fix tests

Author: meggart

src/datasets/datasetinterface.jl

@@ -16,8 +16,7 @@ function get_global_attrs(ds) end
 
 #Functions to be implemented for Dataset sinks
 "Initialize and return a handle to a new empty dataset"
-create_empty(T::Type,path) =
-  error("create_empty not implemented for $T")
+function create_empty(T::Type,path,gatts) end
 
 """
     add_var(ds, T, name, s, dimlist, atts)

src/datasets/netcdf.jl

@@ -52,7 +52,7 @@ function add_var(p::NetCDFDataset, T::Type, varname, s, dimnames, attr;
   NetCDFVariable{T,length(s)}(p.filename,varname,(s...,))
 end
 
-function create_empty(::Type{NetCDFDataset}, path, gatts)
+function create_empty(::Type{NetCDFDataset}, path, gatts=Dict())
   NetCDF.create(_->nothing, path, NcVar[], gatts = gatts)
   NetCDFDataset(path)
 end

src/datasets/zarr.jl

@@ -34,7 +34,7 @@ function add_var(p::ZarrDataset, a::AbstractArray, varname, dimnames, attr;
   a
 end
 
-create_empty(::Type{ZarrDataset}, path, gatts) = ZarrDataset(zgroup(path, attrs=gatts))
+create_empty(::Type{ZarrDataset}, path, gatts=Dict()) = ZarrDataset(zgroup(path, attrs=gatts))
 
 backendlist[:zarr] = ZarrDataset
 push!(backendregex, r"(.zarr$)|(.zarr/$)"=>ZarrDataset)