Use Apache Commons Math for calculations and implement service tests

Implement TestResultService tests and supporting entity builders.
Switch to Apache Commons Math library for descriptive statistics.

1 files changed, 175 insertions, 0 deletions

diff --git a/src/test/java/com/stileeducation/markr/service/TestResultsServiceTest.java b/src/test/java/com/stileeducation/markr/service/TestResultsServiceTest.java
new file mode 100644
index 0000000..474d731
--- /dev/null
+++ b/src/test/java/com/stileeducation/markr/service/TestResultsServiceTest.java
@@ -0,0 +1,175 @@
+package com.stileeducation.markr.service;
+
+import com.stileeducation.markr.entity.Student;
+import com.stileeducation.markr.entity.TestResult;
+import com.stileeducation.markr.repository.StudentRepository;
+import com.stileeducation.markr.repository.TestRepository;
+import com.stileeducation.markr.repository.TestResultRepository;
+import com.stileeducation.markr.util.StudentBuilder;
+import com.stileeducation.markr.util.TestBuilder;
+import com.stileeducation.markr.util.TestResultBuilder;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+class TestResultsServiceTest {
+
+  private static Student student1;
+  private static Student student2;
+  private static Student student3;
+  private static Student student4;
+
+  private static com.stileeducation.markr.entity.Test test1;
+
+  private static TestResult testResult1;
+  private static TestResult testResult2;
+  private static TestResult testResult3;
+  private static TestResult testResult4;
+  private static TestResult testResult5;
+  private static TestResult testResult6;
+
+  private static List<TestResult> test1Results;
+
+  @Mock
+  private TestResultRepository testResultRepository;
+
+  @Mock
+  private StudentRepository studentRepository;
+
+  @Mock
+  private TestRepository testRepository;
+
+  @InjectMocks
+  private TestResultsService testResultsService;
+
+  @BeforeAll
+  static void setupTestData() {
+    student1 = new StudentBuilder()
+        .withId(1L)
+        .withStudentNumber("555123")
+        .withFirstName("Emily")
+        .withLastName("Clark")
+        .build();
+
+    student2 = new StudentBuilder()
+        .withId(2L)
+        .withStudentNumber("555456")
+        .withFirstName("James")
+        .withLastName("Taylor")
+        .build();
+
+    student3 = new StudentBuilder()
+        .withId(3L)
+        .withStudentNumber("555789")
+        .withFirstName("Sophia")
+        .withLastName("Martinez")
+        .build();
+
+    student4 = new StudentBuilder()
+        .withId(4L)
+        .withStudentNumber("555012")
+        .withFirstName("Liam")
+        .withLastName("Anderson")
+        .build();
+
+    test1 = new TestBuilder()
+        .withId(1L)
+        .withTestId("1234")
+        .withMarksAvailable(100)
+        .build();
+
+    testResult1 = new TestResultBuilder()
+        .withStudent(student1)
+        .withTest(test1)
+        .withMarksAwarded(10)
+        .build();
+
+    testResult2 = new TestResultBuilder()
+        .withStudent(student2)
+        .withTest(test1)
+        .withMarksAwarded(20)
+        .build();
+
+    testResult3 = new TestResultBuilder()
+        .withStudent(student3)
+        .withTest(test1)
+        .withMarksAwarded(40)
+        .build();
+
+    testResult4 = new TestResultBuilder()
+        .withStudent(student4)
+        .withTest(test1)
+        .withMarksAwarded(50)
+        .build();
+
+    testResult5 = new TestResultBuilder()
+        .withStudent(student3)
+        .withTest(test1)
+        .withMarksAwarded(70)
+        .build();
+
+    testResult6 = new TestResultBuilder()
+        .withStudent(student4)
+        .withTest(test1)
+        .withMarksAwarded(80)
+        .build();
+
+    test1Results = List.of(testResult1, testResult2, testResult3, testResult4, testResult5, testResult6);
+  }
+
+  @BeforeEach
+  void setUp() {
+    MockitoAnnotations.openMocks(this);
+  }
+
+  @Test
+  void calculateMeanOfTestResults() {
+    double mean = testResultsService.calculateMeanOfTestResults(test1Results);
+    assertEquals(45.0, mean, 0.01);
+  }
+
+  @Test
+  void calculateMinOfTestResults() {
+    double min = testResultsService.calculateMinOfTestResults(test1Results);
+    assertEquals(10.0, min, 0.01);
+  }
+
+  @Test
+  void calculateMaxOfTestResults() {
+    double max = testResultsService.calculateMaxOfTestResults(test1Results);
+    assertEquals(80.0, max, 0.01);
+  }
+
+  @Test
+  void calculateStandardDeviationOfTestResults() {
+    double standardDeviationOfTestResults = testResultsService.calculateStandardDeviationOfTestResults(test1Results);
+    assertEquals(25, standardDeviationOfTestResults, 0.01);
+  }
+
+  @Test
+  void calculate25thPercentile() {
+    double percentile = testResultsService.calculate25thPercentile(test1Results);
+    assertEquals(17.5, percentile, 0.01);
+  }
+
+  @Test
+  void calculate50thPercentile() {
+    double percentile = testResultsService.calculate50thPercentile(test1Results);
+    assertEquals(45, percentile, 0.01);
+  }
+
+  @Test
+  void calculate75thPercentile() {
+    double percentile = testResultsService.calculate75thPercentile(test1Results);
+    assertEquals(72.5, percentile, 0.01);
+  }
+
+}
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