BooleanPredicateProcessorTest.java

package com.dkc.pp;

import com.dkc.pp.util.Globals;

import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;

public class BooleanPredicateProcessorTest {

    private Globals globals = new Globals();
    private Map<String, Integer> variables = new HashMap<>();

    @Before
    public void setUp() throws Exception {
        variables.put("friend_count", 100);
        variables.put("a", 60);
        variables.put("b", 60);
        variables.put("c", 60);
        variables.put("d", 60);
    }

    @Test
    public void can_process_greater_than_predicate() {
        assertEquals(true, globals.processPredicate("friend_count > 40", variables));
        assertEquals(false, globals.processPredicate("friend_count > 200", variables));
    }

    @Test
    public void can_process_greater_than_or_equal_to_predicate() {
        assertEquals(false, globals.processPredicate("friend_count >= 101", variables));
        assertEquals(true, globals.processPredicate("friend_count >= 100", variables));
        assertEquals(true, globals.processPredicate("friend_count >= 99", variables));
    }

    @Test
    public void can_process_less_than_predicate() {
        assertEquals(true, globals.processPredicate("friend_count < 120", variables));
        assertEquals(false, globals.processPredicate("friend_count < 80", variables));
    }

    @Test
    public void can_process_less_than_or_equal_to_predicate() {
        assertEquals(true, globals.processPredicate("friend_count <= 101", variables));
        assertEquals(true, globals.processPredicate("friend_count <= 100", variables));
        assertEquals(false, globals.processPredicate("friend_count <= 99", variables));
    }

    @Test
    public void can_process_equal_to_predicate() {
        assertEquals(false, globals.processPredicate("friend_count == 101", variables));
        assertEquals(true, globals.processPredicate("friend_count == 100", variables));
        assertEquals(false, globals.processPredicate("friend_count == 99", variables));
    }

    @Test
    public void can_process_predicate_with_arithmetic() {
        assertEquals(true, globals.processPredicate("a + b + c + d > 200", variables));
        assertEquals(false, globals.processPredicate("a + b + c + d > 900", variables));
    }
}