chore: establish local platform baseline

internal/identity/principal_test.go

@@ -0,0 +1,17 @@
+package identity
+
+import (
+	"context"
+	"testing"
+)
+
+func TestPrincipalContext(t *testing.T) {
+	if _, ok := PrincipalFromContext(context.Background()); ok {
+		t.Fatal("empty context should not contain a principal")
+	}
+	expected := Principal{Issuer: "issuer", Subject: "subject"}
+	actual, ok := PrincipalFromContext(WithPrincipal(context.Background(), expected))
+	if !ok || actual != expected {
+		t.Fatalf("principal = %#v, %t, want %#v", actual, ok, expected)
+	}
+}