fix impossible "$x" descriptions containing only interpolations

Author: rfourquet

src/ReTest.jl

@@ -159,8 +159,13 @@ function resolve!(mod::Module, ts::TestsetExpr, rx::Regex;
         ts.run = true
         if shown
             # set ts.descwidth to a lower bound to reduce misalignment
-            ts.descwidth = 2*depth + mapreduce(textwidth, +,
-                                               filter(x -> x isa String, desc.args))
+            ts.descwidth = 2*depth + mapreduce(+, desc.args) do part
+                                         if part isa String
+                                             textwidth(part)
+                                         else
+                                             4 # give 4 spaces for unknown string part
+                                         end
+                                     end
         end
     end
 

test/runtests.jl

@@ -481,20 +481,24 @@ end
         @test true
         push!(RUN, 5)
     end
+    @testset "$i" begin # must work even "$i" is made only of Expr (no String parts)
+        @test true
+        push!(RUN, 6)
+    end
 end
 end # InterpolateImpossible
 
 retest(InterpolateImpossible, dry=true)
 retest(InterpolateImpossible)
-@test InterpolateImpossible.RUN == 1:5
+@test InterpolateImpossible.RUN == 1:6
 empty!(InterpolateImpossible.RUN)
 
 retest(InterpolateImpossible, "0")
-@test InterpolateImpossible.RUN == 1:5
+@test InterpolateImpossible.RUN == 1:6
 empty!(InterpolateImpossible.RUN)
 
 retest(InterpolateImpossible, "4") # should have a warning or two
-@test InterpolateImpossible.RUN == 4:5
+@test InterpolateImpossible.RUN == 4:6
 
 
 ### Failing ##################################################################