63 lines
2.2 KiB
JavaScript
Executable file
63 lines
2.2 KiB
JavaScript
Executable file
/* eslint-disable no-shadow */
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var test = require('tap').test;
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var dimensions = 2;
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var createSpringForce = require('../lib/codeGenerators/generateCreateSpringForce')(dimensions);
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var Body = require('../lib/codeGenerators/generateCreateBody')(dimensions);
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var Spring = require('../lib/spring');
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var random = require('ngraph.random')(42);
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test('Initialized with default value', function (t) {
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t.throws(() => createSpringForce());
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t.end();
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});
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test('Should bump bodies at same position', function (t) {
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var body1 = new Body(0, 0);
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var body2 = new Body(0, 0);
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// length between two bodies is 2, while ideal length is 1. Each body
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// should start moving towards each other after force update
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var idealLength = 1;
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var spring = new Spring(body1, body2, idealLength);
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var springForce = createSpringForce({springCoefficient: 0.1, springLength: 1}, random);
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springForce.update(spring);
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t.ok(body1.force.x > 0, 'Body 1 should go right');
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t.ok(body2.force.x < 0, 'Body 2 should go left');
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t.end();
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});
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test('Check spring force direction', function (t) {
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var springForce = createSpringForce({springCoefficient: 0.1, springLength: 1});
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t.test('Should contract two bodies when ideal length is smaller than actual', function (t) {
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var body1 = new Body(-1, 0);
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var body2 = new Body(+1, 0);
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// length between two bodies is 2, while ideal length is 1. Each body
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// should start moving towards each other after force update
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var idealLength = 1;
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var spring = new Spring(body1, body2, idealLength);
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springForce.update(spring);
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t.ok(body1.force.x > 0, 'Body 1 should go right');
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t.ok(body2.force.x < 0, 'Body 2 should go left');
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t.end();
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});
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t.test('Should repel two bodies when ideal length is larger than actual', function (t) {
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var body1 = new Body(-1, 0);
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var body2 = new Body(+1, 0);
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// length between two bodies is 2, while ideal length is 1. Each body
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// should start moving towards each other after force update
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var idealLength = 3;
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var spring = new Spring(body1, body2, idealLength);
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springForce.update(spring);
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t.ok(body1.force.x < 0, 'Body 1 should go left');
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t.ok(body2.force.x > 0, 'Body 2 should go right');
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t.end();
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});
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t.end();
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});
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