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src/test/java/CohortsTest.java

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+import java.util.ArrayList;
+import java.util.List;
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CohortsTest {
+    Cohort emptyCohort;
+    Cohort cohortHaveMany;
+    Cohort cohortHaveOne;
+
+    @Before
+    public void setUp(){
+        emptyCohort=new Cohort();
+        cohortHaveOne = new Cohort();
+        cohortHaveMany = new Cohort();
+        Student nick_james = new Student(1, "Nick James");
+        nick_james.addGrade(99);
+
+        Student nick_jr  = new Student(2, "Nick Jr");
+        nick_jr.addGrade(99);
+        nick_jr.addGrade(99);
+        nick_jr.addGrade(99);
+
+        cohortHaveOne.addStudent(nick_james);
+        cohortHaveMany.addStudent(nick_james);
+        cohortHaveMany.addStudent(nick_jr);
+
+    }
+    @Test
+    public void addStudentTest(){
+        cohortHaveMany.addStudent(new Student(3, "Jon Andrew"));
+        assertEquals("Jon Andrew", cohortHaveMany.getStudents().get(2).getName());
+        cohortHaveMany.addStudent(new Student(4, "Michael Leo"));
+        assertEquals(4, cohortHaveMany.getStudents().size());
+    }
+    @Test
+    public void getStudentsTest(){
+        assertEquals(0, emptyCohort.getStudents().size());
+        assertEquals(1, cohortHaveOne.getStudents().size());
+
+        assertEquals(1, cohortHaveMany.getStudents().get(0).getId());
+        assertEquals(2, cohortHaveMany.getStudents().get(1).getId());
+    }
+
+    @Test
+    public void getAverageTest(){
+        assertEquals(Double.NaN, emptyCohort.getCohortAverage(), 0);
+        assertEquals(99.0, cohortHaveOne.getCohortAverage(), 0);
+        assertEquals(99.0, cohortHaveMany.getCohortAverage(), 0);
+    }
+}