Feat/generic forward methods

assert/assert_adhoc_generic_methods_test.go

@@ -0,0 +1,42 @@
+// SPDX-FileCopyrightText: Copyright 2025 go-swagger maintainers
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build go1.27
+
+package assert_test
+
+import (
+	"testing"
+
+	"github.com/go-openapi/testify/v2/assert"
+)
+
+// TestGenericMethods exercises the generic assertions as methods against a real
+// [testing.T], the way a user writes them. The generated tests in this package drive
+// the same methods through a mock T; this one checks that they hold together outside
+// codegen, with the type parameter inferred, spelled out, or bound in a method value.
+func TestGenericMethods(t *testing.T) {
+	t.Parallel()
+
+	a := assert.New(t)
+
+	// inferred from the arguments
+	a.EqualT("expected", "expected")
+	a.NotEqualT(1, 2)
+	a.SliceContainsT([]string{"a", "b"}, "b")
+	a.MapContainsT(map[string]int{"a": 1}, "a")
+	a.GreaterT(2, 1)
+	a.InDeltaT(1.0, 1.000001, 1e-3)
+
+	// spelled out, for a type parameter no argument carries
+	a.IsOfTypeT[int](42)
+	a.IsNotOfTypeT[string](42)
+
+	// formatted variant
+	a.EqualTf(3, 3, "expected %d", 3)
+
+	// a method value, instantiated once and reused
+	equalInt := a.EqualT[int]
+	equalInt(1, 1)
+	equalInt(2, 2)
+}