Codex first iteration

internal/tools/tool_test.go

@@ -0,0 +1,32 @@
+package tools
+
+import (
+	"net/http"
+	"testing"
+)
+
+type fakeTool struct{ key, name string }
+
+func (f fakeTool) Definition() Definition     { return Definition{Key: f.key, Name: f.name} }
+func (fakeTool) StudentHandler() http.Handler { return http.NotFoundHandler() }
+func TestRegistry(t *testing.T) {
+	r := NewRegistry()
+	if err := r.Register(fakeTool{}); err == nil {
+		t.Fatal("empty key accepted")
+	}
+	if err := r.Register(fakeTool{key: "b", name: "Beta"}); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Register(fakeTool{key: "a", name: "Alpha"}); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Register(fakeTool{key: "a", name: "Again"}); err == nil {
+		t.Fatal("duplicate accepted")
+	}
+	if got := r.List(); len(got) != 2 || got[0].Definition().Key != "a" {
+		t.Fatalf("unstable list: %#v", got)
+	}
+	if _, err := r.Get("missing"); err != ErrNotFound {
+		t.Fatalf("got %v", err)
+	}
+}