Fix mismatched brackets error in `omf list` on Fish 2.2

Ref #707

pkg/omf/functions/packages/omf.packages.list.fish

@@ -14,8 +14,8 @@ function omf.packages.list -d 'List installed packages'
     set -e show_plugins
   end
 
-  set -l plugins_paths {$OMF_CONFIG, $OMF_PATH}/pkg/*
-  set -l themes_paths {$OMF_CONFIG, $OMF_PATH}/themes/*
+  set -l plugins_paths {$OMF_PATH,$OMF_CONFIG}/pkg/*
+  set -l themes_paths {$OMF_PATH,$OMF_CONFIG}/themes/*
 
   if set -q show_plugins
     for path in $plugins_paths

pkg/omf/spec/omf_list_spec.fish

@@ -0,0 +1,32 @@
+function describe_omf_list_tests
+  function before_all
+    set -gx CI WORKAROUND
+  end
+
+  function it_can_list_plugins
+    set -l list_output (omf list -p)
+    assert 0 = $status
+    assert "$list_output" = "fish-spec	omf"
+  end
+
+  function it_can_list_themes
+    set -l list_output (omf list -t)
+    assert 0 = $status
+    assert "$list_output" = "default"
+  end
+
+  function it_can_list_insttalled_plugins
+    set -l output (omf remove apt 2> /dev/null)
+    set -l output (omf install apt 2> /dev/null)
+    set -l list_output (omf list -p)
+    assert 0 = $status
+    assert "$list_output" = "apt		fish-spec	omf"
+    set -l output (omf remove apt 2> /dev/null)
+  end
+
+  function it_can_list_themes
+    set -l list_output (omf list -t)
+    assert 0 = $status
+    assert "$list_output" = "default"
+  end
+end