sh-rehash: Fix erroneously executing rather than printing a command (#3369)

libexec/pyenv-sh-rehash

@@ -11,7 +11,7 @@ shell="$(basename "${PYENV_SHELL:-$SHELL}")"
 
 # When pyenv shell integration is enabled, delegate to pyenv-rehash,
 # then tell the shell to empty its command lookup cache.
-pyenv-rehash
+echo "pyenv-rehash"
 
 case "$shell" in
 fish )

test/rehash.bats

@@ -110,13 +110,27 @@ SH
 @test "sh-rehash in bash" {
   create_executable "3.4" "python"
   PYENV_SHELL=bash run pyenv-sh-rehash
-  assert_success "hash -r 2>/dev/null || true"
+  assert_success "pyenv-rehash
+hash -r 2>/dev/null || true"
+}
+
+@test "sh-rehash in bash (integration)" {
+  create_executable "3.4" "python"
+  run eval "$(pyenv-sh-rehash)"
+  assert_success
   assert [ -x "${PYENV_ROOT}/shims/python" ]
 }
 
 @test "sh-rehash in fish" {
   create_executable "3.4" "python"
   PYENV_SHELL=fish run pyenv-sh-rehash
-  assert_success ""
+  assert_success "pyenv-rehash"
+}
+
+@test "sh-rehash in fish (integration)" {
+  command -v fish >/dev/null || skip "-- fish not installed" 
+  create_executable "3.4" "python"
+  run fish -Nc "eval (pyenv-sh-rehash)"
+  assert_success
   assert [ -x "${PYENV_ROOT}/shims/python" ]
 }