R Under development (unstable) (2023-10-08 r85282 ucrt) -- "Unsuffered Consequences"
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> library(grid)
> library(grImport2)
> library(gridSVG)

Attaching package: 'gridSVG'

The following objects are masked from 'package:grid':

    linearGradient, pattern, radialGradient

The following object is masked from 'package:grDevices':

    dev.off

> 
> pic <- readPicture("test-raster-input.svg")
> 
> ## This test is not run be default because it is sensitive to changes
> ## in the temporary PNG file that is created when exporting raster
> ## to SVG via 'gridSVG'
> notrun <- function() {
+ 
+     gridsvg("test-raster-output.svg", width = 6, height = 6, annotate = FALSE)
+     grid.picture(pic, expansion = 0)
+     dev.off()
+ 
+     model <- readLines("test-raster-output.svg.save")[-1]
+     test <- readLines("test-raster-output.svg")[-1]
+     same <- model == test
+     if (! all(same)) {
+         stop(paste0("raster output not equal to expected output",
+                     "------------------",
+                     model[!same],
+                     "------------------",
+                     test[!same],
+                     collapse="\n"))
+     }
+ }
> 
> 
> proc.time()
   user  system elapsed 
   0.60    0.06    0.68