Add tests for activate and deactivate

test/deactivate.bats

@@ -0,0 +1,27 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+setup() {
+  export PYENV_ROOT="${TMP}/pyenv"
+}
+
+@test "deactivate virtualenv" {
+  PYENV_SHELL="bash" run pyenv-sh-deactivate
+
+  assert_success
+  assert_output <<EOS
+declare -f deactivate 1>/dev/null 2>&1 && deactivate
+pyenv shell --unset
+EOS
+}
+
+@test "deactivate virtualenv (fish)" {
+  PYENV_SHELL="fish" run pyenv-sh-deactivate
+
+  assert_success
+  assert_output <<EOS
+functions -q deactivate; and deactivate
+pyenv shell --unset
+EOS
+}