add tests

test/validator/samples/a11y-anchor-is-valid/input.svelte

@@ -1,4 +1,8 @@
 <a>not actually a link</a>
 <a href=''>invalid</a>
 <a href='#'>invalid</a>
-<a href="javascript:void(0)">invalid</a>
+<a href='javascript:void(0)'>invalid</a>
+<a name=''>invalid</a>
+<a id=''>invalid</a>
+<a name='fragment'>valid</a>
+<a id='fragment'>valid</a>

test/validator/samples/a11y-anchor-is-valid/warnings.json

@@ -58,5 +58,35 @@
 			"character": 102
 		},
 		"pos": 77
+	},
+	{
+		"code": "a11y-missing-attribute",
+		"message": "A11y: <a> element should have an href attribute",
+		"start": {
+			"line": 5,
+			"column": 0,
+			"character": 115
+		},
+		"end": {
+			"line": 5,
+			"column": 22,
+			"character": 137
+		},
+		"pos": 115
+	},
+	{
+		"code": "a11y-missing-attribute",
+		"message": "A11y: <a> element should have an href attribute",
+		"start": {
+			"line": 6,
+			"column": 0,
+			"character": 138
+		},
+		"end": {
+			"line": 6,
+			"column": 20,
+			"character": 158
+		},
+		"pos": 138
 	}
 ]