Test Evidence: Vietnam business-date clock boundary

Test type: Unit
Requirement IDs: ACC-019, ACC-020
Scenario IDs: AC-ACC-010 (business-date boundary only)
Test class/method: com.lab.labtimesheet.config.TimeConfigurationTest#utcInstantAtVietnamMidnightUsesTheNewLocalBusinessDate
Implementation commit: 06dba4fb13eed675cc08ff8c00fe3e3650468c3b

Protected behavior

The production application clock uses Asia/Ho_Chi_Minh, so account lifecycle decisions based on LocalDate.now advance at Vietnam midnight rather than seven hours later at UTC midnight.

Test method

The test obtains the real production clock configuration, fixes its configured zone at the UTC instant 2026-08-14T17:00:00Z, and derives the local business date. No Spring context or database is needed because the contract under test is the clock bean's zone.

Hand-derived expected result

Vietnam is UTC+07:00, so 2026-08-14T17:00:00Z is 2026-08-15T00:00:00+07:00 and the business date is 2026-08-15.

RED

Command

export JAVA_HOME=/opt/homebrew/opt/openjdk@25
export PATH="$JAVA_HOME/bin:$PATH"
./mvnw -Dtest=TimeConfigurationTest test

Observed result

Tests run: 1, Failures: 1, Errors: 0, Skipped: 0
Expected 2026-08-15 but was 2026-08-14 because the production clock used UTC.
BUILD FAILURE

GREEN

Command

./mvnw -Dtest=TimeConfigurationTest test

Observed result

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS

Affected suite

Command and result

./mvnw -Dtest=TimeConfigurationTest,BootstrapIntegrationTest,SmtpOnboardingWebIntegrationTest,AccountActivationIntegrationTest,AccountWebIntegrationTest,BootstrapOnboardingWebIntegrationTest,JavaMailSmtpProbeTest,SecurityResponseIntegrationTest test
Tests run: 22, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS
PostgreSQL: 18.4

External-test boundaries

This verifies the production clock zone and its midnight boundary. It does not exercise later scheduler behavior or attendance-policy timezone versioning.

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