Set the correct interval when changing spinner by name (#128)

index.js

@@ -59,6 +59,12 @@ class Ora {
 		this._indent = indent;
 	}
 
+	_updateInterval(interval) {
+		if (interval !== undefined) {
+			this.interval = interval;
+		}
+	}
+
 	get spinner() {
 		return this._spinner;
 	}
@@ -71,10 +77,6 @@ class Ora {
 				throw new Error('The given spinner must have a `frames` property');
 			}
 
-			if (spinner.interval !== undefined) {
-				this.interval = spinner.interval;
-			}
-
 			this._spinner = spinner;
 		} else if (process.platform === 'win32') {
 			this._spinner = cliSpinners.line;
@@ -86,6 +88,8 @@ class Ora {
 		} else {
 			throw new Error(`There is no built-in spinner named '${spinner}'. See https://github.com/sindresorhus/cli-spinners/blob/master/spinners.json for a full list.`);
 		}
+
+		this._updateInterval(this._spinner.interval);
 	}
 
 	get text() {

test.js

@@ -269,7 +269,7 @@ test('reset frameIndex when setting new spinner', async t => {
 	t.regex(stripAnsi(await output), /foo baz/);
 });
 
-test('reset interval when setting new spinner', t => {
+test('set the correct interval when changing spinner (object case)', t => {
 	const spinner = new Ora({
 		isEnabled: false,
 		spinner: {frames: ['foo', 'bar']},
@@ -283,6 +283,20 @@ test('reset interval when setting new spinner', t => {
 	t.is(spinner.interval, 200);
 });
 
+test('set the correct interval when changing spinner (string case)', t => {
+	const spinner = new Ora({
+		isEnabled: false,
+		spinner: 'dots',
+		interval: 100
+	});
+
+	t.is(spinner.interval, 100);
+
+	spinner.spinner = 'layer';
+
+	t.is(spinner.interval, 150);
+});
+
 test('throw when incorrect spinner', t => {
 	const ora = new Ora();