Test Block Pattern Reference

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © test-block-pattern

//@version=6
// This file is a RUNNABLE REFERENCE for the assertion-counter test pattern used
// throughout this skill's scaffolded templates. It is not meant to be scaffolded
// as a real project — copy the pieces you need into your own script's testMode
// section. Tallying pass/fail counts in a small table (instead of one label per
// assertion per bar) avoids spending your label/plot-count budget on a long
// backtest, and gives an at-a-glance summary instead of a wall of markers.
indicator("Test Block Pattern Reference", overlay=false)

// ————— Inputs
bool testModeInput = input.bool(true, "Test Mode", group="Debug/Test")

// ————— Calculations
// Keep this in sync with the number of assertFailed() calls below.
int TEST_COUNT = 2
var int passCount = 0
var int failCount = 0

// @function Draws a failure marker and RETURNS 1 on failure, 0 on pass.
//
// The shape matters: Pine forbids a function from modifying a variable declared
// at global scope (compile error CE10088), so an assertion helper CANNOT
// increment the counters itself — it has to return a number the caller adds up.
// A helper that also needs both if/else branches to yield the same type
// (CE10235) is a second reason to end the function on one plain expression.
assertFailed(bool condition, string description) =>
    if not condition
        label.new(
             bar_index, high, "FAIL: " + description, color=#f23645,
             textcolor=color.white, style=label.style_label_down, size=size.tiny
             )
    condition ? 0 : 1

// Example assertions — replace with real checks about your own script's values.
// Keep them cheap (no repainting side effects) since they run every bar.
if testModeInput
    int fails = 0
    fails += assertFailed(not na(close), "close should never be na")
    fails += assertFailed(bar_index >= 0, "bar_index should never be negative")
    failCount += fails
    passCount += TEST_COUNT - fails

// ————— Visuals
// Every cell sets text_color explicitly: Pine defaults cell text to BLACK, so a
// cell without it is invisible on a dark chart — and a table with no bgcolor is
// fully transparent, which makes that worse.
color PASS_COLOR  = #089981
color FAIL_COLOR  = #f23645
color MUTED_COLOR = #b2b5be
color PANEL_COLOR = #131722

var table testDashboard = table.new(
     position.bottom_left, 2, 2, border_width=1,
     bgcolor=color.new(PANEL_COLOR, 15),
     frame_color=color.new(MUTED_COLOR, 70), frame_width=1)
if testModeInput and barstate.islast
    testDashboard.cell(0, 0, "Passed", text_size=size.small, text_color=MUTED_COLOR,
         text_halign=text.align_left)
    testDashboard.cell(1, 0, str.tostring(passCount), text_color=PASS_COLOR,
         text_size=size.small, text_halign=text.align_right)
    testDashboard.cell(0, 1, "Failed", text_size=size.small, text_color=MUTED_COLOR,
         text_halign=text.align_left)
    testDashboard.cell(1, 1, str.tostring(failCount), text_size=size.small,
         text_color=failCount > 0 ? FAIL_COLOR : PASS_COLOR, text_halign=text.align_right)