Adding tests to check if has multiple class with same name

test/validator/samples/class-multi-name-multiple-attrs/input.svelte

@@ -0,0 +1,3 @@
+<div class:one,two="{true}" class:two,three="{false}">
+	Hello World
+</div>

test/validator/samples/class-multi-name-multiple-attrs/warnings.json

@@ -0,0 +1,17 @@
+[
+	{
+		"code": "class-name-multiple-attrs",
+		"message": "Class: avoid using class name 'two' in more than one class attribute",
+		"start": {
+			"character": 0,
+			"column": 0,
+			"line": 1
+		},
+		"end": {
+			"character": 74,
+			"column": 6,
+			"line": 3
+		},
+		"pos": 0
+	}
+]

test/validator/samples/class-name-multiple-attrs/input.svelte

@@ -0,0 +1,5 @@
+<script>
+	let one;
+</script>
+
+<div class="one" class:one/>

test/validator/samples/class-name-multiple-attrs/warnings.json

@@ -0,0 +1,17 @@
+[
+	{
+		"code": "class-name-multiple-attrs",
+		"message": "Class: avoid using class name 'one' in more than one class attribute",
+		"start": {
+			"character": 30,
+			"column": 0,
+			"line": 5
+		},
+		"end": {
+			"character": 58,
+			"column": 28,
+			"line": 5
+		},
+		"pos": 30
+	}
+]