Add extra tests for the code on this branch.

FossilOrigin-Name: b15bbb201a7727806b9fd6c02f2579b01e0e38155a8f9e24c5d6f487fe3e8b6c

test/literal2.test

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+# 2024 Jan 23
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+
+####################################################
+# DO NOT EDIT! THIS FILE IS AUTOMATICALLY GENERATED!
+####################################################
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix literal2
+
+do_execsql_test 1.0 {
+  SELECT 123_456
+} {123456}
+
+# PG says ERROR:  trailing junk after numeric literal at or near "123_"
+do_test 1.1 { catch { execsql {
+  SELECT 123__456
+} } } 1
+
+
+do_test 2.1 {
+  set myres {}
+  foreach r [db eval {SELECT 1.0e1_2}] {
+    lappend myres [format %.4f [set r]]
+  }
+  set res2 {1000000000000.0000}
+  set i 0
+  foreach r [set myres] r2 [set res2] {
+    if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} {
+      error "list element [set i] does not match: got=[set r] expected=[set r2]"
+    }
+    incr i
+  }
+  set {} {}
+} {}
+
+finish_test