test: add tests for Scale constructor and properties

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

@@ -0,0 +1,152 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var isCollection = require( '@stdlib/assert/is-collection' );
+var Scale = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof Scale, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the constructor returns an instance which has a `domain` property', function test( t ) {
+	var v;
+
+	v = new Scale({
+		'name': 'xScale'
+	});
+	t.strictEqual( hasOwnProp( v, 'domain' ), false, 'returns expected value' );
+	t.strictEqual( hasProp( v, 'domain' ), true, 'returns expected value' );
+	t.strictEqual( isUndefined( v.domain ), true, 'returns expected value' );
+
+	v = new Scale({
+		'name': 'xScale',
+		'domain': [ 0, 10 ]
+	});
+	t.strictEqual( isCollection( v.domain ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `domain` property which throws an error if set to an invalid value', function test( t ) {
+	var values;
+	var i;
+	var v;
+
+	v = new Scale({
+		'name': 'xScale'
+	});
+
+	values = [
+		'5',
+		5,
+		NaN,
+		true,
+		false,
+		function noop() {}
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			v.domain = value;
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `domain` property', function test( t ) {
+	var scale;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+	t.strictEqual( isUndefined( scale.domain ), true, 'returns expected value' );
+
+	scale = new Scale({
+		'name': 'xScale',
+		'domain': [ 0, 10 ]
+	});
+	t.deepEqual( scale.domain, [ 0, 10 ], 'returns expected value' );
+
+	scale = new Scale({
+		'name': 'xScale',
+		'domain': [ 0, 20 ]
+	});
+	t.deepEqual( scale.domain, [ 0, 20 ], 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `domain` property which can be set to a valid value', function test( t ) {
+	var scale;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+
+	scale.domain = [ 0, 10 ];
+	t.deepEqual( scale.domain, [ 0, 10 ], 'returns expected value' );
+
+	scale.domain = [ 0, 20 ];
+	t.deepEqual( scale.domain, [ 0, 20 ], 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance which emits an event when the `domain` property is set to a new value', function test( t ) {
+	var scale;
+	var count;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+	count = 0;
+
+	scale.on( 'change', onChange );
+
+	scale.domain = [ 0, 10 ];
+	t.strictEqual( count, 1, 'returns expected value' );
+
+	scale.domain = [ 0, 20 ];
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	// Setting to the same value should not emit an event:
+	scale.domain = [ 0, 20 ];
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	t.end();
+
+	function onChange() {
+		count += 1;
+	}
+});

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

@@ -0,0 +1,153 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
+var Scale = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof Scale, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the constructor returns an instance which has a `domainMax` property', function test( t ) {
+	var v;
+
+	v = new Scale({
+		'name': 'xScale'
+	});
+	t.strictEqual( hasOwnProp( v, 'domainMax' ), false, 'returns expected value' );
+	t.strictEqual( hasProp( v, 'domainMax' ), true, 'returns expected value' );
+	t.strictEqual( isUndefined( v.domainMax ), true, 'returns expected value' );
+
+	v = new Scale({
+		'name': 'xScale',
+		'domainMax': 10
+	});
+	t.strictEqual( isNumber( v.domainMax ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `domainMax` property which throws an error if set to an invalid value', function test( t ) {
+	var values;
+	var i;
+	var v;
+
+	v = new Scale({
+		'name': 'xScale'
+	});
+
+	values = [
+		'5',
+		null,
+		true,
+		false,
+		[],
+		{},
+		function noop() {}
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			v.domainMax = value;
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `domainMax` property', function test( t ) {
+	var scale;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+	t.strictEqual( isUndefined( scale.domainMax ), true, 'returns expected value' );
+
+	scale = new Scale({
+		'name': 'xScale',
+		'domainMax': 10
+	});
+	t.strictEqual( scale.domainMax, 10, 'returns expected value' );
+
+	scale = new Scale({
+		'name': 'xScale',
+		'domainMax': 20
+	});
+	t.strictEqual( scale.domainMax, 20, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `domainMax` property which can be set to a valid value', function test( t ) {
+	var scale;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+
+	scale.domainMax = 10;
+	t.strictEqual( scale.domainMax, 10, 'returns expected value' );
+
+	scale.domainMax = 20;
+	t.strictEqual( scale.domainMax, 20, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance which emits an event when the `domainMax` property is set to a new value', function test( t ) {
+	var scale;
+	var count;
+
+	scale = new Scale({
+		'name': 'xScale'
+	});
+	count = 0;
+
+	scale.on( 'change', onChange );
+
+	scale.domainMax = 10;
+	t.strictEqual( count, 1, 'returns expected value' );
+
+	scale.domainMax = 20;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	// Setting to the same value should not emit an event:
+	scale.domainMax = 20;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	t.end();
+
+	function onChange() {
+		count += 1;
+	}
+});