refactor: get rid of package expressions by moving the code into package expression

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/checker/expression/url_values_test.go

@@ -0,0 +1,50 @@
+package expression
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/google/cel-go/common/types"
+)
+
+func TestURLValues(t *testing.T) {
+	headers := URLValues{
+		Values: url.Values{
+			"format": {"json"},
+		},
+	}
+
+	t.Run("contains-existing-key", func(t *testing.T) {
+		resp := headers.Contains(types.String("format"))
+		if !resp.(types.Bool) {
+			t.Fatal("headers does not contain User-Agent")
+		}
+	})
+
+	t.Run("not-contains-missing-key", func(t *testing.T) {
+		resp := headers.Contains(types.String("not-there"))
+		if resp.(types.Bool) {
+			t.Fatal("headers does not contain User-Agent")
+		}
+	})
+
+	t.Run("get-existing-key", func(t *testing.T) {
+		val := headers.Get(types.String("format"))
+		switch val.(type) {
+		case types.String:
+			// ok
+		default:
+			t.Fatalf("result was wrong type %T", val)
+		}
+	})
+
+	t.Run("not-get-missing-key", func(t *testing.T) {
+		val := headers.Get(types.String("not-there"))
+		switch val.(type) {
+		case *types.Err:
+			// ok
+		default:
+			t.Fatalf("result was wrong type %T", val)
+		}
+	})
+}