Allow markdown strings in code replacement

Project.toml

@@ -1,7 +1,7 @@
 name = "Grader"
 uuid = "d440d0cf-a03a-4c3f-a45e-240b6b8fa1ca"
 authors = ["Christopher Tessum <[email protected]> and contributors"]
-version = "0.3.0"
+version = "0.3.1"
 
 [deps]
 Espresso = "6912e4f1-e036-58b0-9138-08d1e6358ea9"
@@ -16,9 +16,10 @@ Parameters = "0.12"
 julia = "1"
 
 [extras]
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 
 [targets]
-test = ["Test", "Plots", "LinearAlgebra"]
+test = ["Test", "Plots", "LinearAlgebra", "Markdown"]

src/Grader.jl

@@ -186,7 +186,8 @@ function fill_answers(code::AbstractString, answerkey::Dict)::String
     expr = Espresso.subs(expr, answerkey)
     io = IOBuffer()
     print(io, expr)
-    String(take!(io))
+    s = String(take!(io))
+    replace(replace(s, r"end$"=>""), r"^begin"=>"") # remove begin and end added above
 end
 
 """

test/runtests.jl

@@ -250,6 +250,24 @@ using Test
         @test p.score ≈ 1.0
     end
 
+    @testset "fill answers 2" begin
+        code = """
+        using LinearAlgebra
+        using Markdown
+        n = missing
+        md\"\"\"Testing if markdown strings are okay.\"\"\"
+        """
+
+        answer_code = fill_answers(code, Dict(
+            :(n = missing) => :(n = LinearAlgebra.norm([1, 2, 3]))
+        ))
+
+        p = Problem()
+        answer = @runstudent! p answer_code
+        grade!(p, "norm", "calculate norm", 1, :($answer.n ≈ 3.7416573867739413), "norm is incorrect")
+        @test p.score ≈ 1.0
+    end
+
     @testset "plot" begin
         using LinearAlgebra
 
@@ -274,7 +292,6 @@ using Test
         grade!(p, "XY Plot", "Y values", 3,
             quote
                 ynorm = $norm($student.xy[1][1][:y])
-                println(ynorm)
                 ynorm ≈ 159.16343801262903
             end,
             "The Y values are not correct")