Add 4 more AL/BC testing patterns from Luc van Vugt's fluxxus.nl blog

Fourth batch from CURABIS ApS, mined from an external BC/NAV testing expert's blog archive (fluxxus.nl). Confirm+StrSubstNo interaction with ConfirmHandler, Table Relation Test's OnAfterRemoveTableRelation exclusion hook (verified against BCApps source, codeunit 134926), committing shared lazy-Initialize fixture data, and Assert.IsFalse vs asserterror for boolean checks.

microsoft/knowledge/testing/use-assert-isfalse-not-asserterror-for-boolean-checks.good.al

@@ -0,0 +1,18 @@
+codeunit 50143 "Sample Doc Amount Test"
+{
+    Subtype = Test;
+
+    [Test]
+    procedure DocAmountIsNotVerifiedWhenLinesAreMissing()
+    var
+        Assert: Codeunit Assert;
+        PurchHeader: Record "Purchase Header";
+    begin
+        Assert.IsFalse(VerifyDocAmount(PurchHeader), 'Doc. amount should not verify with no lines.');
+    end;
+
+    local procedure VerifyDocAmount(var PurchHeader: Record "Purchase Header"): Boolean
+    begin
+        exit(false);
+    end;
+}