1 files changed, 20 insertions, 0 deletions
diff --git a/util_test.go b/util_test.go
new file mode 100644
index 0000000..65cc3bc
--- /dev/null
+++ b/util_test.go
@@ -0,0 +1,20 @@
+package core_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+
+	"go.awhk.org/core"
+)
+
+func TestMust(s *testing.T) {
+	t := core.T{T: s, Options: []cmp.Option{cmpopts.EquateErrors()}}
+
+	err := errors.New("some error")
+	t.AssertPanicsWith(func() { core.Must(42, err) }, err)
+	t.AssertNotPanics(func() { core.Must(42, nil) })
+	t.AssertEqual(42, core.Must(42, nil))
+}