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Testing / JUnit6 Interview Questions

What is the ConsoleLauncher and how do you run JUnit 6 tests from the command line?

The ConsoleLauncher (junit-platform-console-standalone) is a self-contained JAR that can discover and run JUnit 6 tests from the command line without Maven or Gradle. It is useful for CI scripts, Docker containers, and quick local runs.

# Download the standalone JAR:
# From: https://repo1.maven.org/maven2/org/junit/platform/
#       junit-platform-console-standalone/6.1.1/
#       junit-platform-console-standalone-6.1.1.jar

# Basic run: scan classpath for tests
java -jar junit-platform-console-standalone-6.1.1.jar \
    --scan-class-path \
    --classpath "target/test-classes:target/classes"

# Select specific class:
java -jar junit-platform-console-standalone-6.1.1.jar \
    --select-class "com.example.OrderServiceTest"

# Select by package:
java -jar junit-platform-console-standalone-6.1.1.jar \
    --scan-class-path \
    --select-package "com.example.unit"

# Filter by tag:
java -jar junit-platform-console-standalone-6.1.1.jar \
    --scan-class-path \
    --include-tag "fast" \
    --exclude-tag "slow"

# Fail fast (JUnit 6 CancellationToken):
java -jar junit-platform-console-standalone-6.1.1.jar \
    --scan-class-path \
    --fail-fast

# Generate XML report (for CI systems like Jenkins):
java -jar junit-platform-console-standalone-6.1.1.jar \
    --scan-class-path \
    --reports-dir ./test-reports

What is the purpose of the junit-platform-console-standalone JAR?
What JUnit 6 feature does the --fail-fast flag in ConsoleLauncher use internally?

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