diff --git a/packages/svelte/tests/css/samples/undefined-with-scope/expected.html b/packages/svelte/tests/css/samples/undefined-with-scope/expected.html
index ddb9429bc8..5eecaa9bb2 100644
--- a/packages/svelte/tests/css/samples/undefined-with-scope/expected.html
+++ b/packages/svelte/tests/css/samples/undefined-with-scope/expected.html
@@ -1 +1 @@
-<p class=" svelte-xyz">Foo</p>
\ No newline at end of file
+<p class="svelte-xyz">Foo</p>
\ No newline at end of file
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-null-classname-with-style/_config.js b/packages/svelte/tests/runtime-legacy/samples/attribute-null-classname-with-style/_config.js
index c8710f9038..cbd0456e13 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-null-classname-with-style/_config.js
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-null-classname-with-style/_config.js
@@ -1,17 +1,17 @@
 import { ok, test } from '../../test';
 
 export default test({
-	html: '<div class=" svelte-x1o6ra"></div>',
+	html: '<div class="svelte-x1o6ra"></div>',
 
 	test({ assert, component, target }) {
 		const div = target.querySelector('div');
 		ok(div);
 
 		component.testName = null;
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = undefined;
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = undefined + '';
 		assert.equal(div.className, 'undefined svelte-x1o6ra');
@@ -32,10 +32,10 @@ export default test({
 		assert.equal(div.className, 'true svelte-x1o6ra');
 
 		component.testName = {};
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = '';
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = 'testClassName';
 		assert.equal(div.className, 'testClassName svelte-x1o6ra');
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-null-func-classname-with-style/_config.js b/packages/svelte/tests/runtime-legacy/samples/attribute-null-func-classname-with-style/_config.js
index 8d0f411b8f..081fceecf2 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-null-func-classname-with-style/_config.js
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-null-func-classname-with-style/_config.js
@@ -16,10 +16,10 @@ export default test({
 		assert.equal(div.className, 'testClassName svelte-x1o6ra');
 
 		component.testName = null;
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = undefined;
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = undefined + '';
 		assert.equal(div.className, 'undefined svelte-x1o6ra');
@@ -40,9 +40,9 @@ export default test({
 		assert.equal(div.className, 'true svelte-x1o6ra');
 
 		component.testName = {};
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 
 		component.testName = '';
-		assert.equal(div.className, ' svelte-x1o6ra');
+		assert.equal(div.className, 'svelte-x1o6ra');
 	}
 });