junit-servers-core/src/main/java/com/github/mjeanroy/junit/servers/servers/AbstractEmbeddedServer.java
private void destroyEnvironment() {
		for (Map.Entry<String, String> property : configuration.getEnvProperties().entrySet()) {
			String name = property.getKey();

			String oldValue = oldProperties.get(name);
			oldProperties.remove(name);

			if (oldValue == null) {
				clearProperty(name);
			}
			else {
				setProperty(name, oldValue);
			}
		}
	}
private void destroyEnvironment() {
		for (Map.Entry<String, String> property : configuration.getEnvProperties().entrySet()) {
			String name = property.getKey();

			String oldValue = oldProperties.get(name);
			oldProperties.remove(name);

			if (oldValue == null) {
				clearProperty(name);
			}
			else {
				setProperty(name, oldValue);
			}
		}
	}
Reset custom environment properties.
Initial values stored in {@link #oldProperties} will be restored
or clear.