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Fix contribute twice #8

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Fix contribute twice #8

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1 change: 1 addition & 0 deletions kickstart/ethereum/contracts/Campaign.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ contract Campaign {

function contribute() public payable {
require(msg.value > minimumContribution);
require(!approvers[msg.sender]);

approvers[msg.sender] = true;
approversCount++;
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17 changes: 17 additions & 0 deletions kickstart/test/Campaign.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,23 @@ describe('Campaigns', () => {
assert(isContributor);
});

it('restrict people to contribute once', async () => {
await campaign.methods.contribute().send({
value: '200',
from: accounts[1]
});

try {
await campaign.methods.contribute().send({
value: '200',
from: accounts[1]
});
} catch (e) {
return;
}
assert(false);
});

it('requires a minimum contribution', async () => {
try {
await campaign.methods.contribute().send({
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