Tests for mapreduce on empty collection (JuliaLang#22486)

* Tests for mapreduce on empty collection
IntelLabs · Jun 26, 2017 · e53da99 · e53da99
1 parent f3b310d
commit e53da99
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/test/reduce.jl b/test/reduce.jl
@@ -44,6 +44,13 @@
 @test mapreduce(abs2, +, [-9, -3]) == 81 + 9
 @test mapreduce(-, +, [-9, -3, -4, 8, -2]) == (9 + 3 + 4 - 8 + 2)
 @test mapreduce(-, +, collect(linspace(1.0, 10000.0, 10000))) == -50005000.0
+# empty mr
+@test mapreduce(abs2, +, Float64[]) === 0.0
+@test mapreduce(abs2, Base.scalarmax, Float64[]) === 0.0
+@test mapreduce(abs, max, Float64[]) === 0.0
+@test mapreduce(abs2, &, Float64[]) === true
+@test mapreduce(abs2, |, Float64[]) === false
+
 # mapreduce() type stability
 @test typeof(mapreduce(*, +, Int8[10])) ===
       typeof(mapreduce(*, +, Int8[10, 11])) ===