# Where Are the Test Files Located in TheAlgorithms/Java?

> Find test files in TheAlgorithms/Java easily. Discover their location under src/test/java, following Maven conventions for organized project structure.

- Repository: [The Algorithms/Java](https://github.com/TheAlgorithms/Java)
- Tags: how-to-guide
- Published: 2026-03-04

---

**In the TheAlgorithms/Java repository, all test files reside under `src/test/java`, mirroring the package structure of the production code in `src/main/java` according to Maven standard conventions.**

The TheAlgorithms/Java repository organizes its comprehensive algorithm implementations using Apache Maven's standard directory layout. Understanding exactly where test files are located and how they correspond to source code is essential for contributors running the JUnit 5 test suite or validating new algorithm implementations against the existing codebase.

## Standard Maven Directory Layout

The repository adheres strictly to **Maven's conventional project structure**. Production source code resides under **`src/main/java`**, while the complete test suite lives under **`src/test/java`**. This separation allows Maven to automatically compile production classes and execute tests when you run `mvn test`, leveraging the **JUnit 5** dependency declared in the root **[`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml)** file.

## Mapping Source Files to Test Files

Test classes follow a direct one-to-one mapping with production code packages. For example, the graph algorithm implementation located at:

```

src/main/java/com/thealgorithms/graph/PushRelabel.java

```

has its corresponding JUnit 5 test class at:

```

src/test/java/com/thealgorithms/graph/PushRelabelTest.java

```

This pattern repeats across all algorithm categories including `ciphers`, `bitmanipulation`, and `backtracking`. Additional representative test files include **[`src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java`](https://github.com/TheAlgorithms/Java/blob/main/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java)** and **[`src/test/java/com/thealgorithms/bitmanipulation/CountSetBitsTest.java`](https://github.com/TheAlgorithms/Java/blob/main/src/test/java/com/thealgorithms/bitmanipulation/CountSetBitsTest.java)**, each verifying the correctness of their respective production classes.

## Executing the Test Suite

### Command Line with Maven

From the repository root, execute the complete test suite using:

```bash
mvn clean test

```

This command compiles all production code from `src/main/java`, compiles test classes from `src/test/java`, and executes them, reporting success or failure for each test class individually.

To run a specific test class— for instance, the graph algorithm validation— use the `-Dtest` parameter:

```bash
mvn -Dtest=PushRelabelTest test

```

### IDE Integration

When working with **IntelliJ IDEA** or similar IDEs that recognize Maven projects:

1. Open the project root (the IDE automatically detects the [`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml) configuration)
2. Navigate to any test class under `src/test/java` (such as [`PushRelabelTest.java`](https://github.com/TheAlgorithms/Java/blob/main/PushRelabelTest.java))
3. Right-click the class and select **Run 'PushRelabelTest'**

The IDE delegates to Maven's test lifecycle, ensuring consistent JUnit 5 execution parameters defined in [`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml).

## JUnit 5 Test Implementation Pattern

All test files in the repository follow a consistent JUnit 5 structure defined in the Maven configuration. Here is the template used throughout TheAlgorithms/Java:

```java
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;

class ExampleAlgorithmTest {

    @Test
    void testBasicScenario() {
        // Arrange
        int input = 5;

        // Act
        int result = ExampleAlgorithm.compute(input);

        // Assert
        assertEquals(25, result, "The algorithm should square the input");
    }
}

```

Tests utilize the **`@Test`** annotation from `org.junit.jupiter.api.Test` and assertion methods like **`assertEquals`** and **`assertTrue`** from `org.junit.jupiter.api.Assertions`. This standardization ensures compatibility with the **Maven Surefire plugin** configuration in [`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml).

## Summary

- **Test root**: All tests reside under `src/test/java` in the TheAlgorithms/Java repository
- **Structure mirroring**: Test packages exactly mirror production packages under `src/main/java` (e.g., `com.thealgorithms.graph` maps to `com.thealgorithms.graph`)
- **Build configuration**: Maven coordinates testing through [`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml), which declares JUnit 5 dependencies and test execution settings
- **Execution**: Run the full suite with `mvn test` or specific classes with `mvn -Dtest=ClassName test`
- **Examples**: Reference implementations include [`PushRelabelTest.java`](https://github.com/TheAlgorithms/Java/blob/main/PushRelabelTest.java), [`AESEncryptionTest.java`](https://github.com/TheAlgorithms/Java/blob/main/AESEncryptionTest.java), and [`CountSetBitsTest.java`](https://github.com/TheAlgorithms/Java/blob/main/CountSetBitsTest.java)

## Frequently Asked Questions

### What testing framework does TheAlgorithms/Java use?

The repository uses **JUnit 5** (Jupiter). The [`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml) file in the repository root defines this dependency and configures the Maven Surefire plugin to execute tests during the build lifecycle, ensuring all algorithm implementations in `src/main/java` have corresponding verifiable tests in `src/test/java`.

### How do I run only a specific test class instead of the entire suite?

Use the Maven `-Dtest` parameter followed by the class name. For example, to execute only the bit manipulation tests: `mvn -Dtest=CountSetBitsTest test`. This command compiles the relevant production code from `src/main/java/com/thealgorithms/bitmanipulation/` and executes only the specified test class from `src/test/java/com/thealgorithms/bitmanipulation/`.

### Why does the test directory structure mirror the source directory?

Maven's standard directory layout requires this parallelism to automatically map test classes to their production counterparts. When you place [`PushRelabelTest.java`](https://github.com/TheAlgorithms/Java/blob/main/PushRelabelTest.java) in `src/test/java/com/thealgorithms/graph/`, Maven and IDEs instantly recognize it as the test for [`PushRelabel.java`](https://github.com/TheAlgorithms/Java/blob/main/PushRelabel.java) in `src/main/java/com/thealgorithms/graph/`, enabling seamless navigation and execution without additional classpath configuration.

### Where is the build configuration that defines how tests are executed?

The **[`pom.xml`](https://github.com/TheAlgorithms/Java/blob/main/pom.xml)** file located in the repository root contains the complete build configuration. It declares JUnit 5 as the test dependency, specifies the `src/test/java` directory as the test source root, and configures the Maven Surefire plugin to run tests when you invoke `mvn test` or when continuous integration pipelines execute build commands.