Yet another JUnit 5 cannot find tests issue Follow

I am using 2020.1.1. I have created a brand new project using New > Project ... and selecting Gradle, and checking IntelliJ Platform Plugin. Then I only changed two things:

in build.gradle I changed testCompile:

plugins {
    id 'java'
    id 'org.jetbrains.intellij' version '0.4.21'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    testCompile 'org.junit.jupiter:junit-jupiter-api:5.6.2'
}

// See https://github.com/JetBrains/gradle-intellij-plugin/
intellij {
    version '2020.1.1'
}
patchPluginXml {
    changeNotes """
      Add change notes here.<br>
      <em>most HTML tags may be used</em>"""
}

And created the file src/main/test/java/org/example/TrivialTest.java:

package org.example;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

public class TrivialTest {
  @Test
  void testTrivial () {
    String helloString = "Hello World";
    Assertions.assertEquals("Hello World", helloString);
  }
}

When I try running Gradle task verification->test:

When I try to run it by clicking the green arrow in the gutter:

What am I missing?