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import { expect } from '../setup'
/* Imports: Internal */
import { expectApprox } from '../../src'
import { assert } from 'chai'
describe('expectApprox', () => {
it('should pass when the actual number is higher, but within the expected range of the target', async () => {
expectApprox(119, 100, {
percentUpperDeviation: 20,
percentLowerDeviation: 20,
absoluteUpperDeviation: 20,
absoluteLowerDeviation: 20,
})
})
it('should pass when the actual number is lower, but within the expected range of the target', async () => {
expectApprox(81, 100, {
percentUpperDeviation: 20,
percentLowerDeviation: 20,
absoluteUpperDeviation: 20,
absoluteLowerDeviation: 20,
})
})
it('should throw an error when no deviation values are given', async () => {
try {
expectApprox(101, 100, {})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Must define at least one parameter to limit the deviation of the actual value.'
)
}
})
describe('should throw an error if the actual value is higher than expected', () => {
describe('... when only one upper bound value is defined', () => {
it('... and percentUpperDeviation sets the upper bound', async () => {
try {
expectApprox(121, 100, {
percentUpperDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (121) is greater than the calculated upper bound of (120): expected false to be true'
)
}
})
it('... and absoluteUpperDeviation sets the upper bound', async () => {
try {
expectApprox(121, 100, {
absoluteUpperDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (121) is greater than the calculated upper bound of (120): expected false to be true'
)
}
})
})
describe('... when both values are defined', () => {
it('... and percentUpperDeviation sets the upper bound', async () => {
try {
expectApprox(121, 100, {
percentUpperDeviation: 20,
absoluteUpperDeviation: 30,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (121) is greater than the calculated upper bound of (120): expected false to be true'
)
}
})
it('... and absoluteUpperDeviation sets the upper bound', async () => {
try {
expectApprox(121, 100, {
percentUpperDeviation: 30,
absoluteUpperDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (121) is greater than the calculated upper bound of (120): expected false to be true'
)
}
})
})
})
describe('should throw an error if the actual value is lower than expected', () => {
describe('... when only one lower bound value is defined', () => {
it('... and percentLowerDeviation sets the lower bound', async () => {
try {
expectApprox(79, 100, {
percentLowerDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (79) is less than the calculated lower bound of (80): expected false to be true'
)
}
})
it('... and absoluteLowerDeviation sets the lower bound', async () => {
try {
expectApprox(79, 100, {
absoluteLowerDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (79) is less than the calculated lower bound of (80): expected false to be true'
)
}
})
})
describe('... when both values are defined', () => {
it('... and percentLowerDeviation sets the lower bound', async () => {
try {
expectApprox(79, 100, {
percentLowerDeviation: 20,
absoluteLowerDeviation: 30,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (79) is less than the calculated lower bound of (80): expected false to be true'
)
}
})
it('... and absoluteLowerDeviation sets the lower bound', async () => {
try {
expectApprox(79, 100, {
percentLowerDeviation: 30,
absoluteLowerDeviation: 20,
})
assert.fail('expectApprox did not throw an error')
} catch (error) {
expect(error.message).to.equal(
'Actual value (79) is less than the calculated lower bound of (80): expected false to be true'
)
}
})
})
})
})