tests:
    -
        description: "Default"
        uri: "mongodb://localhost/"
        valid: true
        warning: false
        writeConcern: { }
    -
        description: "w as a valid number"
        uri: "mongodb://localhost/?w=1"
        valid: true
        warning: false
        writeConcern: { w: 1 }
    -
        description: "w as an invalid number"
        uri: "mongodb://localhost/?w=-2"
        valid: false
        warning: ~
    -
        description: "w as a string"
        uri: "mongodb://localhost/?w=majority"
        valid: true
        warning: false
        writeConcern: { w: "majority" }
    -
        description: "wtimeoutMS as a valid number"
        uri: "mongodb://localhost/?wtimeoutMS=500"
        valid: true
        warning: false
        writeConcern: { wtimeoutMS: 500 }
    -
        description: "wtimeoutMS as an invalid number"
        uri: "mongodb://localhost/?wtimeoutMS=-500"
        valid: false
        warning: ~
    -
        description: "journal as false"
        uri: "mongodb://localhost/?journal=false"
        valid: true
        warning: false
        writeConcern: { journal: false }
    -
        description: "journal as true"
        uri: "mongodb://localhost/?journal=true"
        valid: true
        warning: false
        writeConcern: { journal: true }
    -
        description: "All options combined"
        uri: "mongodb://localhost/?w=3&wtimeoutMS=500&journal=true"
        valid: true
        warning: false
        writeConcern: { w: 3, wtimeoutMS: 500, journal: true }
    -
        description: "Unacknowledged with w"
        uri: "mongodb://localhost/?w=0"
        valid: true
        warning: false
        writeConcern: { w: 0 }
    -
        description: "Unacknowledged with w and journal"
        uri: "mongodb://localhost/?w=0&journal=false"
        valid: true
        warning: false
        writeConcern: { w: 0, journal: false }
    -
        description: "Unacknowledged with w and wtimeoutMS"
        uri: "mongodb://localhost/?w=0&wtimeoutMS=500"
        valid: true
        warning: false
        writeConcern: { w: 0, wtimeoutMS: 500 }
    -
        description: "Acknowledged with w as 0 and journal true"
        uri: "mongodb://localhost/?w=0&journal=true"
        valid: false
        warning: false
        writeConcern: { w: 0, journal: true }