test: add tests for Axis constructor and properties

lib/node_modules/@stdlib/plot/vega/axis/ctor/test/test.aria.js

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+/**
+* @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 hasProp = require( '@stdlib/assert/has-property' );
+var isBoolean = require( '@stdlib/assert/is-boolean' );
+var Axis = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof Axis, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the constructor returns an instance which has a `aria` property', function test( t ) {
+	var v;
+
+	v = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	t.strictEqual( hasOwnProp( v, 'aria' ), false, 'returns expected value' );
+	t.strictEqual( hasProp( v, 'aria' ), true, 'returns expected value' );
+	t.strictEqual( isBoolean( v.aria ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the constructor throws an error if provided an invalid `aria` option', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'5',
+		5,
+		NaN,
+		null,
+		void 0,
+		[],
+		{},
+		function noop() {}
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), Error, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			var axis = new Axis({ // eslint-disable-line no-unused-vars
+				'scale': 'xScale',
+				'orient': 'bottom',
+				'aria': value
+			});
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `aria` property which throws an error if set to a non-boolean value', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'5',
+		5,
+		NaN,
+		null,
+		void 0,
+		[],
+		{},
+		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() {
+			var axis = new Axis({
+				'scale': 'xScale',
+				'orient': 'bottom'
+			});
+			axis.aria = value;
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `aria` property', function test( t ) {
+	var axis;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	t.strictEqual( axis.aria, true, 'returns expected value' );
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom',
+		'aria': false
+	});
+	t.strictEqual( axis.aria, false, 'returns expected value' );
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom',
+		'aria': true
+	});
+	t.strictEqual( axis.aria, true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `aria` property which can be set to a boolean', function test( t ) {
+	var axis;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+
+	axis.aria = true;
+	t.strictEqual( axis.aria, true, 'returns expected value' );
+
+	axis.aria = false;
+	t.strictEqual( axis.aria, false, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance which emits an event when the `aria` property is set to a new value', function test( t ) {
+	var axis;
+	var count;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	count = 0;
+
+	axis.on( 'change', onChange );
+
+	axis.aria = false;
+	t.strictEqual( count, 1, 'returns expected value' );
+
+	axis.aria = true;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	// Setting to the same value should not emit an event:
+	axis.aria = true;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	t.end();
+
+	function onChange() {
+		count += 1;
+	}
+});

lib/node_modules/@stdlib/plot/vega/axis/ctor/test/test.band_position.js

@@ -0,0 +1,182 @@
+/**
+* @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' );
+var Axis = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof Axis, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the constructor returns an instance which has a `bandPosition` property', function test( t ) {
+	var v;
+
+	v = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	t.strictEqual( hasOwnProp( v, 'bandPosition' ), false, 'returns expected value' );
+	t.strictEqual( hasProp( v, 'bandPosition' ), true, 'returns expected value' );
+	t.strictEqual( isUndefined( v.bandPosition ), true, 'returns expected value' );
+
+	v = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom',
+		'bandPosition': 0.5
+	});
+	t.strictEqual( isNumber( v.bandPosition ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor throws an error if provided an invalid `bandPosition` option', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'beep',
+		-0.1,
+		1.1,
+		NaN,
+		{},
+		function noop() {}
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), Error, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			var axis = new Axis({ // eslint-disable-line no-unused-vars
+				'scale': 'xScale',
+				'orient': 'bottom',
+				'bandPosition': value
+			});
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `bandPosition` property which throws an error if set to an invalid value', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'beep',
+		-0.1,
+		1.1,
+		NaN,
+		{},
+		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() {
+			var axis = new Axis({
+				'scale': 'xScale',
+				'orient': 'bottom'
+			});
+			axis.bandPosition = value;
+		};
+	}
+});
+
+tape( 'the constructor returns an instance having a `bandPosition` property', function test( t ) {
+	var axis;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	t.strictEqual( isUndefined( axis.bandPosition ), true, 'returns expected value' );
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom',
+		'bandPosition': 0.5
+	});
+	t.strictEqual( axis.bandPosition, 0.5, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance having a `bandPosition` property which can be set to a valid value', function test( t ) {
+	var axis;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+
+	axis.bandPosition = 0.5;
+	t.strictEqual( axis.bandPosition, 0.5, 'returns expected value' );
+
+	axis.bandPosition = 0;
+	t.strictEqual( axis.bandPosition, 0, 'returns expected value' );
+
+	axis.bandPosition = 1;
+	t.strictEqual( axis.bandPosition, 1, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the constructor returns an instance which emits an event when the `bandPosition` property is set to a new value', function test( t ) {
+	var axis;
+	var count;
+
+	axis = new Axis({
+		'scale': 'xScale',
+		'orient': 'bottom'
+	});
+	count = 0;
+
+	axis.on( 'change', onChange );
+
+	axis.bandPosition = 0.5;
+	t.strictEqual( count, 1, 'returns expected value' );
+
+	axis.bandPosition = 0.3;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	// Setting to the same value should not emit an event:
+	axis.bandPosition = 0.3;
+	t.strictEqual( count, 2, 'returns expected value' );
+
+	t.end();
+
+	function onChange() {
+		count += 1;
+	}
+});