test[DbWrapper]: add testing for SQLException

src/test/java/edu/group5/app/model/wrapper/DbWrapperDonationsTest.java

@@ -7,6 +7,7 @@
 
 import java.math.BigDecimal;
 import java.math.RoundingMode;
+import java.sql.SQLException;
 import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -25,12 +26,14 @@ public class DbWrapperDonationsTest {
   private Object[] cutoffDonation;
   private Object[] freakyDonation;
   private Object[] repeatingDonation;
+  private Object[] tooBigDonation;
   private List<Object[]> donations;
   private List<Object[]> donations2;
   private List<Object[]> donations3;
   private List<Object[]> repeatedDonations;
   private List<Object[]> wrongFormatDonations;
   private List<Object[]> wrongDatatypeDonations;
+  private List<Object[]> tooBigDonations;
   private List<Object[]> nullList;
 
   private static final int PRECISION = 5;
@@ -40,10 +43,10 @@ public class DbWrapperDonationsTest {
   @BeforeEach
   void init() {
     this.db = new DbWrapper(true);
-    String[] firstNames = new String[] { "John", "Jane", "Cutoff", "Freaky", "Repeating" };
-    String[] lastNames = new String[] { "Doe", "Doe", "Joh", "Bill", "JoeJoe" };
+    String[] firstNames = new String[] { "John", "Jane", "Cutoff", "Freaky", "Repeating", "Big" };
+    String[] lastNames = new String[] { "Doe", "Doe", "Joh", "Bill", "JoeJoe", "Willy" };
     this.users = new ArrayList<Object[]>();
-    for (int i = 0; i < 5; i++) {
+    for (int i = 0; i < firstNames.length; i++) {
       Object[] row = new Object[6];
       row[0] = i + 1;
       row[1] = "Customer";
@@ -84,6 +87,13 @@ void init() {
     this.wrongDatatypeDonations = new ArrayList<Object[]>();
     this.wrongDatatypeDonations.add(freakyDonation);
 
+    this.tooBigDonation = new Object[] {
+      6, 6, 999999, new BigDecimal("9999999999999999999999999999999"),
+      new Timestamp(new Date().getTime()), "Azerbaijani technologies"
+    };
+    this.tooBigDonations = new ArrayList<Object[]>();
+    this.tooBigDonations.add(tooBigDonation);
+
     Object[] nullRow = new Object[] {null, null, null, null, null, null};
     this.nullList = new ArrayList<Object[]>();
     this.nullList.add(nullRow);
@@ -150,7 +160,7 @@ public void wronglyDatatypedDonationsThrowsExpectedException() {
   @Test
   public void addingSameDonationTwiceThrowsExpectedException() {
     assertTrue(this.db.importDonations((int) this.users.get(0)[0]).size() == 0);
-    assertEquals(1, this.db.exportDonations(this.donations));
+    assertDoesNotThrow(() -> assertEquals(1, this.db.exportDonations(this.donations)));
     IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {
       this.db.exportDonations(this.donations);
     });
@@ -163,7 +173,7 @@ public void addingSameDonationTwiceThrowsExpectedException() {
   public void addingSameDonationTwiceThrowsExpectedException2() {
     assertTrue(this.db.importDonations((int) this.users.get(0)[0]).size() == 0); 
     assertTrue(this.db.importDonations((int) this.users.get(1)[0]).size() == 0);
-    assertEquals(2, this.db.exportDonations(this.donations2));
+    assertDoesNotThrow(() -> assertEquals(2, this.db.exportDonations(this.donations2)));
     IllegalArgumentException exception = assertThrows(
         IllegalArgumentException.class,
         () -> {
@@ -212,8 +222,20 @@ public void addingDonationListWithNullInRowThrowsExpectedException() {
   @Test
   public void dataIsEmptyAfterExportingAndImportingEmptyList() {
     assertTrue(this.db.importDonations((int) this.users.get(0)[0]).size() == 0);
-    assertEquals(0, this.db.exportDonations(new ArrayList<Object[]>()));
+    assertDoesNotThrow(() -> assertEquals(0, this.db.exportDonations(new ArrayList<Object[]>())));
     assertTrue(this.db.importDonations((int) this.users.get(0)[0]).size() == 0);
     assertTrue(this.db.disconnect());
   }
+
+  @Test
+  public void exportTooBigNumberThrowsSQLException() {
+    SQLException exception = assertThrows(SQLException.class, () -> {
+      this.db.exportDonations(this.tooBigDonations);
+    });
+    assertEquals(
+        "An unexpected SQL exception has occurred. " +
+        "This might be caused by inserting an item that is too large.",
+        exception.getMessage()
+    );
+  }
 }