Feat/error logs (#16)

* added list of tasks to achieve

* update deps

* update elixir version in CI/CD pipeline

* update todo with branch push checks

* underscores separation of large numbers

* update elixir version and deps

* add basic module  docs

* remove IO.inspect call

* check if list is empty rather than traversing list for length

* revert empty list code

* duration tests

* add mime type tests

* use logger instread of inspect, remove todos

* replace list length check with Enum.empty

* replace list length check with !Enum.empty?

* numbers readability fix by using underscores on large numbers

* iucn parser replaced case with multiclause function and added test

* replace map and join with map_join

* fix multiple spec issues where map() must be inside a list

test/file_server/mime_types_test.exs

@@ -0,0 +1,43 @@
+defmodule PlantIdDiscordBotTest.FileServer.MimeTypes do
+  use ExUnit.Case, async: true
+
+  alias PlantIdDiscordBot.FileServer.MimeTypes
+  doctest MimeTypes
+
+  describe "detect_mime_type/1" do
+    test "detects webp" do
+      bin = <<0x52, 0x49, 0x46, 0x46, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/webp"}
+    end
+
+    test "detects jpeg" do
+      bin = <<0xFF, 0xD8, 0xFF, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/jpeg"}
+    end
+
+    test "detects png" do
+      bin = <<0x89, 0x50, 0x4E, 0x47, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/png"}
+    end
+
+    test "detects gif" do
+      bin = <<0x47, 0x49, 0x46, 0x38, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/gif"}
+    end
+
+    test "detects bmp" do
+      bin = <<0x42, 0x4D, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/bmp"}
+    end
+
+    test "detects tiff" do
+      bin = <<0x49, 0x49, 0x2A, 0x00, 0x00>>
+      assert MimeTypes.detect_mime_type(bin) == {:ok, "image/tiff"}
+    end
+
+    test "returns error for unsupported type" do
+      bin = <<0x00, 0x11, 0x22, 0x33>>
+      assert MimeTypes.detect_mime_type(bin) == {:error, "Unsupported file type"}
+    end
+  end
+end