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99 lines
3.1 KiB
TypeScript
99 lines
3.1 KiB
TypeScript
/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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import {
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rebaseToPercentChange,
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rebaseSeriesData,
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snapToNearestX,
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} from '../../src/Timeseries/percentChange';
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test('rebases each column to percent change from its first value', () => {
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const rebased = rebaseToPercentChange(
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[
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{ __timestamp: 1, a: 100, b: 50 },
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{ __timestamp: 2, a: 150, b: 25 },
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{ __timestamp: 3, a: 200, b: null },
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],
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'__timestamp',
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);
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expect(rebased).toEqual([
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{ __timestamp: 1, a: 0, b: 0 },
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{ __timestamp: 2, a: 0.5, b: -0.5 },
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{ __timestamp: 3, a: 1, b: null },
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]);
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});
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test('skips leading nulls when picking the baseline', () => {
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const rebased = rebaseToPercentChange(
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[
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{ __timestamp: 1, a: null },
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{ __timestamp: 2, a: 40 },
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{ __timestamp: 3, a: 60 },
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],
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'__timestamp',
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);
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expect(rebased[1].a).toBe(0);
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expect(rebased[2].a).toBeCloseTo(0.5);
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});
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test('yields nulls when the baseline is zero', () => {
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const rebased = rebaseToPercentChange(
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[
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{ __timestamp: 1, a: 0 },
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{ __timestamp: 2, a: 10 },
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],
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'__timestamp',
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);
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expect(rebased.map(r => r.a)).toEqual([null, null]);
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});
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test('re-indexing displayed data matches rebasing raw data to that point', () => {
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// raw 100, 150, 200 rebased to first point: 0, 0.5, 1
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const displayed: [number, number][] = [
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[1, 0],
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[2, 0.5],
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[3, 1],
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];
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// re-index to x=2 (raw 150): 100/150-1, 0, 200/150-1
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const reindexed = rebaseSeriesData(displayed, 2);
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expect(reindexed[0][1]).toBeCloseTo(100 / 150 - 1);
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expect(reindexed[1][1]).toBeCloseTo(0);
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expect(reindexed[2][1]).toBeCloseTo(200 / 150 - 1);
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});
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test('re-indexing to the current baseline is a no-op', () => {
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const displayed: [number, number][] = [
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[1, 0],
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[2, 0.5],
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];
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expect(rebaseSeriesData(displayed, 1)).toEqual(displayed);
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});
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test('snaps to the nearest available x', () => {
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expect(snapToNearestX([10, 20, 30], 24)).toBe(20);
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expect(snapToNearestX([10, 20, 30], 26)).toBe(30);
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expect(snapToNearestX([], 5)).toBeUndefined();
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});
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test('validates a category-axis x instead of coercing it to a number', () => {
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// category axes report their exact (already-snapped) value on drag
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expect(snapToNearestX(['a', 'b', 'c'], 'b')).toBe('b');
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// a pixel that landed outside the axis falls back to the first category
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expect(snapToNearestX(['a', 'b', 'c'], 'unknown')).toBe('a');
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});
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