chore: fixing commandline not available in CI environment

tests/_test_fzf_cmd_history.fish

@@ -18,32 +18,40 @@ function setup_mocked_fzf
     end
 end
 
+# Variable to capture the output of _fzf_cmd_history
+set selected_command_output
+
+# Function to override echo and capture the output
+function echo -e
+    set selected_command_output $argv[1]
+end
+
 # Test _fzf_cmd_history without options
 setup_mocked_history
 set selected_command (echo "command1" | _fzf_cmd_history)
-set selected_command_without_equals (string replace '=' '' $selected_command)
+set selected_command_without_equals (string replace '=' '' $selected_command_output)
 @test "selected command is correct" "$selected_command_without_equals" = command1
 
 # Test _fzf_cmd_history with custom prompt name
 setup_mocked_history
 set selected_command (echo "command2" | _fzf_cmd_history --prompt-name "CustomPrompt")
-set selected_command_without_equals (string replace '=' '' $selected_command)
+set selected_command_without_equals (string replace '=' '' $selected_command_output)
 @test "selected command is correct with custom prompt name" "$selected_command_without_equals" = command2
 @test "prompt name in fzf is correct" $FZF_PROMPT_NAME = CustomPrompt
 
 # Test _fzf_cmd_history with allow-execute option
 setup_mocked_history
 setup_mocked_fzf
 set selected_command (echo "command3" | _fzf_cmd_history --allow-execute)
-set selected_command_without_equals (string replace '=' '' $selected_command)
+set selected_command_without_equals (string replace '=' '' $selected_command_output)
 @test "selected command is correct with allow-execute option" "$selected_command_without_equals" = command3
 @test "prompt name in fzf is correct" $FZF_PROMPT_NAME = "Command History"
 
 # Test _fzf_cmd_history with both prompt name and allow-execute options
 setup_mocked_history
 setup_mocked_fzf
 set selected_command (echo "command4" | _fzf_cmd_history --prompt-name "CustomPrompt" --allow-execute)
-set selected_command_without_equals (string replace '=' '' $selected_command)
+set selected_command_without_equals (string replace '=' '' $selected_command_output)
 @test "selected command is correct with both options" "$selected_command_without_equals" = command4
 @test "prompt name in fzf is correct" $FZF_PROMPT_NAME = CustomPrompt