fix test on windows

test/apps.jl

@@ -11,11 +11,12 @@ isolate(loaded_depot=true) do
     sep = Sys.iswindows() ? ';' : ':'
     Pkg.Apps.develop(path=joinpath(@__DIR__, "test_packages", "Rot13.jl"))
     current_path = ENV["PATH"]
+    exename = Sys.iswindows() ? "rot13.bat" : "rot13"
     withenv("PATH" => string(joinpath(first(DEPOT_PATH), "bin"), sep, current_path)) do
-        @test contains(Sys.which("rot13"), first(DEPOT_PATH))
-        @test read(`rot13 test`, String) == "grfg\n"
+        @test contains(Sys.which("$exename"), first(DEPOT_PATH))
+        @test read(`$exename test`, String) == "grfg\n"
         Pkg.Apps.rm("Rot13")
-        @test Sys.which("rot13") == nothing
+        @test Sys.which(exename) == nothing
     end
 end
 
@@ -24,13 +25,13 @@ isolate(loaded_depot=true) do
         sep = Sys.iswindows() ? ';' : ':'
         path = git_init_package(tmpdir, joinpath(@__DIR__, "test_packages", "Rot13.jl"))
         Pkg.Apps.add(path=path)
-
+        exename = Sys.iswindows() ? "rot13.bat" : "rot13"
         current_path = ENV["PATH"]
         withenv("PATH" => string(joinpath(first(DEPOT_PATH), "bin"), sep, current_path)) do
-            @test contains(Sys.which("rot13"), first(DEPOT_PATH))
-            @test read(`rot13 test`, String) == "grfg\n"
+            @test contains(Sys.which(exename), first(DEPOT_PATH))
+            @test read(`$exename test`, String) == "grfg\n"
             Pkg.Apps.rm("Rot13")
-            @test Sys.which("rot13") == nothing
+            @test Sys.which(exename) == nothing
         end
     end
 end