test/system: Test 'rmi' with an image without a name

https://github.com/containers/toolbox/pull/1195

test/system/102-list.bats

@@ -64,7 +64,7 @@ teardown() {
 }
 
 @test "list: List an image without a name" {
-  build_image_without_name
+  build_image_without_name >/dev/null
 
   run --keep-empty-lines --separate-stderr $TOOLBOX list
 
@@ -130,7 +130,7 @@ teardown() {
 
   pull_default_image
   pull_distro_image fedora 34
-  build_image_without_name
+  build_image_without_name >/dev/null
 
   run --keep-empty-lines --separate-stderr "$TOOLBOX" list --images
 

test/system/107-rmi.bats

@@ -70,7 +70,7 @@ teardown() {
   num_of_images="$(list_images)"
   assert_equal "$num_of_images" 0
 
-  build_image_without_name
+  build_image_without_name >/dev/null
 
   num_of_images="$(list_images)"
   assert_equal "$num_of_images" 1
@@ -90,6 +90,31 @@ teardown() {
   assert_equal "$num_of_images" 0
 }
 
+@test "rmi: An image without a name" {
+  local num_of_images
+  num_of_images="$(list_images)"
+  assert_equal "$num_of_images" 0
+
+  image="$(build_image_without_name)"
+
+  num_of_images="$(list_images)"
+  assert_equal "$num_of_images" 1
+
+  run --keep-empty-lines --separate-stderr "$TOOLBOX" rmi "$image"
+
+  assert_success
+  assert_output ""
+  output="$stderr"
+  assert_output ""
+  if check_bats_version 1.7.0; then
+    assert [ ${#lines[@]} -eq 0 ]
+    assert [ ${#stderr_lines[@]} -eq 0 ]
+  fi
+
+  num_of_images="$(list_images)"
+  assert_equal "$num_of_images" 0
+}
+
 @test "rmi: Try to remove all images with a container present and running" {
   skip "Bug: Fail in 'toolbox rmi' does not return non-zero value"
   num_of_images=$(list_images)

test/system/libs/helpers.bash

@@ -234,8 +234,12 @@ function build_image_without_name() {
   assert_line --index 1 --partial "LABEL com.github.containers.toolbox=\"true\""
   assert_line --index 2 --partial "COMMIT"
   assert_line --index 3 --regexp "^--> [a-z0-9]*$"
+  last=$((${#lines[@]}-1))
+  assert_line --index "$last" --regexp "^[a-f0-9]{64}$"
 
   rm -f "$BATS_TMPDIR"/Containerfile
+
+  echo "${lines[$last]}"
 }