Support species height and width ranges

internal/web/templates_test.go

@@ -371,11 +371,19 @@ func TestEmptyOptionalSpeciesDimensionsDoNotBlockSubmit(t *testing.T) {
 	response := httptest.NewRecorder()
 	app.render(response, http.StatusOK, "species_form.tmpl", data)
 	body := response.Body.String()
-	for _, field := range []string{"spacing_cm", "height_cm"} {
-		if !strings.Contains(body, "name='"+field+"' value=''") {
+	for _, field := range []string{"spacing_cm", "height_cm_from", "height_cm_to", "width_cm_from", "width_cm_to"} {
+		fieldStart := strings.Index(body, "name='"+field+"'")
+		fieldEnd := -1
+		if fieldStart >= 0 {
+			fieldEnd = strings.Index(body[fieldStart:], ">")
+		}
+		if fieldStart < 0 || fieldEnd < 0 || !strings.Contains(body[fieldStart:fieldStart+fieldEnd], "value=''") {
 			t.Errorf("optional field %s should render empty: %s", field, body)
 		}
 	}
+	if got := strings.Count(body, "class='dimension-range'"); got != 2 {
+		t.Errorf("dimension ranges: got %d composite controls, want 2: %s", got, body)
+	}
 }
 
 func TestTaskDueFormatsWindows(t *testing.T) {