# CD001-TOOLS-002: Payment Tools Unit Tests (CD001, #27)

[steadhac]

Parent: Unit tests creation for CD001 #27

Description

Add a full unit test suite for the payment tools layer — invoice retrieval for payment, payment processing, vendor payment summaries, and agent notes management.

Tests follow the established pattern with:

• Title
• Basically question
• Steps
• Expected Results
• Impact

Bug-exposing tests are included for each confirmed production defect.
Prompt injection tests document the LLM attack surface via string fields.

---

📁 Test Files

tests/unit/tools/test_payment.py

---

TestGetInvoiceForPayment

Test ID	Title
test_pay_get_001	get_invoice_for_payment returns invoice with vendor info
test_pay_get_002	get_invoice_for_payment raises ValueError when invoice not found
test_pay_get_003	get_invoice_for_payment enforces namespace isolation
test_pay_get_004	get_invoice_for_payment raises ValueError for invoice_id=0

---

TestProcessPayment

Test ID	Title
test_pay_proc_001	Approved invoice transitions to paid
test_pay_proc_002	Non-approved invoice raises ValueError
test_pay_proc_003	Missing invoice raises ValueError
test_pay_proc_004	Payment note appended to existing agent_notes
test_pay_proc_005	process_payment enforces namespace isolation
test_pay_proc_006	Already paid invoice cannot be paid again

---

TestGetVendorPaymentSummary

Test ID	Title
test_pay_sum_001	Returns summary with correct totals
test_pay_sum_002	Raises ValueError for missing vendor
test_pay_sum_003	Vendor with no invoices returns empty summary
test_pay_sum_004	get_vendor_payment_summary enforces namespace isolation
test_pay_sum_005	by_status amounts are correct across multiple invoices

---

TestUpdatePaymentAgentNotes

Test ID	Title
test_pay_notes_001	Notes appended with [Payments Agent] prefix
test_pay_notes_002	Raises ValueError for missing invoice
test_pay_notes_003	Sequential appends accumulate correctly
test_pay_notes_004	update_payment_agent_notes enforces namespace isolation

---

TestProcessPaymentBugs ⚠️ (failing — bugs confirmed)

Test ID	Title
test_pay_proc_007	process_payment silently accepts payment_method=None — writes literal "None"
test_pay_proc_008	process_payment accepts empty string payment_method without validation
test_pay_proc_009	process_payment silently accepts payment_reference=None — writes literal "None"

---

TestUpdatePaymentAgentNotesBugs ⚠️ (failing — bugs confirmed)

Test ID	Title
test_pay_notes_005	update_payment_agent_notes accepts agent_notes=None — writes "[Payments Agent] None"
test_pay_notes_006	Second ValueError says "Invoice not found" when invoice exists but update failed

---

TestIntFieldEdgeCases

Test ID	Title
test_pay_type_001	get_invoice_for_payment raises ValueError for invoice_id=-1
test_pay_type_002	get_invoice_for_payment raises ValueError for invoice_id=2147483647
test_pay_type_003	get_vendor_payment_summary raises ValueError for vendor_id=-1
test_pay_type_004	get_vendor_payment_summary raises ValueError for vendor_id=0
test_pay_type_005	process_payment raises ValueError for invoice_id=-1
test_pay_type_006	update_payment_agent_notes raises ValueError for invoice_id=-1

---

TestStrFieldEdgeCases

Test ID	Title
test_pay_type_007	Whitespace-only payment_method accepted without validation
test_pay_type_008	Special characters in payment_reference stored as-is
test_pay_type_009	SQL injection string in agent_notes stored safely
test_pay_type_010	Unicode and emoji in agent_notes accepted
test_pay_type_011	Newlines in agent_notes stored intact
test_pay_type_012	Very long agent_notes accepted without truncation
test_pay_type_013	Whitespace-only agent_notes accepted without validation
test_pay_type_014	Very long payment_reference accepted without truncation

---

TestMissingInvoiceFields ⚠️ (partially failing — bugs confirmed)

Test ID	Title
test_pay_field_001	get_invoice_for_payment crashes with AttributeError when invoice_date is None
test_pay_field_002	get_invoice_for_payment crashes with AttributeError when due_date is None
test_pay_field_003	process_payment raises ValueError when invoice status is None
test_pay_field_004	get_vendor_payment_summary returns None for missing invoice_number

---

TestPromptInjection 🔒 (security — attack surface documented)

Test ID	Title
test_pay_inj_001	Urgency in agent_notes does not change invoice status
test_pay_inj_002	"APPROVED" keyword in notes does not bypass code-level status check
test_pay_inj_003	Injected notes returned verbatim by get_invoice_for_payment — LLM can read them
test_pay_inj_004	Urgency in invoice description does not bypass status check
test_pay_inj_005	"APPROVED" in invoice_number does not bypass status check
test_pay_inj_006	Multiple injections accumulate — attacker can build fake approval history

---

Related Bug Tickets

• Bug_102
• Bug_103
• Bug_104
• Bug_105
• Bug_106
• Bug_107
• Bug_108

[steadhac]

PR including all the unit tests for tools payment #279