test(chrome): a hinted field is not named by its css class

The fixture inputs carried no class at all, so the test could not fail
the way the bug did. They now carry folio-web-shaped classes, and the
test asserts the editable gate the hint is read behind.

internal/driver/chrome/driver_test.go

@@ -317,14 +317,14 @@ func TestHierarchy_ScrollableAttribute(t *testing.T) {
 func TestHierarchy_HintTextNamesAnEditableField(t *testing.T) {
 	const html = `<body>` +
 		`<label id="amount-label" for="amount">Amount</label>` +
-		`<input id="amount" placeholder="0.00" name="amount-field">` +
-		`<input id="search" aria-label="Search" placeholder="Type here" name="q">` +
+		`<input id="amount" class="input amount-input" placeholder="0.00" name="amount-field">` +
+		`<input id="search" class="input search-input" aria-label="Search" placeholder="Type here" name="q">` +
 		`<label id="note-label" for="note"> </label>` +
-		`<input id="note" placeholder="What's this for?" name="note-field">` +
-		`<input id="reference" name="reference-field">` +
-		`<input id="unnamed">` +
-		`<input id="agree" type="checkbox" placeholder="ignored">` +
-		`<button id="go" placeholder="ignored">go</button>` +
+		`<input id="note" class="input note-input" placeholder="What's this for?" name="note-field">` +
+		`<input id="reference" class="input" name="reference-field">` +
+		`<input id="unnamed" class="input">` +
+		`<input id="agree" class="checkbox" type="checkbox" placeholder="ignored">` +
+		`<button id="go" class="button" placeholder="ignored">go</button>` +
 		`</body>`
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "text/html")
@@ -346,17 +346,18 @@ func TestHierarchy_HintTextNamesAnEditableField(t *testing.T) {
 
 	type node struct {
 		Attributes map[string]string `json:"attributes"`
+		Editable   bool              `json:"editable"`
 		Children   []node            `json:"children"`
 	}
 	var root node
 	if err := json.Unmarshal([]byte(dump), &root); err != nil {
 		t.Fatalf("unmarshal hierarchy: %v", err)
 	}
-	hintByID := map[string]string{}
+	fieldByID := map[string]node{}
 	var walk func(n node)
 	walk = func(n node) {
 		if id := n.Attributes["resource-id"]; id != "" {
-			hintByID[id] = n.Attributes["hintText"]
+			fieldByID[id] = n
 		}
 		for _, c := range n.Children {
 			walk(c)
@@ -365,19 +366,30 @@ func TestHierarchy_HintTextNamesAnEditableField(t *testing.T) {
 	walk(root)
 
 	for _, tc := range []struct {
-		id   string
-		want string
+		id       string
+		want     string
+		editable bool
 	}{
-		{"search", "Search"},
-		{"amount", "Amount"},
-		{"note", "What's this for?"},
-		{"reference", "reference-field"},
-		{"unnamed", ""},
-		{"agree", ""},
-		{"go", ""},
+		{"search", "Search", true},
+		{"amount", "Amount", true},
+		{"note", "What's this for?", true},
+		{"reference", "reference-field", true},
+		{"unnamed", "", true},
+		{"agree", "", false},
+		{"go", "", false},
 	} {
-		if hintByID[tc.id] != tc.want {
-			t.Errorf("%q: hintText = %q, want %q", tc.id, hintByID[tc.id], tc.want)
+		field := fieldByID[tc.id]
+		if field.Attributes["hintText"] != tc.want {
+			t.Errorf("%q: hintText = %q, want %q", tc.id, field.Attributes["hintText"], tc.want)
+		}
+		// visibleLabel reaches the hint only for an element the dump calls
+		// editable, so a field named right and marked wrong is still named by
+		// its class downstream.
+		if field.Editable != tc.editable {
+			t.Errorf("%q: editable = %v, want %v", tc.id, field.Editable, tc.editable)
+		}
+		if tc.want != "" && field.Attributes["hintText"] == field.Attributes["class"] {
+			t.Errorf("%q: named by its CSS class %q", tc.id, field.Attributes["class"])
 		}
 	}
 }