How can I solve this problem with run spring boot test code?

This is my test code in spring boot.

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.ResultActions;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import com.myname.pjt.springboot.web.HelloController;

@RunWith(SpringRunner.class)
@WebMvcTest(controllers = HelloController.class)
public class HelloControllerTest {

    @Autowired
    private MockMvc mvc;

    @Test
    public void hello_will_return() throws Exception {
        String hello = "hello";
        mvc.perform(get("/hello")).andExpect(status().isOk()).andExpect(content().string(hello));
    }
}

And this is error message.

Testing started at 9:34 PM ...

> Task :compileJava UP-TO-DATE
> Task :processResources NO-SOURCE
> Task :classes UP-TO-DATE
> Task :compileTestJava
> Task :processTestResources NO-SOURCE
> Task :testClasses
> Task :test FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':test'.
> No tests found for given includes: [com.myname.test.springboot.web.HelloControllerTest.hello_will_return](filter.includeTestsMatching)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.3/userguide/command_line_interface.html#sec:command_line_warnings
BUILD FAILED in 1s
3 actionable tasks: 2 executed, 1 up-to-date

I don't know how to solve this problem...

I tried these.

1. Changed Settings > Build, Execution, Deployment > Build Tools > Gradle > Run test using > Changed "Gradle (Default)" to "IntelliJ IDEA"

2. Add secure = false in @WebMvcTest

-> @WebMvcTest(controllers = HelloController.class) to @WebMvcTest(controllers = {HelloController.class}, secure = false)

But it does not still work...
Please help me...

Also this is my build.gradle.

buildscript {
    ext {
        springBootVersion = '2.1.7.RELEASE'
    }
    repositories {
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

group 'com.myname.pjt'
version '1.0-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
    jcenter()
}

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

It looks like you are running your test using JUnit 5, but declare your test using a JUnit 4 annotation (org.junit.Test vs. org.junit.jupiter.api.Test) and that's why it isn't picking up on your test.