(#10) Added extra unit tests for PsdfUtil

src/main/java/tech/fastj/graphics/util/PsdfUtil.java

@@ -40,10 +40,10 @@ public class PsdfUtil {
     public static Polygon2D[] loadPsdf(String fileLocation) {
         // check for correct file extension
         if (!fileLocation.substring(fileLocation.lastIndexOf(".") + 1).equalsIgnoreCase("psdf")) {
-            FastJEngine.error(PsdfReadErrorMessage,
-                    new IllegalArgumentException("Unsupported file type."
+            throw new IllegalArgumentException(
+                    "Unsupported file type."
                             + System.lineSeparator()
-                            + "This engine currently only supports files of the extension \".psdf\".")
+                            + "This engine currently only supports files of the extension \".psdf\"."
             );
         }
 

src/test/java/unittest/testcases/graphics/util/PsdfUtilTests.java

@@ -14,9 +14,11 @@
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
 import java.nio.file.Path;
 import java.util.Comparator;
 import java.util.List;
+import java.util.UUID;
 import java.util.stream.Stream;
 
 import org.junit.jupiter.api.AfterAll;
@@ -28,6 +30,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 class PsdfUtilTests {
@@ -137,4 +140,25 @@ void checkReadPsdf_shouldMatchOriginal() {
         assertArrayEquals(expectedHouseArray, actualHouseArray, "The actual Polygon2D array should match the expected array.");
         assertEquals(expectedHouse, actualHouse, "The actual Model2D should match the expected Model2D.");
     }
+
+    @Test
+    void tryReadPsdf_withIncorrectFileExtension() {
+        String invalid_path = UUID.randomUUID() + ".notsupported";
+        Throwable exception = assertThrows(IllegalArgumentException.class, () -> PsdfUtil.loadPsdf(invalid_path));
+
+        String expectedExceptionMessage = "Unsupported file type."
+                + System.lineSeparator()
+                + "This engine currently only supports files of the extension \".psdf\".";
+        assertEquals(expectedExceptionMessage, exception.getMessage(), "The thrown exception's message should match the expected exception message.");
+    }
+
+    @Test
+    void tryReadPsdf_withFileThatDoesNotExist() {
+        String invalid_pathThatDoesNotResolveToFile = UUID.randomUUID() + ".psdf";
+
+        Throwable exception = assertThrows(IllegalStateException.class, () -> PsdfUtil.loadPsdf(invalid_pathThatDoesNotResolveToFile)).getCause();
+        assertEquals(NoSuchFileException.class, exception.getClass(), "The exception's class should match the expected class.");
+
+        assertEquals(invalid_pathThatDoesNotResolveToFile, exception.getMessage(), "The thrown exception's message should match the expected exception message.");
+    }
 }