added function chaining for db query

backend/service/db/dbEvents_test.go

@@ -0,0 +1,42 @@
+package db
+
+import (
+	"github.com/pocketbase/dbx"
+	"htwkalender/model"
+	"reflect"
+	"testing"
+)
+
+func Test_buildIcalQueryForModules(t *testing.T) {
+	type args struct {
+		modules []model.FeedCollection
+	}
+	tests := []struct {
+		name string
+		args args
+		want dbx.Expression
+	}{
+		{
+			name: "empty modules",
+			args: args{modules: []model.FeedCollection{}},
+			want: dbx.HashExp{},
+		},
+		{
+			name: "one module",
+			args: args{modules: []model.FeedCollection{{Name: "test", Course: "test"}}},
+			want: dbx.And(dbx.HashExp{"Name": "test"}, dbx.HashExp{"course": "test"}),
+		},
+		{
+			name: "two modules",
+			args: args{modules: []model.FeedCollection{{Name: "test", Course: "test"}, {Name: "test2", Course: "test2"}}},
+			want: dbx.Or(dbx.And(dbx.HashExp{"Name": "test"}, dbx.HashExp{"course": "test"}), dbx.And(dbx.HashExp{"Name": "test2"}, dbx.HashExp{"course": "test2"})),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := buildIcalQueryForModules(tt.args.modules); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("buildIcalQueryForModules() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}