Test batch (un)install (#131)

* Test batch (un)install

* Use small Python packages for testing

Author: tkf

test/runtests.jl

@@ -48,3 +48,15 @@ Conda.add_channel("foo", env)
 
 Conda.rm_channel("foo", env)
 @test Conda.channels(env) == ["defaults"]
+
+@testset "Batch install and uninstall" begin
+    Conda.add(["affine", "ansi2html"], env)
+    installed = Conda._installed_packages(env)
+    @test "affine" ∈ installed
+    @test "ansi2html" ∈ installed
+
+    Conda.rm(["affine", "ansi2html"], env)
+    installed = Conda._installed_packages(env)
+    @test "affine" ∉ installed
+    @test "ansi2html" ∉ installed
+end