CaIon
d0bd8aac74
Bound user-supplied count/duration parameters at request validation, route ratio multipliers through guarded setters, and use saturating int conversions in all quota math paths.
23 lines
809 B
Go
23 lines
809 B
Go
package common
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import (
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"math"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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// TestQuotaFromFloat guards the billing invariant that oversized quota
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// products (e.g. price multiplied by a huge user-supplied count) saturate
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// instead of wrapping into a negative charge (credit).
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func TestQuotaFromFloat(t *testing.T) {
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assert.Equal(t, 42, QuotaFromFloat(42.4))
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assert.Equal(t, -42, QuotaFromFloat(-42.4))
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// 2000 quota per call * n=18446744073686646784 overflows int64.
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assert.Equal(t, math.MaxInt32, QuotaFromFloat(2000*1.8446744073686647e19))
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assert.Equal(t, math.MinInt32, QuotaFromFloat(-2000*1.8446744073686647e19))
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assert.Equal(t, math.MaxInt32, QuotaFromFloat(math.Inf(1)))
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assert.Equal(t, math.MinInt32, QuotaFromFloat(math.Inf(-1)))
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assert.Equal(t, 0, QuotaFromFloat(math.NaN()))
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}
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