Create BackupNotFoundExceptionTest.java

app/proprietary/src/test/java/stirling/software/proprietary/security/model/exception/BackupNotFoundExceptionTest.java

@@ -0,0 +1,30 @@
+package stirling.software.proprietary.security.model.exception;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class BackupNotFoundExceptionTest {
+
+    @Test
+    void constructor_setsMessage() {
+        BackupNotFoundException ex = new BackupNotFoundException("not found");
+        assertEquals("not found", ex.getMessage());
+        assertNull(ex.getCause(), "No cause expected for single-arg constructor");
+    }
+
+    @Test
+    void isRuntimeException() {
+        BackupNotFoundException ex = new BackupNotFoundException("x");
+        assertTrue(ex instanceof RuntimeException, "Should extend RuntimeException");
+    }
+
+    @Test
+    void canBeThrownAndCaught() {
+        try {
+            throw new BackupNotFoundException("missing backup");
+        } catch (BackupNotFoundException ex) {
+            assertEquals("missing backup", ex.getMessage());
+        }
+    }
+}