java - JUnit not recognized in VS Code anymore after reopening project (no green triangle icons) - Stack Overflow

admin管理员组

文章数量:1344315

I'm trying to run JUnit tests in Visual Studio Code without using Maven or Gradle, just using plain .java files and .jar libraries.

---

Project Setup:

I'm using VS Code with the Java Extension Pack, and I added the following to .vscode/settings.json:

{
  "java.project.sourcePaths": [
    "src/main/java",
    "src/test/java"
  ],
  "java.project.outputPath": "bin",
  "java.project.referencedLibraries": [
    "lib/**/*.jar"
  ]
}

---

Inside the lib/ folder, I placed:

junit-4.13.2.jar

hamcrest-core-1.3.jarTestHello/
├── lib/
│   ├── junit-4.13.2.jar
│   └── hamcrest-core-1.3.jar
├── src/
│   ├── main/java/ExceptionTest/MessageUtil.java
│   └── test/java/ExceptionTest/TestJunit.java
├── .vscode/settings.json

What worked initially:

The first time I wrote my test, I just: Created .java files manually in a folder, Clicked on the Testing tab in the left sidebar, VS Code asked me to enable "Java Testing", and I accepted. It worked! I saw the green triangle "Run Test" icons next to my test methods.

The problem:

After closing and reopening VS Code later, now: When I click on the Testing panel, it says: "No tests found". The test annotations like @Test, @Before, and Assert are underlined with errors: The import .junit cannot be resolved, Test cannot be resolved to a type, Assert cannot be resolved. The green triangle icons (Run Test) have disappeared from the gutter

My test class (TestJunit.java):

package ExceptionTest;

import .junit.Test;
import static .junit.Assert.assertEquals;

public class TestJunit {

    String message = "Robert";
    MessageUtil messageUtil = new MessageUtil(message);

    @Test
    public void testSalutationMessage() {
        message = "Hi!" + "Robert";
        assertEquals(message, messageUtil.salutationMessage());
    }
}

Question: How can I make VS Code persistently recognize and run JUnit tests without Maven or Gradle? Why did the tests disappear after restarting VS Code? Is there a way to force VS Code to re-scan and show the test icons again?

I'm trying to run JUnit tests in Visual Studio Code without using Maven or Gradle, just using plain .java files and .jar libraries.

---

Project Setup:

I'm using VS Code with the Java Extension Pack, and I added the following to .vscode/settings.json:

{
  "java.project.sourcePaths": [
    "src/main/java",
    "src/test/java"
  ],
  "java.project.outputPath": "bin",
  "java.project.referencedLibraries": [
    "lib/**/*.jar"
  ]
}

---

Inside the lib/ folder, I placed:

junit-4.13.2.jar

hamcrest-core-1.3.jarTestHello/
├── lib/
│   ├── junit-4.13.2.jar
│   └── hamcrest-core-1.3.jar
├── src/
│   ├── main/java/ExceptionTest/MessageUtil.java
│   └── test/java/ExceptionTest/TestJunit.java
├── .vscode/settings.json

What worked initially:

The first time I wrote my test, I just: Created .java files manually in a folder, Clicked on the Testing tab in the left sidebar, VS Code asked me to enable "Java Testing", and I accepted. It worked! I saw the green triangle "Run Test" icons next to my test methods.

The problem:

After closing and reopening VS Code later, now: When I click on the Testing panel, it says: "No tests found". The test annotations like @Test, @Before, and Assert are underlined with errors: The import .junit cannot be resolved, Test cannot be resolved to a type, Assert cannot be resolved. The green triangle icons (Run Test) have disappeared from the gutter

My test class (TestJunit.java):

package ExceptionTest;

import .junit.Test;
import static .junit.Assert.assertEquals;

public class TestJunit {

    String message = "Robert";
    MessageUtil messageUtil = new MessageUtil(message);

    @Test
    public void testSalutationMessage() {
        message = "Hi!" + "Robert";
        assertEquals(message, messageUtil.salutationMessage());
    }
}

Question: How can I make VS Code persistently recognize and run JUnit tests without Maven or Gradle? Why did the tests disappear after restarting VS Code? Is there a way to force VS Code to re-scan and show the test icons again?

• java
• visual-studio-code
• junit
• classpath

Share Improve this question Follow edited yesterday Crescenzo De Marco asked yesterday Crescenzo De MarcoCrescenzo De Marco 111 bronze badge

Add a comment  | 

1 Answer 1

Sorted by: Reset to default 0

I tested your project and there is no problem. This may be caused by cache. To re-scan, click Java Projects panel -> three dots (more action) -> clean workspace. Then prompt a warning message window -> reload and delete.

本文标签：