tests: add tests for `-d debug`, `-cg`, `-g` in combination for `[if debug]fn` etc

vlib/v/checker/tests/custom_comptime_define_if_debug.cg.run.out

@@ -0,0 +1,3 @@
+main with debug
+foo, x: 123
+done

vlib/v/checker/tests/custom_comptime_define_if_debug.debug.bar.run.out

@@ -0,0 +1,3 @@
+foo, x: 123
+bar, x: 456
+done

vlib/v/checker/tests/custom_comptime_define_if_debug.debug.run.out

@@ -0,0 +1,2 @@
+foo, x: 123
+done

vlib/v/checker/tests/custom_comptime_define_if_debug.g.run.out

@@ -0,0 +1,3 @@
+main with debug
+foo, x: 123
+done

vlib/v/checker/tests/custom_comptime_define_if_debug.run.out

@@ -0,0 +1 @@
+done

vlib/v/checker/tests/custom_comptime_define_if_debug.vv

@@ -0,0 +1,18 @@
+[if debug]
+fn foo(x int) {
+	println('foo, x: $x')
+}
+
+[if bar]
+fn bar(x int) {
+	println('bar, x: $x')
+}
+
+fn main() {
+	$if debug {
+		println('main with debug')
+	}
+	foo(123) // will not be called if `-d debug` is not passed
+	bar(456) // will not be called if `-d bar` is not passed
+	println('done')
+}

vlib/v/compiler_errors_test.v

@@ -8,7 +8,7 @@ import runtime
 import benchmark
 
 const skip_files = [
-		'vlib/v/checker/tests/custom_comptime_define_if_flag.vv',
+		'non_existing.vv' /* minimize commit diff churn, do not remove */,
 	]
 
 const skip_on_ubuntu_musl = [
@@ -74,12 +74,6 @@ fn test_all() {
 	tasks.add('', parser_dir, '-prod', '.out', parser_tests, false)
 	tasks.add('', checker_dir, '-prod', '.out', checker_tests, false)
 	tasks.add('', scanner_dir, '-prod', '.out', scanner_tests, false)
-	tasks.add('', checker_dir, '-d mysymbol run', '.mysymbol.run.out', ['custom_comptime_define_error.vv'],
-		false)
-	tasks.add('', checker_dir, '-d mydebug run', '.mydebug.run.out', ['custom_comptime_define_if_flag.vv'],
-		false)
-	tasks.add('', checker_dir, '-d nodebug run', '.nodebug.run.out', ['custom_comptime_define_if_flag.vv'],
-		false)
 	tasks.add('', checker_dir, '--enable-globals run', '.run.out', ['globals_error.vv'],
 		false)
 	tasks.add('', global_dir, '--enable-globals', '.out', global_tests, false)
@@ -118,6 +112,25 @@ fn test_all() {
 			'.var_invalid.run.out', ['using_comptime_env.vv'], false)
 		cte_tasks.run()
 	}
+	mut ct_tasks := Tasks{
+		vexe: vexe
+		parallel_jobs: 1
+		label: 'comptime define tests'
+	}
+	ct_tasks.add_checked_run('-d mysymbol run', '.mysymbol.run.out', ['custom_comptime_define_error.vv'])
+	ct_tasks.add_checked_run('-d mydebug run', '.mydebug.run.out', ['custom_comptime_define_if_flag.vv'])
+	ct_tasks.add_checked_run('-d nodebug run', '.nodebug.run.out', ['custom_comptime_define_if_flag.vv'])
+	ct_tasks.add_checked_run('run', '.run.out', ['custom_comptime_define_if_debug.vv'])
+	ct_tasks.add_checked_run('-g run', '.g.run.out', ['custom_comptime_define_if_debug.vv'])
+	ct_tasks.add_checked_run('-cg run', '.cg.run.out', ['custom_comptime_define_if_debug.vv'])
+	ct_tasks.add_checked_run('-d debug run', '.debug.run.out', ['custom_comptime_define_if_debug.vv'])
+	ct_tasks.add_checked_run('-d debug -d bar run', '.debug.bar.run.out', ['custom_comptime_define_if_debug.vv'])
+	ct_tasks.run()
+}
+
+fn (mut tasks Tasks) add_checked_run(voptions string, result_extension string, tests []string) {
+	checker_dir := 'vlib/v/checker/tests'
+	tasks.add('', checker_dir, voptions, result_extension, tests, false)
 }
 
 fn (mut tasks Tasks) add(custom_vexe string, dir string, voptions string, result_extension string, tests []string, is_module bool) {