Added Class.getTests()

lib/Class.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const DatabaseConnectionPool = require('./DatabaseConnectionPool');
+const Test = require('./Test');
 
 class Class {
 	/**
@@ -109,8 +110,45 @@ class Class {
 		return Promise.all(teacherPromises);
 	}
 
-	get tests() {
+	async getTests({ order='desc', range='all' } = {}) {
+		const validOrder = [ 'asc', 'desc' ];
+		const validRange = [ 'all', 'before', 'after' ];
 
+		if (!validOrder.includes(order))
+			throw new Error('Invalid order');
+
+		if (!validRange.includes(range))
+			throw new Error('Invalid range');
+
+		let sql = `
+			select
+				t.testId as testId
+			from
+				class c
+				join test t using(classId)
+			where
+				c.classId = ?
+		`;
+
+		switch (range) {
+			case 'before':
+				sql += 'and t.testDate <= curdate()';
+				break;
+			case 'after':
+				sql += 'and t.testDate > curdate()';
+				break;
+		}
+
+		sql += `order by t.testDate  ${order};`;
+
+		const conn = await new DatabaseConnectionPool();
+		const tests = await conn.runQuery(sql, [ this.id ]);
+
+		const testObjects = tests.map(test => {
+			return new Test(test.testId);
+		});
+
+		return await Promise.all(testObjects);
 	}
 
 	get students() {