Lesson 4 is done

app/src/main/java/com/example/paktalin/agilejava/CourseSession.java

@@ -14,13 +14,23 @@ class CourseSession {
     private String number;
     private ArrayList<Student> students = new ArrayList<>();
     private Date startDate;
+    private static int count = 0;
+    private int numberOfCredits;
 
-    CourseSession(String department, String number, Date startDate) {
+    private CourseSession(String department, String number, Date startDate) {
         this.department = department;
         this.number = number;
         this.startDate = startDate;
     }
 
+    static CourseSession create(
+            String department,
+            String number,
+            Date startDate) {
+        incrementCount();
+        return new CourseSession(department, number, startDate);
+    }
+
     String getDepartment() {
         return department;
     }
@@ -31,6 +41,7 @@ class CourseSession {
 
     void enroll(Student student) {
         students.add(student);
+        student.addCredits(numberOfCredits);
     }
 
     Student get(int index) {
@@ -62,4 +73,20 @@ class CourseSession {
     ArrayList<Student> getAllStudents() {
         return students;
     }
+
+    static int getCount() {
+        return count;
+    }
+
+    static void resetCount() {
+        CourseSession.count = 0;
+    }
+
+    private static void incrementCount() {
+        count++;
+    }
+
+    void setNumberOfCredits(int numberOfCredits) {
+        this.numberOfCredits = numberOfCredits;
+    }
 }

app/src/main/java/com/example/paktalin/agilejava/DateUtil.java

@@ -10,6 +10,16 @@ import java.util.GregorianCalendar;
 
 class DateUtil {
 
+    //That's how static initialization block works
+    static {
+        long now = System.currentTimeMillis();
+        then = new Date(now + 86400000);
+    }
+
+    private static Date then;
+
+    private DateUtil() {}
+
     static Date createDate(int year, int month, int date) {
         GregorianCalendar calendar = new GregorianCalendar();
         calendar.clear();

app/src/main/java/com/example/paktalin/agilejava/Student.java

@@ -6,12 +6,37 @@ package com.example.paktalin.agilejava;
 
 class Student {
     private String name;
+    private int credits;
+    static final int CREDITS_REQUIRED_FOR_FULL_TIME = 12;
+    static final String IN_STATE = "CO";
+    private String state = "";
 
     Student(String name) {
         this.name = name;
+        credits = 0;
     }
 
     String getName() {
         return name;
     }
+
+    boolean isFullTime() {
+        return credits >= Student.CREDITS_REQUIRED_FOR_FULL_TIME;
+    }
+
+    int getCredits() {
+        return credits;
+    }
+
+    void addCredits(int credits) {
+        this.credits += credits;
+    }
+
+    boolean isInState() {
+        return state.equals(Student.IN_STATE);
+    }
+
+    void setState(String state) {
+        this.state = state.toUpperCase();
+    }
 }

app/src/test/java/com/example/paktalin/agilejava/CourseSessionTest.java

@@ -12,10 +12,11 @@ public class CourseSessionTest extends TestCase {
 
     private CourseSession session;
     private Date startDate;
+    private static final  int CREDITS = 3;
 
     public void setUp() {
         startDate = DateUtil.createDate(2003, 1, 6);
-        session = new CourseSession("ENGL", "101", startDate);
+        session = createCourseSession();
     }
 
     public void testCreate() {
@@ -28,11 +29,13 @@ public class CourseSessionTest extends TestCase {
     public void testEnrollStudents() {
         Student student1 = new Student("Cain DiVoe");
         session.enroll(student1);
+        assertEquals(CREDITS, student1.getCredits());
         assertEquals(student1, session.get(0));
         assertEquals(1, session.getNumberOfStudents());
 
         Student student2 = new Student("Coralee DeVaughn");
         session.enroll(student2);
+        assertEquals(CREDITS, student1.getCredits());
         assertEquals(student2, session.get(1));
         assertEquals(2, session.getNumberOfStudents());
     }
@@ -41,4 +44,18 @@ public class CourseSessionTest extends TestCase {
         Date sixteenWeeksOut = DateUtil.createDate(2003, 4, 25);
         assertEquals(sixteenWeeksOut, session.getEndDate());
     }
+
+    public void testCount() {
+        CourseSession.resetCount();
+        createCourseSession();
+        assertEquals(1, CourseSession.getCount());
+        createCourseSession();
+        assertEquals(2, CourseSession.getCount());
+    }
+
+    private CourseSession createCourseSession() {
+        CourseSession session = CourseSession.create("ENGL", "101", startDate);
+        session.setNumberOfCredits(CREDITS);
+        return session;
+    }
 }

app/src/test/java/com/example/paktalin/agilejava/DateUtilTest.java

@@ -13,7 +13,7 @@ import java.util.GregorianCalendar;
 public class DateUtilTest extends TestCase {
 
     public void testCreateDate() {
-       Date date = new DateUtil().createDate(2000, 1, 1);
+       Date date = DateUtil.createDate(2000, 1, 1);
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        assertEquals(2000, calendar.get(Calendar.YEAR));

app/src/test/java/com/example/paktalin/agilejava/LanguageTests.java

@@ -22,4 +22,14 @@ public class LanguageTests extends TestCase {
         assertEquals("abcd", "ab" + "c" + "d");
     }
 
+    public void testIncrement() {
+        int i = 5;
+        assertEquals(12, ++i * 2);
+        assertEquals(6, i);
+
+        i = 5;
+        assertEquals(10, i++ * 2);
+        assertEquals(6, i);
+    }
+
 }

app/src/test/java/com/example/paktalin/agilejava/RosterReporterTest.java

 package com.example.paktalin.agilejava;
 
 import junit.framework.TestCase;
-
+import static com.example.paktalin.agilejava.RosterReporter.NEW_LINE;
 
 /**
  * Created by Paktalin on 17/05/2018.
@@ -10,7 +10,7 @@ import junit.framework.TestCase;
 public class RosterReporterTest extends TestCase {
 
     public void testRosterReport() {
-        CourseSession session = new CourseSession("ENGL", "101",
+        CourseSession session = CourseSession.create("ENGL", "101",
                 DateUtil.createDate(2003, 1, 6));
 
         session.enroll(new Student("A"));
@@ -21,9 +21,9 @@ public class RosterReporterTest extends TestCase {
 
         assertEquals(
                 RosterReporter.ROSTER_REPORT_HEADER +
-                        "A" + RosterReporter.NEW_LINE +
-                        "B" + RosterReporter.NEW_LINE +
+                        "A" + NEW_LINE +
+                        "B" + NEW_LINE +
                         RosterReporter.ROSTER_REPORT_FOOTER + "2" +
-                        RosterReporter.NEW_LINE, rosterReport);
+                        NEW_LINE, rosterReport);
     }
 }

app/src/test/java/com/example/paktalin/agilejava/StudentTest.java

@@ -18,4 +18,31 @@ public class StudentTest extends TestCase {
         Student secondStudent = new Student(secondStudentName);
         assertEquals(secondStudentName, secondStudent.getName());
     }
+
+    public void testStudentStatus() {
+        Student student = new Student("a");
+        assertEquals(0, student.getCredits());
+        assertFalse(student.isFullTime());
+
+        student.addCredits(3);
+        assertEquals(3, student.getCredits());
+        assertFalse(student.isFullTime());
+
+        student.addCredits(4);
+        assertEquals(7, student.getCredits());
+        assertFalse(student.isFullTime());
+
+        student.addCredits(5);
+        assertEquals(Student.CREDITS_REQUIRED_FOR_FULL_TIME, student.getCredits());
+        assertTrue("Not enough credits for FullTime status", student.isFullTime());
+    }
+
+    public void testInState() {
+        Student student = new Student("a");
+        assertFalse(student.isInState());
+        student.setState(Student.IN_STATE);
+        assertTrue(student.isInState());
+        student.setState("MD");
+        assertFalse(student.isInState());
+    }
 }