Testing colours printing on various console. Colours source: https://github.com/TwP/logging/blob/master/lib/logging/color_scheme.rb#L211

testing_colors.rb

# Testing colours printing on VisualStudio console and PowerShell to check how
# colours are represented. This is for choosing color scheme of logging library
# Constants source: https://github.com/TwP/logging/blob/master/lib/logging/color_scheme.rb
module Color

  # Miscellaneous stuff
  module Misc
    # Embed in a String to clear all previous ANSI sequences.  This *MUST* be
    # done before the program exits!
    CLEAR      = "\e[0m".freeze
    RESET      = CLEAR              # An alias for CLEAR.
    ERASE_LINE = "\e[K".freeze      # Erase the current line of terminal output.
    ERASE_CHAR = "\e[P".freeze      # Erase the character under the cursor.
    BOLD       = "\e[1m".freeze     # The start of an ANSI bold sequence.
    DARK       = "\e[2m".freeze     # The start of an ANSI dark sequence.  (Terminal support uncommon.)
    UNDERLINE  = "\e[4m".freeze     # The start of an ANSI underline sequence.
    UNDERSCORE = UNDERLINE          # An alias for UNDERLINE.
    BLINK      = "\e[5m".freeze     # The start of an ANSI blink sequence.  (Terminal support uncommon.)
    REVERSE    = "\e[7m".freeze     # The start of an ANSI reverse sequence.
    CONCEALED = "\e[8m".freeze # The start of an ANSI concealed sequence.  (Terminal support uncommon.)
  end

  # Font colors
  module Font
    BLACK      = "\e[30m".freeze    # Set the terminal's foreground ANSI color to black.
    RED        = "\e[31m".freeze    # Set the terminal's foreground ANSI color to red.
    GREEN      = "\e[32m".freeze    # Set the terminal's foreground ANSI color to green.
    YELLOW     = "\e[33m".freeze    # Set the terminal's foreground ANSI color to yellow.
    BLUE       = "\e[34m".freeze    # Set the terminal's foreground ANSI color to blue.
    MAGENTA    = "\e[35m".freeze    # Set the terminal's foreground ANSI color to magenta.
    CYAN       = "\e[36m".freeze    # Set the terminal's foreground ANSI color to cyan.
    WHITE      = "\e[37m".freeze    # Set the terminal's foreground ANSI color to white.
    BRIGHT_RED        = "\e[1;31m".freeze    # Set the terminal's foreground ANSI color to bright red.
    BRIGHT_GREEN      = "\e[1;32m".freeze    # Set the terminal's foreground ANSI color to bright green.
    BRIGHT_YELLOW     = "\e[1;33m".freeze    # Set the terminal's foreground ANSI color to bright yellow.
    BRIGHT_BLUE       = "\e[1;34m".freeze    # Set the terminal's foreground ANSI color to bright blue.
    BRIGHT_MAGENTA    = "\e[1;35m".freeze    # Set the terminal's foreground ANSI color to bright magenta.
    BRIGHT_CYAN       = "\e[1;36m".freeze    # Set the terminal's foreground ANSI color to bright cyan.
    BRIGHT_WHITE      = "\e[1;37m".freeze    # Set the terminal's foreground ANSI color to bright white.
  end

  # Background color
  module Back
    ON_BLACK   = "\e[40m".freeze    # Set the terminal's background ANSI color to black.
    ON_RED     = "\e[41m".freeze    # Set the terminal's background ANSI color to red.
    ON_GREEN   = "\e[42m".freeze    # Set the terminal's background ANSI color to green.
    ON_YELLOW  = "\e[43m".freeze    # Set the terminal's background ANSI color to yellow.
    ON_BLUE    = "\e[44m".freeze    # Set the terminal's background ANSI color to blue.
    ON_MAGENTA = "\e[45m".freeze    # Set the terminal's background ANSI color to magenta.
    ON_CYAN    = "\e[46m".freeze    # Set the terminal's background ANSI color to cyan.
    ON_WHITE   = "\e[47m".freeze    # Set the terminal's background ANSI color to white.
    ON_BRIGHT_RED     = "\e[1;41m".freeze    # Set the terminal's background ANSI color to bright red.
    ON_BRIGHT_GREEN   = "\e[1;42m".freeze    # Set the terminal's background ANSI color to bright green.
    ON_BRIGHT_YELLOW  = "\e[1;43m".freeze    # Set the terminal's background ANSI color to bright yellow.
    ON_BRIGHT_BLUE    = "\e[1;44m".freeze    # Set the terminal's background ANSI color to bright blue.
    ON_BRIGHT_MAGENTA = "\e[1;45m".freeze    # Set the terminal's background ANSI color to bright magenta.
    ON_BRIGHT_CYAN    = "\e[1;46m".freeze    # Set the terminal's background ANSI color to bright cyan.
    ON_BRIGHT_WHITE = "\e[1;47m".freeze # Set the terminal's background ANSI color to bright white.
  end

end 

def color_text(text, color)
  color_tag = Color::Font.const_get(color.to_s.upcase)
  color_tag + text + Color::Misc::CLEAR
end

def color_back(text, color)
  color_tag = Color::Back.const_get(color.to_s.upcase)
  color_tag + text + Color::Misc::CLEAR
end

# Loop through font colours
Color::Font.constants.each do |c|
  text = "This is a long long long text in #{c}"
  puts color_text(text, c)
end

puts ""

# Loop through background colours
Color::Back.constants.each do |b|
  text_white = "#{Color::Font::WHITE}This is a long long long text in white over #{b}#{Color::Misc::CLEAR}"
  puts color_back(text_white, b)
end
puts ""
Color::Back.constants.each do |b|
  text_black = "#{Color::Font::BLACK}TThis is a long long long text in black over #{b}#{Color::Misc::CLEAR}"
  puts color_back(text_black, b)
end