Implement HW5 stubs, API helpers, optional SQL/MQ helpers, and test coverage

src/test/java/ru/otus/stub/tests/SqlHelperTest.java

@@ -0,0 +1,31 @@
+package ru.otus.stub.tests;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import ru.otus.stub.helper.SqlHelper;
+
+import java.util.List;
+import java.util.Map;
+
+class SqlHelperTest {
+
+    @Test
+    void shouldReadDataFromDatabase() {
+        final String jdbcUrl = "jdbc:h2:mem:stubdb;DB_CLOSE_DELAY=-1";
+        final SqlHelper sqlHelper = new SqlHelper(jdbcUrl, "sa", "");
+
+        sqlHelper.executeUpdate("""
+                CREATE TABLE IF NOT EXISTS users (
+                    id BIGINT PRIMARY KEY,
+                    name VARCHAR(100),
+                    score INT
+                )
+                """);
+        sqlHelper.executeUpdate("INSERT INTO users(id, name, score) VALUES (1, 'Test user', 78)");
+
+        final List<Map<String, Object>> rows = sqlHelper.selectRows("SELECT name, score FROM users WHERE id = 1");
+        Assertions.assertEquals(1, rows.size());
+        Assertions.assertEquals("Test user", rows.getFirst().get("NAME"));
+        Assertions.assertEquals(78, ((Number) rows.getFirst().get("SCORE")).intValue());
+    }
+}