Check values for columns that are not accepting null values.
Language: Java
Framework: JUnit using JDBC
1Assuming the following details about the application and environment:2- The application is a web-based system that uses MySQL as its database.3- The database has a table named "users" that has several columns, some of which do not allow null values.4- The testing environment includes a MySQL server that is accessible via JDBC.56Here is the code to implement the test case using JUnit and JDBC in Java:78```9import java.sql.Connection;10import java.sql.DriverManager;11import java.sql.ResultSet;12import java.sql.SQLException;13import java.sql.Statement;1415import org.junit.After;16import org.junit.Before;17import org.junit.Test;18import static org.junit.Assert.fail;1920public class DatabaseTest {2122 private Connection conn;2324 @Before25 public void setUp() throws SQLException {26 // Connect to the database27 String url = "jdbc:mysql://localhost:3306/mydb";28 String user = "myuser";29 String password = "mypwd";30 conn = DriverManager.getConnection(url, user, password);31 }3233 @After34 public void tearDown() throws SQLException {35 // Close the database connection36 conn.close();37 }3839 @Test40 public void testNonNullValues() {41 try {42 // Create a statement to query the users table43 Statement stmt = conn.createStatement();44 String query = "SELECT * FROM users";45 ResultSet rs = stmt.executeQuery(query);4647 // Iterate over the result set and check for null values48 while (rs.next()) {49 String username = rs.getString("username");50 String password = rs.getString("password");51 String email = rs.getString("email");52 String name = rs.getString("name");5354 // Check for null values in columns that do not allow null55 if (username == null || password == null) {56 fail("Null value found in non-null column");57 }58 // Assume that email and name columns allow null59 // so we don't need to check for them60 }61 } catch (SQLException e) {62 fail("SQL exception occurred: " + e.getMessage());63 }64 }6566 // Uncomment the code below to run the test on a remote client with desired capabilities67 /*68 @Before69 public void setUpRemote() throws MalformedURLException {70 DesiredCapabilities cap = new DesiredCapabilities();71 cap.setBrowserName("Chrome");72 RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), cap);73 // Use the driver to navigate to the web app and perform the test74 }75 */76}77```7879In the code, we first connect to the database in the `setUp()` method and close the connection in the `tearDown()` method using JDBC. Then, we define a test method `testNonNullValues()` that queries the `users` table and checks for null values in columns that do not allow null. If a null value is found, the test fails using JUnit's `fail()` method.8081To run the test on a remote client with desired capabilities, we can uncomment the `setUpRemote()` method and use Selenium's `RemoteWebDriver` class to connect to the remote client. We assume that the remote client is running a Selenium Grid hub on `http://localhost:4444/wd/hub` and that it has Chrome browser installed. We can then use the driver to navigate to the web app and perform the test. However, we have not been provided with any specific web app so we cannot provide the exact code for that scenario.
Language: Python
Framework: Pytest
1#Assuming we have a database named 'example_db' with a table 'example_table' 2#that contains columns which do not accept null values.34import pytest5import mysql.connector67#Assume the connection details of the database8db_config = {9 'host': 'localhost',10 'user': 'root',11 'password': 'password',12 'database': 'example_db'13}1415#Assuming we have a function that returns a cursor object for the database connection16def get_db_cursor():17 try:18 db_conn = mysql.connector.connect(**db_config)19 cursor = db_conn.cursor()20 return cursor21 except:22 print("Database connection failed.")23 return None2425#Assuming we have a function that executes a SQL query string26#using the database cursor object27def execute_query(query_string):28 try:29 cursor = get_db_cursor()30 cursor.execute(query_string)31 return cursor.fetchall()32 except:33 print("Query execution failed.")34 return None3536#pytest function to check for null values in non-null columns37def test_null_values():38 #Assume we have a list of column names which do not accept null values39 non_null_columns = ['column_1', 'column_2', 'column_3']4041 query_string = "SELECT * FROM example_table WHERE "42 for column in non_null_columns:43 query_string += column + " IS NULL OR "4445 #Remove the last 'OR' from the query string46 query_string = query_string[:-4]4748 #Execute the query and check if any rows are returned49 result = execute_query(query_string)50 assert not result, "Error: Null values found in non-null columns!" 5152 #To run the test case on a remote client with the desired capabilities53 """54 from selenium.webdriver import Remote55 desired_capabilities = {'browserName': 'chrome', 'version': '', 'platform': 'ANY'}56 driver = Remote(command_executor='http://localhost:4444/wd/hub',57 desired_capabilities=desired_capabilities)58 #Use the driver object to automate the browser and perform necessary actions59 """60 #Add any necessary assumptions to the code above as comments.
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