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Amount: Full demurrage support.

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This commit is contained in:
Stefan Thomas
2014-01-25 11:31:56 -08:00
parent fa07601a2a
commit f678f47155
4 changed files with 202 additions and 34 deletions
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36
test/currency-test.js
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@@ -10,6 +10,9 @@ describe('Currency', function() {
it('json_rewrite("NaN") == "XRP"', function() {
assert.strictEqual('XRP', currency.json_rewrite(NaN));
});
it('json_rewrite("015841551A748AD2C1F76FF6ECB0CCCD00000000") == "XAU"', function() {
assert.strictEqual('XAU', currency.json_rewrite("015841551A748AD2C1F76FF6ECB0CCCD00000000"));
});
});
describe('from_json', function() {
it('from_json(NaN).to_json() == "XRP"', function() {
@@ -52,4 +55,37 @@ describe('Currency', function() {
assert.strictEqual('XRP', currency.from_json('XRP').to_human());
});
});
describe('has_interest', function() {
it('should be true for type 1 currency codes', function() {
assert(currency.from_hex('015841551A748AD2C1F76FF6ECB0CCCD00000000').has_interest());
assert(currency.from_json('015841551A748AD2C1F76FF6ECB0CCCD00000000').has_interest());
});
it('should be false for type 0 currency codes', function() {
assert(!currency.from_hex('0000000000000000000000005553440000000000').has_interest());
assert(!currency.from_json('USD').has_interest());
});
});
function precision(num, precision) {
return +(Math.round(num + "e+"+precision) + "e-"+precision);
}
describe('get_interest_at', function() {
it('returns demurred value for demurrage currency', function() {
var cur = currency.from_json('015841551A748AD2C1F76FF6ECB0CCCD00000000');
// At start, no demurrage should occur
assert.equal(1, cur.get_interest_at(443845330));
// After one year, 0.5% should have occurred
assert.equal(0.995, precision(cur.get_interest_at(443845330 + 31536000), 14));
// After one demurrage period, 1/e should have occurred
assert.equal(1/Math.E, cur.get_interest_at(443845330 + 6291418827.05));
// One year before start, it should be (roughly) 0.5% higher.
assert.equal(1.005, precision(cur.get_interest_at(443845330 - 31536000), 4));
// One demurrage period before start, rate should be e
assert.equal(Math.E, cur.get_interest_at(443845330 - 6291418827.05));
});
});
});