get-packs for local generated pack

test/instance_static/local_pack/files.json

@@ -0,0 +1,3 @@
+{
+  "blank": "blank.png"
+}

test/instance_static/local_pack/manifest.json

@@ -0,0 +1,10 @@
+{
+  "local": {
+    "src_sha256": "384025A1AC6314473863A11AC7AB38A12C01B851A3F82359B89B4D4211D3291D",
+    "src": "test/fixtures/emoji/packs/blank.png.zip",
+    "license": "Apache 2.0",
+    "homepage": "https://example.com",
+    "files": "files.json",
+    "description": "Some local pack"
+  }
+}

test/tasks/emoji_test.exs

@@ -73,6 +73,19 @@ defmodule Mix.Tasks.Pleroma.EmojiTest do
       on_exit(fn -> File.rm_rf!("test/instance_static/emoji/finmoji") end)
     end
 
+    test "install local emoji pack" do
+      assert capture_io(fn ->
+               Emoji.run([
+                 "get-packs",
+                 "local",
+                 "--manifest",
+                 "test/instance_static/local_pack/manifest.json"
+               ])
+             end) =~ "Writing pack.json for"
+
+      on_exit(fn -> File.rm_rf!("test/instance_static/emoji/local") end)
+    end
+
     test "pack not found" do
       mock(fn
         %{