UserDatabaseTest.java

package com.example.database;

import org.junit.Test;
import org.junit.Before;
import static org.junit.Assert.*;

/**
 * Unit tests for UserDatabase class
 * Note: These tests verify the methods execute without crashing.
 * Actual database connections will fail in test environment, which is expected.
 */
public class UserDatabaseTest {
    
    private UserDatabase userDatabase;
    
    @Before
    public void setUp() {
        userDatabase = new UserDatabase();
    }
    
    @Test
    public void testUserDatabaseCreation() {
        assertNotNull("UserDatabase should be created", userDatabase);
    }
    
    @Test
    public void testAuthenticateUserDoesNotCrash() {
        // Should handle database connection failure gracefully
        boolean result = userDatabase.authenticateUser("testuser", "testpass");
        assertFalse("Authentication should fail without database", result);
    }
    
    @Test
    public void testAuthenticateUserWithEmptyUsername() {
        boolean result = userDatabase.authenticateUser("", "password");
        assertFalse("Authentication with empty username should fail", result);
    }
    
    @Test
    public void testAuthenticateUserWithEmptyPassword() {
        boolean result = userDatabase.authenticateUser("username", "");
        assertFalse("Authentication with empty password should fail", result);
    }
    
    @Test
    public void testAuthenticateUserWithSpecialCharacters() {
        // Testing with SQL injection attempt
        boolean result = userDatabase.authenticateUser("admin' OR '1'='1", "password");
        assertFalse("Authentication should fail without database", result);
    }
    
    @Test
    public void testAuthenticateUserWithQuotes() {
        boolean result = userDatabase.authenticateUser("test'user", "test'pass");
        assertFalse("Authentication with quotes should fail without database", result);
    }
    
    @Test
    public void testUpdateUserProfileDoesNotCrash() {
        // Should handle database connection failure gracefully
        try {
            userDatabase.updateUserProfile("1", "test@example.com", "Test User");
            // If no exception is thrown, test passes
            assertTrue("Update method should complete", true);
        } catch (Exception e) {
            fail("Update method should not throw exception: " + e.getMessage());
        }
    }
    
    @Test
    public void testUpdateUserProfileWithEmptyValues() {
        try {
            userDatabase.updateUserProfile("", "", "");
            assertTrue("Update with empty values should complete", true);
        } catch (Exception e) {
            fail("Update with empty values should not throw exception");
        }
    }
    
    @Test
    public void testUpdateUserProfileWithSpecialCharacters() {
        try {
            userDatabase.updateUserProfile("1", "test@example.com", "O'Brien");
            assertTrue("Update with special characters should complete", true);
        } catch (Exception e) {
            fail("Update with special characters should not throw exception");
        }
    }
    
    @Test
    public void testUpdateUserProfileWithLongValues() {
        String longEmail = "verylongemailaddress" + "@".repeat(10) + "example.com";
        String longName = "A".repeat(100);
        try {
            userDatabase.updateUserProfile("1", longEmail, longName);
            assertTrue("Update with long values should complete", true);
        } catch (Exception e) {
            fail("Update with long values should not throw exception");
        }
    }
    
    @Test
    public void testDeleteUserDoesNotCrash() {
        try {
            userDatabase.deleteUser("1");
            assertTrue("Delete method should complete", true);
        } catch (Exception e) {
            fail("Delete method should not throw exception: " + e.getMessage());
        }
    }
    
    @Test
    public void testDeleteUserWithEmptyId() {
        try {
            userDatabase.deleteUser("");
            assertTrue("Delete with empty ID should complete", true);
        } catch (Exception e) {
            fail("Delete with empty ID should not throw exception");
        }
    }
    
    @Test
    public void testDeleteUserWithSpecialCharacters() {
        try {
            userDatabase.deleteUser("1' OR '1'='1");
            assertTrue("Delete with special characters should complete", true);
        } catch (Exception e) {
            fail("Delete with special characters should not throw exception");
        }
    }
    
    @Test
    public void testDeleteUserWithNonNumericId() {
        try {
            userDatabase.deleteUser("abc");
            assertTrue("Delete with non-numeric ID should complete", true);
        } catch (Exception e) {
            fail("Delete with non-numeric ID should not throw exception");
        }
    }
    
    @Test
    public void testMultipleOperationsSequence() {
        // Test that multiple operations can be called in sequence
        try {
            userDatabase.authenticateUser("user1", "pass1");
            userDatabase.updateUserProfile("1", "email@test.com", "Name");
            userDatabase.deleteUser("2");
            assertTrue("Multiple operations should complete", true);
        } catch (Exception e) {
            fail("Multiple operations should not throw exception");
        }
    }
}