TestWebApplicationFactory instances shared the same in-memory database
because EF Core's UseInMemoryDatabase("InMemory") returns the same
backing store to every DbContext that asks for it under the same
connection string, in the same process. Whichever fixture started
first defined the state, and every subsequent fixture inherited it,
making tests silently order-dependent and flaky.
Fix:
- Yavsc.Tests.Shared/InMemoryDatabaseName: helper that suffixes the
in-memory connection string with a per-fixture GUID.
- TestWebApplicationFactory: instance GUID + ConnectionStrings__
YavscConnection set as an environment variable in the constructor
and cleared in Dispose, so each factory gets its own backing store.
Env var is needed because IdentityServer8.EntityFramework exposes
ConfigureDbContext as Action<DbContextOptionsBuilder> with no
service-provider access, so the connection string is captured at
registration time. AddEnvironmentVariables is the last provider in
the config pipeline and wins regardless.
- WebServerFixture: process-static GUID (WebHostFixture is a
per-process singleton by design, so the test collection shares one
store; the GUID still isolates from TestWebApplicationFactory).
- AddIdentityDBAndStores: read the connection string at DbContext
construction time via the (sp, options) overload of AddDbContext,
so test fixtures can override it via the host's IConfiguration.
IdentityServer stores cannot do the same without subclassing the
framework's DbContexts; the env var path is the documented escape
hatch in HostingExtensions.AddIdentityServer.
- UsesInMemoryProvider: StartsWith instead of equality, so
'InMemory-{guid}' is still recognised as an in-memory connection
string.
Regression sentinel in
Controllers/TestWebApplicationFactoryIsolationTests: two factories
seed a marker client in the first, the second must not see it.
Suite: 45/45 over 3 stable runs, 13-15s each.
Paul Schneider
61b41f0c55