Simple test class for apex class

public class HelloWorld {
	public String hello(integer wRet ) {

		if (wRet >0)
		{
			return 'Hello World_1';
		}
		else
		{
			return 'Hello World_0';
		}
	}
}

@isTest(SeeAllData=false)
public class HelloWorld_isTest {
static testMethod void validateHellow() {
HelloWorld hello_world = new HelloWorld();
String result1 = hello_world.hello(2);

String result0 = hello_world.hello(0);
}
}

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