add tests

Author: oscardssmith

test/ryu.jl

@@ -122,18 +122,21 @@ end
     # 64-bit opt-size=0:  52 <= dist <= 52
     # 64-bit opt-size=1:  52 <= dist <= 59
     @test "2.900835519859558e-216" == Ryu.writeshortest(todouble(false, 307, 0))
+    @test "-2.900835519859558e-216" == Ryu.writeshortest(todouble(true, 307, 0))
     # 32-bit opt-size=0:  51 <= dist <= 51
     # 32-bit opt-size=1:  51 <= dist <= 59
     # 64-bit opt-size=0:  52 <= dist <= 52
     # 64-bit opt-size=1:  52 <= dist <= 59
     @test "5.801671039719115e-216" == Ryu.writeshortest(todouble(false, 306, maxMantissa))
+    @test "-5.801671039719115e-216" == Ryu.writeshortest(todouble(true, 306, maxMantissa))
 
     # https:#github.com/ulfjack/ryu/commit/19e44d16d80236f5de25800f56d82606d1be00b9#commitcomment-30146483
     # 32-bit opt-size=0:  49 <= dist <= 49
     # 32-bit opt-size=1:  44 <= dist <= 49
     # 64-bit opt-size=0:  50 <= dist <= 50
     # 64-bit opt-size=1:  44 <= dist <= 50
     @test "3.196104012172126e-27" == Ryu.writeshortest(todouble(false, 934, 0x000FA7161A4D6E0C))
+    @test "-3.196104012172126e-27" == Ryu.writeshortest(todouble(true, 934, 0x000FA7161A4D6E0C))
 end
 
 @testset "SmallIntegers" begin
@@ -304,6 +307,7 @@ end
     @test "1.00014165e-36" == Ryu.writeshortest(1.00014165f-36)
     @test "200.0" == Ryu.writeshortest(200f0)
     @test "3.3554432e7" == Ryu.writeshortest(3.3554432f7)
+    @test "-1.00000075f-36" == Ryu.writeshortest(-1.00000075f-36) #longest Float32
 end
 
 @testset "LooksLikePow5" begin
@@ -368,6 +372,9 @@ end
 #     return fails / (fails + success)
 # end
 
+@testset "Regression"
+    @test "-0.00010014" == Ryu.writeshortest(Float16(-0.00010014)) #longest Float16
+end
 end # Float16
 
 @testset "writeshortest(::AbstractVector, pos, ...)" begin