Add gorm tests

Author: egregius313

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/test_gorm.go

@@ -0,0 +1,45 @@
+package test
+
+import "gorm.io/gorm"
+
+type User struct{}
+
+// test querying an Association
+func test_gorm_AssociationQuery(association *gorm.Association) {
+	association.Find(&User{}) // $ source
+}
+
+// test querying a ConnPool
+func test_gorm_ConnPoolQuery(connPool gorm.ConnPool) {
+	rows, err := connPool.QueryContext(nil, "SELECT * FROM users") // $ source
+
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	userRow := connPool.QueryRowContext(nil, "SELECT * FROM users WHERE id = 1") // $ source
+
+	ignore(userRow)
+}
+
+// test querying a DB
+func test_gorm_db(db *gorm.DB) {
+	db.Find(&User{}) // $ source
+
+	db.FindInBatches(&User{}, 10, nil) // $ source
+
+	db.FirstOrCreate(&User{}) // $ source
+
+	db.FirstOrInit(&User{}) // $ source
+
+	db.First(&User{}) // $ source
+
+	db.Last(&User{}) // $ source
+
+	db.Take(&User{}) // $ source
+
+	db.Scan(&User{}) // $ source
+
+}