Test Cthulhu extension

`ascend` is a terminal program so it takes a bit of effort to test it.

xref JuliaDebug/Cthulhu.jl#581

.github/workflows/ci.yml

@@ -49,6 +49,7 @@ jobs:
       - run: julia --project -e 'using Pkg; Pkg.develop([PackageSpec(path="SnoopCompileCore")])'
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
+      - run: julia  --check-bounds=yes --project -e 'using Pkg; Pkg.test(; test_args=["cthulhu"], coverage=true)'
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: src,SnoopCompileCore/src

Project.toml

@@ -43,6 +43,7 @@ PyPlot = "2"
 Random = "1"
 Serialization = "1"
 SnoopCompileCore = "3"
+REPL = "1"
 Test = "1"
 YAML = "0.4"
 julia = "1.10"
@@ -55,7 +56,8 @@ MethodAnalysis = "85b6ec6f-f7df-4429-9514-a64bcd9ee824"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 PrettyTables = "08abe8d2-0d0c-5749-adfa-8a2ac140af0d"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Cthulhu", "PrettyTables", "Documenter", "JET", "MethodAnalysis", "Pkg", "Random", "Test"]
+test = ["Cthulhu", "PrettyTables", "Documenter", "JET", "MethodAnalysis", "Pkg", "Random", "REPL", "Test"]

test/extensions/cthulhu.jl

@@ -0,0 +1,91 @@
+module CthulhuExtTest
+
+using SnoopCompileCore, SnoopCompile
+using Cthulhu
+using Pkg
+using Test
+
+if !isdefined(@__MODULE__, :fake_terminal)
+    @eval (@__MODULE__) begin
+        Base.include(@__MODULE__, normpath(pkgdir(Cthulhu), "test", "FakeTerminals.jl"))
+        using .FakeTerminals
+    end
+end
+
+macro with_try_stderr(out, expr)
+    quote
+        try
+            $(esc(expr))
+        catch err
+            bt = catch_backtrace()
+            Base.display_error(stderr, err, bt)
+        end
+    end
+end
+
+# Test functions
+myplus(x, y) = x + y
+function f(x)
+    x < 0.25 ? 1 :
+    x < 0.5  ? 1.0 :
+    x < 0.75 ? 0x01 : Float16(1)
+end
+g(c) = myplus(f(c[1]), f(c[2]))
+
+
+@testset "Cthulhu extension" begin
+    @testset "ascend for invalidations" begin
+        cproj = Base.active_project()
+        cd(joinpath(dirname(@__DIR__), "testmodules", "Invalidation")) do
+            Pkg.activate(pwd())
+            Pkg.develop(path="./PkgC")
+            Pkg.develop(path="./PkgD")
+            Pkg.precompile()
+            invalidations = @snoop_invalidations begin
+                @eval begin
+                    using PkgC
+                    PkgC.nbits(::UInt8) = 8
+                    using PkgD
+                end
+            end
+            tree = only(invalidation_trees(invalidations))
+            sig, root = only(tree.mt_backedges)
+
+            fake_terminal() do term, in, out, _
+                t = @async begin
+                    @with_try_stderr out ascend(term, root; interruptexc=false)
+                end
+                lines = String(readavailable(out))   # this gets the header
+                lines = String(readavailable(out))
+                @test occursin("call_nbits", lines)
+                @test occursin("map_nbits(::Vector{Integer})", lines)
+                # the job of the extension is done  once we've written the menu, so we can quit here
+                write(in, 'q')
+                wait(t)
+            end
+        end
+
+        Pkg.activate(cproj)
+    end
+
+    @testset "ascend for inference triggers" begin
+        tinf = @snoop_inference g([0.7, 0.8])
+        itrigs = inference_triggers(tinf; exclude_toplevel=false)
+        itrig = last(itrigs)
+
+        fake_terminal() do term, in, out, _
+            t = @async begin
+                @with_try_stderr out ascend(term, itrig; interruptexc=false)
+            end
+            lines = String(readavailable(out))   # this gets the header
+            lines = String(readavailable(out))
+            @test occursin("myplus(::UInt8, ::Float16)", lines)
+            @test occursin("g(::Vector{Float64})", lines)
+            # the job of the extension is done  once we've written the menu, so we can quit here
+            write(in, 'q')
+            wait(t)
+        end
+    end
+end
+
+end

test/runtests.jl

@@ -1,10 +1,14 @@
 using Test
 using SnoopCompile
 
-include("snoop_inference.jl")
-include("snoop_llvm.jl")
-include("snoop_invalidations.jl")
+if !isempty(ARGS)
+    "cthulhu" ∈ ARGS && include("extensions/cthulhu.jl")
+else
+    include("snoop_inference.jl")
+    include("snoop_llvm.jl")
+    include("snoop_invalidations.jl")
 
-# otherwise-untested demos
-retflat = SnoopCompile.flatten_demo()
-@test !isempty(retflat.children)
+    # otherwise-untested demos
+    retflat = SnoopCompile.flatten_demo()
+    @test !isempty(retflat.children)
+end