114 lines
3.3 KiB
JavaScript
114 lines
3.3 KiB
JavaScript
describe('toBeCloseTo', function() {
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it('passes when within two decimal places by default', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo(),
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result;
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result = matcher.compare(0, 0);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.001);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.005);
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expect(result.pass).toBe(true);
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});
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it('fails when not within two decimal places by default', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo(),
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result;
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result = matcher.compare(0, 0.01);
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expect(result.pass).toBe(false);
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result = matcher.compare(0, 0.05);
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expect(result.pass).toBe(false);
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});
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it('accepts an optional precision argument', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo(),
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result;
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result = matcher.compare(0, 0.1, 0);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.5, 0);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.0001, 3);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.0005, 3);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.00001, 4);
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expect(result.pass).toBe(true);
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result = matcher.compare(0, 0.00005, 4);
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expect(result.pass).toBe(true);
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});
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it('fails when one of the arguments is null', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo();
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expect(function() {
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matcher.compare(null, null);
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}).toThrowError(
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'Cannot use toBeCloseTo with null. Arguments evaluated to: expect(null).toBeCloseTo(null).'
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);
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expect(function() {
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matcher.compare(0, null);
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}).toThrowError(
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'Cannot use toBeCloseTo with null. Arguments evaluated to: expect(0).toBeCloseTo(null).'
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);
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expect(function() {
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matcher.compare(null, 0);
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}).toThrowError(
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'Cannot use toBeCloseTo with null. Arguments evaluated to: expect(null).toBeCloseTo(0).'
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);
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});
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it('rounds expected values', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo(),
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result;
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result = matcher.compare(1.23, 1.229);
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expect(result.pass).toBe(true);
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result = matcher.compare(1.23, 1.226);
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expect(result.pass).toBe(true);
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result = matcher.compare(1.23, 1.225);
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expect(result.pass).toBe(true);
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result = matcher.compare(1.23, 1.235);
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expect(result.pass).toBe(true);
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// 1.2249999 will be rounded to 1.225
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result = matcher.compare(1.23, 1.2249999);
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expect(result.pass).toBe(true);
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// 1.2249999 will be rounded to 1.224
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result = matcher.compare(1.23, 1.2244999);
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expect(result.pass).toBe(false);
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result = matcher.compare(1.23, 1.234);
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expect(result.pass).toBe(true);
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});
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it('handles edge cases with rounding', function() {
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var matcher = jasmineUnderTest.matchers.toBeCloseTo(),
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result;
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// these cases resulted in false negatives in version of V8
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// included in Node.js 12 and Chrome 74 (and Edge Chromium)
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result = matcher.compare(4.030904708957288, 4.0309, 5);
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expect(result.pass).toBe(true);
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result = matcher.compare(4.82665525779431, 4.82666, 5);
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expect(result.pass).toBe(true);
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result = matcher.compare(-2.82665525779431, -2.82666, 5);
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expect(result.pass).toBe(true);
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});
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});
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