Minor test tweaks to the justfile.

Author: ceejbot

.justfile

@@ -5,8 +5,22 @@ _help:
 
 # Run all tests using nextest.
 test:
+	#!/usr/bin/env bash
+	if ! psql -lqtA | grep -q "^backfill_test|" ; then
+		createdb backfill_test
+	fi
+	export DATABASE_URL="postgresql://localhost:5432/backfill_test"
 	cargo nextest run -F axum
 
+# Run the named tests using nextest.
+test-one ARG:
+	#!/usr/bin/env bash
+	if ! psql -lqtA | grep -q "^backfill_test|" ; then
+		createdb backfill_test
+	fi
+	export DATABASE_URL="postgresql://localhost:5432/backfill_test"
+	cargo nextest run -F axum {{ARG}}
+
 # get a testing coverage report
 coverage:
 	cargo llvm-cov --all-targets --workspace --summary-only