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test: add tests for Scale constructor and properties
PR-URL: #11205 Co-authored-by: Athan Reines <kgryte@gmail.com> Reviewed-by: Athan Reines <kgryte@gmail.com>
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‎lib/node_modules/@stdlib/plot/vega/scale/base/ctor/test/test.domain.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var tape = require( 'tape' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var isUndefined = require( '@stdlib/assert/is-undefined' );
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var hasProp = require( '@stdlib/assert/has-property' );
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var isCollection = require( '@stdlib/assert/is-collection' );
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var Scale = require( './../lib' );
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// TESTS //
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tape( 'main export is a function', function test( t ) {
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t.ok( true, __filename );
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t.strictEqual( typeof Scale, 'function', 'main export is a function' );
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t.end();
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});
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tape( 'the constructor returns an instance which has a `domain` property', function test( t ) {
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var v;
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v = new Scale({
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'name': 'xScale'
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});
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t.strictEqual( hasOwnProp( v, 'domain' ), false, 'returns expected value' );
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t.strictEqual( hasProp( v, 'domain' ), true, 'returns expected value' );
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t.strictEqual( isUndefined( v.domain ), true, 'returns expected value' );
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v = new Scale({
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'name': 'xScale',
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'domain': [ 0, 10 ]
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});
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t.strictEqual( isCollection( v.domain ), true, 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance having a `domain` property which throws an error if set to an invalid value', function test( t ) {
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var values;
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var i;
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var v;
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v = new Scale({
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'name': 'xScale'
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});
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values = [
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'5',
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5,
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NaN,
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true,
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false,
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function noop() {}
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];
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for ( i = 0; i < values.length; i++ ) {
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t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
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}
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t.end();
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function badValue( value ) {
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return function badValue() {
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v.domain = value;
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};
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}
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});
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tape( 'the constructor returns an instance having a `domain` property', function test( t ) {
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var scale;
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scale = new Scale({
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'name': 'xScale'
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});
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t.strictEqual( isUndefined( scale.domain ), true, 'returns expected value' );
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scale = new Scale({
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'name': 'xScale',
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'domain': [ 0, 10 ]
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});
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t.deepEqual( scale.domain, [ 0, 10 ], 'returns expected value' );
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scale = new Scale({
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'name': 'xScale',
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'domain': [ 0, 20 ]
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});
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t.deepEqual( scale.domain, [ 0, 20 ], 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance having a `domain` property which can be set to a valid value', function test( t ) {
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var scale;
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scale = new Scale({
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'name': 'xScale'
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});
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scale.domain = [ 0, 10 ];
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t.deepEqual( scale.domain, [ 0, 10 ], 'returns expected value' );
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scale.domain = [ 0, 20 ];
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t.deepEqual( scale.domain, [ 0, 20 ], 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance which emits an event when the `domain` property is set to a new value', function test( t ) {
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var scale;
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var count;
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scale = new Scale({
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'name': 'xScale'
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});
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count = 0;
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scale.on( 'change', onChange );
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scale.domain = [ 0, 10 ];
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t.strictEqual( count, 1, 'returns expected value' );
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scale.domain = [ 0, 20 ];
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t.strictEqual( count, 2, 'returns expected value' );
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// Setting to the same value should not emit an event:
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scale.domain = [ 0, 20 ];
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t.strictEqual( count, 2, 'returns expected value' );
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t.end();
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function onChange() {
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count += 1;
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}
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});

‎lib/node_modules/@stdlib/plot/vega/scale/base/ctor/test/test.domain_max.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var tape = require( 'tape' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var isUndefined = require( '@stdlib/assert/is-undefined' );
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var hasProp = require( '@stdlib/assert/has-property' );
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var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
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var Scale = require( './../lib' );
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// TESTS //
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tape( 'main export is a function', function test( t ) {
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t.ok( true, __filename );
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t.strictEqual( typeof Scale, 'function', 'main export is a function' );
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t.end();
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});
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tape( 'the constructor returns an instance which has a `domainMax` property', function test( t ) {
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var v;
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v = new Scale({
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'name': 'xScale'
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});
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t.strictEqual( hasOwnProp( v, 'domainMax' ), false, 'returns expected value' );
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t.strictEqual( hasProp( v, 'domainMax' ), true, 'returns expected value' );
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t.strictEqual( isUndefined( v.domainMax ), true, 'returns expected value' );
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v = new Scale({
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'name': 'xScale',
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'domainMax': 10
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});
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t.strictEqual( isNumber( v.domainMax ), true, 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance having a `domainMax` property which throws an error if set to an invalid value', function test( t ) {
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var values;
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var i;
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var v;
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v = new Scale({
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'name': 'xScale'
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});
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values = [
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'5',
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null,
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true,
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false,
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[],
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{},
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function noop() {}
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];
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for ( i = 0; i < values.length; i++ ) {
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t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
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}
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t.end();
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function badValue( value ) {
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return function badValue() {
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v.domainMax = value;
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};
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}
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});
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tape( 'the constructor returns an instance having a `domainMax` property', function test( t ) {
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var scale;
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scale = new Scale({
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'name': 'xScale'
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});
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t.strictEqual( isUndefined( scale.domainMax ), true, 'returns expected value' );
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scale = new Scale({
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'name': 'xScale',
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'domainMax': 10
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});
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t.strictEqual( scale.domainMax, 10, 'returns expected value' );
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scale = new Scale({
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'name': 'xScale',
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'domainMax': 20
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});
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t.strictEqual( scale.domainMax, 20, 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance having a `domainMax` property which can be set to a valid value', function test( t ) {
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var scale;
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scale = new Scale({
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'name': 'xScale'
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});
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scale.domainMax = 10;
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t.strictEqual( scale.domainMax, 10, 'returns expected value' );
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scale.domainMax = 20;
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t.strictEqual( scale.domainMax, 20, 'returns expected value' );
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t.end();
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});
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tape( 'the constructor returns an instance which emits an event when the `domainMax` property is set to a new value', function test( t ) {
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var scale;
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var count;
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scale = new Scale({
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'name': 'xScale'
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});
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count = 0;
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scale.on( 'change', onChange );
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scale.domainMax = 10;
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t.strictEqual( count, 1, 'returns expected value' );
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scale.domainMax = 20;
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t.strictEqual( count, 2, 'returns expected value' );
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// Setting to the same value should not emit an event:
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scale.domainMax = 20;
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t.strictEqual( count, 2, 'returns expected value' );
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t.end();
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function onChange() {
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count += 1;
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}
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});

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