+    // To compare values we convert to strings to workaround Chai
+    // limitations when dealing with nested arrays (required for BNs)
+    expect(await Promise.all([...Array(values.length).keys()].map(async (index) => {
+      const entry = await set.at(index);
+      return entry.toString();
+    }))).to.have.same.members(values.map(v => v.toString()));
+  }
+
+  it('starts empty', async function () {
+    expect(await this.set.contains(valueA)).to.equal(false);
+
+    await expectMembersMatch(this.set, []);
+  });
+
+  it('adds a value', async function () {
+    const receipt = await this.set.add(valueA);
+    expectEvent(receipt, 'OperationResult', { result: true });
+
+    await expectMembersMatch(this.set, [valueA]);
+  });
+
+  it('adds several values', async function () {
+    await this.set.add(valueA);
+    await this.set.add(valueB);
+
+    await expectMembersMatch(this.set, [valueA, valueB]);
+    expect(await this.set.contains(valueC)).to.equal(false);
+  });
+
+  it('returns false when adding values already in the set', async function () {
+    await this.set.add(valueA);
+
+    const receipt = (await this.set.add(valueA));
+    expectEvent(receipt, 'OperationResult', { result: false });
+
+    await expectMembersMatch(this.set, [valueA]);
+  });
+
+  it('reverts when retrieving non-existent elements', async function () {
+    await expectRevert(this.set.at(0), 'EnumerableSet: index out of bounds');
+  });
+
+  it('removes added values', async function () {
+    await this.set.add(valueA);
+
+    const receipt = await this.set.remove(valueA);
+    expectEvent(receipt, 'OperationResult', { result: true });
+
+    expect(await this.set.contains(valueA)).to.equal(false);
+    await expectMembersMatch(this.set, []);
+  });
+
+  it('returns false when removing values not in the set', async function () {
+    const receipt = await this.set.remove(valueA);
+    expectEvent(receipt, 'OperationResult', { result: false });
+
+    expect(await this.set.contains(valueA)).to.equal(false);
+  });
+
+  it('adds and removes multiple values', async function () {
+    // []
+
+    await this.set.add(valueA);
+    await this.set.add(valueC);
+
+    // [A, C]
+
+    await this.set.remove(valueA);
+    await this.set.remove(valueB);
+
+    // [C]
+
+    await this.set.add(valueB);
+
+    // [C, B]
+
+    await this.set.add(valueA);
+    await this.set.remove(valueC);
+
+    // [A, B]
+
+    await this.set.add(valueA);
+    await this.set.add(valueB);
+
+    // [A, B]
+
+    await this.set.add(valueC);
+    await this.set.remove(valueA);
+
+    // [B, C]
+
+    await this.set.add(valueA);
+    await this.set.remove(valueB);
+
+    // [A, C]
+
+    await expectMembersMatch(this.set, [valueA, valueC]);
+
+    expect(await this.set.contains(valueB)).to.equal(false);
+  });
+}
+
+module.exports = {
+  shouldBehaveLikeSet,
+};

test/utils/EnumerableSet.test.js

@@ -1,118 +1,33 @@
 const { accounts, contract } = require('@openzeppelin/test-environment');
-const { expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
-const { expect } = require('chai');
+const { BN } = require('@openzeppelin/test-helpers');
 
-const EnumerableSetMock = contract.fromArtifact('EnumerableSetMock');
+const EnumerableAddressSetMock = contract.fromArtifact('EnumerableAddressSetMock');
+const EnumerableUintSetMock = contract.fromArtifact('EnumerableUintSetMock');
 
-describe('EnumerableSet', function () {
-  const [ accountA, accountB, accountC ] = accounts;
-
-  beforeEach(async function () {
-    this.set = await EnumerableSetMock.new();
-  });
-
-  async function expectMembersMatch (set, values) {
-    await Promise.all(values.map(async account =>
-      expect(await set.contains(account)).to.equal(true)
-    ));
-
-    expect(await set.length()).to.bignumber.equal(values.length.toString());
-
-    expect(await Promise.all([...Array(values.length).keys()].map(index =>
-      set.at(index)
-    ))).to.have.same.members(values);
-  }
-
-  it('starts empty', async function () {
-    expect(await this.set.contains(accountA)).to.equal(false);
-
-    await expectMembersMatch(this.set, []);
-  });
-
-  it('adds a value', async function () {
-    const receipt = await this.set.add(accountA);
-    expectEvent(receipt, 'OperationResult', { result: true });
+const { shouldBehaveLikeSet } = require('./EnumerableSet.behavior');
 
-    await expectMembersMatch(this.set, [accountA]);
-  });
-
-  it('adds several values', async function () {
-    await this.set.add(accountA);
-    await this.set.add(accountB);
-
-    await expectMembersMatch(this.set, [accountA, accountB]);
-    expect(await this.set.contains(accountC)).to.equal(false);
-  });
-
-  it('returns false when adding values already in the set', async function () {
-    await this.set.add(accountA);
-
-    const receipt = (await this.set.add(accountA));
-    expectEvent(receipt, 'OperationResult', { result: false });
-
-    await expectMembersMatch(this.set, [accountA]);
-  });
-
-  it('reverts when retrieving non-existent elements', async function () {
-    await expectRevert(this.set.at(0), 'EnumerableSet: index out of bounds');
-  });
-
-  it('removes added values', async function () {
-    await this.set.add(accountA);
-
-    const receipt = await this.set.remove(accountA);
-    expectEvent(receipt, 'OperationResult', { result: true });
-
-    expect(await this.set.contains(accountA)).to.equal(false);
-    await expectMembersMatch(this.set, []);
-  });
+describe('EnumerableSet', function () {
+  // AddressSet
+  describe('EnumerableAddressSet', function () {
+    const [ accountA, accountB, accountC ] = accounts;
 
-  it('returns false when removing values not in the set', async function () {
-    const receipt = await this.set.remove(accountA);
-    expectEvent(receipt, 'OperationResult', { result: false });
+    beforeEach(async function () {
+      this.set = await EnumerableAddressSetMock.new();
+    });
 
-    expect(await this.set.contains(accountA)).to.equal(false);
+    shouldBehaveLikeSet(accountA, accountB, accountC);
   });
 
-  it('adds and removes multiple values', async function () {
-    // []
-
-    await this.set.add(accountA);
-    await this.set.add(accountC);
-
-    // [A, C]
-
-    await this.set.remove(accountA);
-    await this.set.remove(accountB);
-
-    // [C]
-
-    await this.set.add(accountB);
-
-    // [C, B]
-
-    await this.set.add(accountA);
-    await this.set.remove(accountC);
-
-    // [A, B]
-
-    await this.set.add(accountA);
-    await this.set.add(accountB);
-
-    // [A, B]
-
-    await this.set.add(accountC);
-    await this.set.remove(accountA);
-
-    // [B, C]
-
-    await this.set.add(accountA);
-    await this.set.remove(accountB);
-
-    // [A, C]
+  // UintSet
+  describe('EnumerableUintSet', function () {
+    const uintA = new BN('1234');
+    const uintB = new BN('5678');
+    const uintC = new BN('9101112');
 
-    await expectMembersMatch(this.set, [accountA, accountC]);
+    beforeEach(async function () {
+      this.set = await EnumerableUintSetMock.new();
+    });
 
-    expect(await this.set.contains(accountB)).to.equal(false);
+    shouldBehaveLikeSet(uintA, uintB, uintC);
   });
 });