Add test cases for "g/G" with special float values

Author: R3G3N3R4T0R

test/fmtspec.jl

@@ -407,18 +407,24 @@ end
 
     @test pyfmt("f", NaN) == "NaN"
     @test pyfmt("e", NaN) == "NaN"
+    @test pyfmt("g", NaN) == "NaN"
     @test pyfmt("f", NaN32) == "NaN"
     @test pyfmt("e", NaN32) == "NaN"
+    @test pyfmt("g", NaN32) == "NaN"
 
     @test pyfmt("f", Inf) == "Inf"
     @test pyfmt("e", Inf) == "Inf"
+    @test pyfmt("g", Inf) == "Inf"
     @test pyfmt("f", Inf32) == "Inf"
     @test pyfmt("e", Inf32) == "Inf"
+    @test pyfmt("g", Inf32) == "Inf"
 
     @test pyfmt("f", -Inf) == "-Inf"
     @test pyfmt("e", -Inf) == "-Inf"
+    @test pyfmt("g", -Inf) == "-Inf"
     @test pyfmt("f", -Inf32) == "-Inf"
     @test pyfmt("e", -Inf32) == "-Inf"
+    @test pyfmt("g", -Inf32) == "-Inf"
 
     @test pyfmt("<5f", Inf) == "Inf  "
     @test pyfmt("^5f", Inf) == " Inf "