Update specialfunctionstests.jl

Author: putianyi889

test/specialfunctionstests.jl

@@ -5,4 +5,9 @@ using Compat.Test
     @test pochhammer(2,3) == 24
     @test pochhammer(0.5,3) == 0.5*1.5*2.5
     @test pochhammer(0.5,0.5) == 1/sqrtpi
+    @test pochhammer(0,1) == 0
+    @test pochhammer(-1,2) == 0
+    @test pochhammer(-5,3) == -60
+    @test pochhammer(-1,-0.5) == 0
+    @test pochhammer(-0.5,-0.5) == Inf
 end