Issue #195: Changed assertj assertions to junit and hamcrest assertions in grade-school. Removed assertj from grade-school gradle build file. (#211)

exercises/grade-school/build.gradle

 
 dependencies {
   testCompile "junit:junit:4.12"
-  testCompile "org.assertj:assertj-core:3.2.0"
 }
 test {
   testLogging {

exercises/grade-school/src/test/java/SchoolTest.java

-import static org.assertj.core.api.Assertions.assertThat;
-
-import org.junit.Test;
 import org.junit.Ignore;
+import org.junit.Test;
 
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
 public class SchoolTest {
   private final School school = new School();
 
 
   @Test
   public void startsWithNoStudents() {
-    assertThat(school.db()).isEmpty();
+    assertTrue(school.db().isEmpty());
   }
 
   @Ignore
   @Test
   public void addsStudents() {
     school.add("Aimee", 2);
-    assertThat(school.db().get(2)).contains("Aimee");
+    assertThat(school.db().get(2), hasItem("Aimee"));
   }
 
   @Ignore
     school.add("Blair", grade);
     school.add("Paul", grade);
 
-    assertThat(school.db().get(grade)).hasSize(3).contains("James", "Blair", "Paul");
+    assertThat(school.db().get(grade).size(), is(3));
+    assertThat(school.db().get(grade), allOf(hasItem("James"), hasItem("Blair"), hasItem("Paul")));
   }
 
   @Ignore
     school.add("Chelsea", 3);
     school.add("Logan", 7);
 
-    assertThat(school.db()).hasSize(2);
-    assertThat(school.db().get(3)).hasSize(1).contains("Chelsea");
-    assertThat(school.db().get(7)).hasSize(1).contains("Logan");
+    assertThat(school.db().size(), is(2));
+    assertThat(school.db().get(3).size(), is(1));
+    assertThat(school.db().get(3), hasItem("Chelsea"));
+    assertThat(school.db().get(7).size(), is(1));
+    assertThat(school.db().get(7), hasItem("Logan"));
   }
 
   @Ignore
     school.add("Franklin", 5);
     school.add("Bradley", 5);
     school.add("Jeff", 1);
-    assertThat(school.grade(5)).hasSize(2).contains("Franklin", "Bradley");
+    assertThat(school.grade(5).size(), is(2));
+    assertThat(school.grade(5), allOf(hasItem("Franklin"), hasItem("Bradley")));
   }
 
   @Ignore
   @Test
   public void getsStudentsInEmptyGrade() {
-    assertThat(school.grade(1)).isEmpty();
+    assertTrue(school.grade(1).isEmpty());
   }
 
   @Ignore
     sortedStudents.put(6, Arrays.asList("Kareem"));
     sortedStudents.put(4, Arrays.asList("Christopher", "Jennifer"));
     sortedStudents.put(3, Arrays.asList("Kyle"));
-
-    assertThat(school.sort()).isEqualTo(sortedStudents);
+    assertEquals(school.sort(), sortedStudents);
   }
 }