test: other cg converter tests

honestly these tests are super barebones but i mean
they're good enough. I hate writing tests.

server/src/test-utils/mock-db/charts-museca.json

@@ -0,0 +1,20 @@
+[
+	{
+		"chartID": "70b80da02a2037d556026b412c386b2fd1e57dbd",
+		"data": {
+			"inGameID": 1
+		},
+		"difficulty": "Green",
+		"isPrimary": true,
+		"level": "3",
+		"levelNum": 3,
+		"playtype": "Single",
+		"rgcID": null,
+		"songID": 1,
+		"tierlistInfo": {},
+		"versions": [
+			"1.5",
+			"1.5-b"
+		]
+	}
+]

server/src/test-utils/mock-db/songs-museca.json

@@ -0,0 +1,14 @@
+[
+	{
+		"altTitles": [],
+		"artist": "Last Note. feat. GUMI",
+		"data": {
+			"artistJP": "ﾗｽﾄﾉｰﾄﾌｨｰﾁｬﾘﾝｸﾞｸﾞﾐ",
+			"displayVersion": "1",
+			"titleJP": "ｾﾂﾅﾄﾘｯﾌﾟ"
+		},
+		"id": 1,
+		"searchTerms": [],
+		"title": "セツナトリップ"
+	}
+]