Internal graphics not initialized yet

[perNyfelt]

The following test fails about once every 10 runs with Internal graphics not initialized yet (i.e. the test works 90% of the time) :

package se.alipsa.rideutils;

import javafx.application.Platform;
import javafx.scene.image.Image;
import javafx.stage.Stage;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;;
import org.testfx.api.FxRobot;
import org.testfx.framework.junit5.ApplicationExtension;
import org.testfx.framework.junit5.Start;

import java.io.IOException;

import static org.junit.jupiter.api.Assertions.assertNotNull;

@ExtendWith(ApplicationExtension.class)
public class ReadImageTest  {

  @Start
  public void start(Stage stage) {
    stage.show();
  }

  @Test
  public void testReadSvg() throws IOException {
    Image img = ReadImage.read("sinplot.svg");
    assertNotNull(img);
  }

  @Test
  public void testReadPng() throws IOException {
    Image img = ReadImage.read("plot.png");
    assertNotNull(img);
  }

  @Test
  public void testReadJpg() throws IOException {
    Image img = ReadImage.read("dino.jpg");
    assertNotNull(img);
  }
}

the stack trace produced when it fails is:

Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.773 sec <<< FAILURE!
se.alipsa.rideutils.ReadImageTest.testReadJpg()  Time elapsed: 0.286 sec  <<< FAILURE!
java.lang.RuntimeException: Internal graphics not initialized yet
        at javafx.graphics/com.sun.glass.ui.Screen.getScreens(Screen.java:70)
        at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.getScreens(QuantumToolkit.java:710)
        at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.getMaxRenderScale(QuantumToolkit.java:737)
        at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.loadImage(QuantumToolkit.java:746)
        at javafx.graphics/javafx.scene.image.Image.loadImage(Image.java:1052)
        at javafx.graphics/javafx.scene.image.Image.initialize(Image.java:802)
        at javafx.graphics/javafx.scene.image.Image.<init>(Image.java:618)
        at se.alipsa.rideutils.ReadImage.read(ReadImage.java:42)
        at se.alipsa.rideutils.ReadImageTest.testReadJpg(ReadImageTest.java:38)

I am using
openjdk version "11.0.14" 2022-01-18 LTS
OpenJDK Runtime Environment (build 11.0.14+9-LTS)
OpenJDK 64-Bit Server VM (build 11.0.14+9-LTS, mixed mode)

with the following dependencies

    <dependency>
      <groupId>org.openjfx</groupId>
      <artifactId>javafx-controls</artifactId>
      <version>17.0.2</version>
    </dependency>

    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-api</artifactId>
      <version>5.8.2</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.testfx</groupId>
      <artifactId>testfx-junit5</artifactId>
      <version>4.0.16-alpha</version>
      <scope>test</scope>
    </dependency>

Is there something I can do prevent tests from running before the environment has finished initializing?