Change test targets of Fixed (JuliaMath#218)

Author: kimikage

test/common.jl

@@ -104,7 +104,7 @@ T == UInt32 |x - - - - - - -:- - - - - - - -:x - - - - - - -:- - - - - - - -|
 """
 function target_f(X::Type, T::Type{<:Integer}; ex = :default)
     f_min = X === Fixed ? 0 : 1
-    f_max = bitwidth(T) - (T <: Signed) - 1 + f_min
+    f_max = bitwidth(T) - (T <: Signed)
     ex === :heavy && return f_min:f_max
     ex === :default && bitwidth(T) <= 16 && return f_min:f_max
     ex === :thin && return ((f_max + 1) ÷ 2, f_max)

test/fixed.jl

@@ -24,8 +24,8 @@ function test_fixed(::Type{F}) where {F}
         fxf = convert(Float64, fx)
 
         @test convert(F, convert(Float64, fx)) === fx
-        @test convert(F, convert(Float64, -fx)) === -fx
-        @test convert(Float64, -fx) == -convert(Float64, fx)
+        fx != typemin(F) && @test convert(F, convert(Float64, -fx)) === -fx
+        fx != typemin(F) && @test convert(Float64, -fx) == -convert(Float64, fx)
 
         rx = convert(Rational{BigInt}, fx)
         @assert isequal(fx, rx) == isequal(hash(fx), hash(rx))
@@ -96,7 +96,11 @@ end
         f < bitwidth(T) - 1 && @test one(F) == 1
         f < bitwidth(T) - 1 && @test one(F) * oneunit(F) == oneunit(F)
         @test typemin(F) == typemin(T) >> f
-        @test typemax(F) == typemax(T)//big"2"^f
+        if T === Int128
+            @test typemax(F) * big"2"^f == typemax(T)
+        else
+            @test typemax(F) == typemax(T)//big"2"^f
+        end
         @test floatmin(F) === eps(F) == 2.0^-f # issue #79
         @test floatmax(F) === typemax(F)
         @test eps(zero(F)) === eps(typemax(F))