R version 3.6.2 Patched (2020-02-12 r77795) -- "Dark and Stormy Night"
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Platform: x86_64-pc-linux-gnu (64-bit)

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> ## tests of the fonts in the postscript() device.
> 
> testit <- function(family, encoding="default")
+ { 
+     postscript("ps-tests.ps", height=7, width=7, family=family,
+                encoding=encoding)
+     plot(1:10, type="n")
+     text(5, 9, "Some text")
+     text(5, 8 , expression(italic("italic")))
+     text(5, 7 , expression(bold("bold")))
+     text(5, 6 , expression(bolditalic("bold & italic")))
+     text(8, 3, expression(paste(frac(1, sigma*sqrt(2*pi)), " ",
+         plain(e)^{frac(-(x-mu)^2, 2*sigma^2)})))
+     dev.off()
+ }
> 
> testit("Helvetica")
null device 
          1 
> testit("AvantGarde")
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> testit("Bookman")
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> testit("Courier")
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> testit("Helvetica-Narrow")
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> testit("NewCenturySchoolbook")
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> testit("Palatino")
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> testit("Times")
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          1 
> 
> testit("URWGothic")
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> testit("URWBookman")
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> testit("NimbusMon")
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> testit("NimbusSan")
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> testit("NimbusSanCond")
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> testit("CenturySch")
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> testit("URWPalladio")
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> testit("NimbusRom")
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> testit("URWHelvetica")
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> testit("URWTimes")
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> 
> testit("ComputerModern", "TeXtext.enc")
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          1 
> 
> unlink("ps-tests.ps")
> 
> proc.time()
   user  system elapsed 
  0.503   0.054   0.534