ghost/core/server/config/env/config.testing.json

{
    "url": "http://127.0.0.1:2369",
    "database": {
        "connection": {
            "filename": "content/data/ghost-test.db"
        },
        "useNullAsDefault": true
    },
    "server": {
        "port": 2369
    },
    "logging": false
}