x509fork tests (#163)

* copy verify_test.go and cert_pool_test.go

* fix tests

* typo

Author: phbnf

internal/x509fork/cert_pool_test.go

@@ -0,0 +1,73 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package x509fork
+
+import (
+	"crypto/x509"
+	"testing"
+)
+
+func TestCertPoolEqual(t *testing.T) {
+	tc := &x509.Certificate{Raw: []byte{1, 2, 3}, RawSubject: []byte{2}}
+	otherTC := &x509.Certificate{Raw: []byte{9, 8, 7}, RawSubject: []byte{8}}
+
+	emptyPool := NewCertPool()
+	nonSystemPopulated := NewCertPool()
+	nonSystemPopulated.AddCert(tc)
+	nonSystemPopulatedAlt := NewCertPool()
+	nonSystemPopulatedAlt.AddCert(otherTC)
+	tests := []struct {
+		name  string
+		a     *CertPool
+		b     *CertPool
+		equal bool
+	}{
+		{
+			name:  "two empty pools",
+			a:     emptyPool,
+			b:     emptyPool,
+			equal: true,
+		},
+		{
+			name:  "one empty pool, one populated pool",
+			a:     emptyPool,
+			b:     nonSystemPopulated,
+			equal: false,
+		},
+		{
+			name:  "two populated pools",
+			a:     nonSystemPopulated,
+			b:     nonSystemPopulated,
+			equal: true,
+		},
+		{
+			name:  "two populated pools, different content",
+			a:     nonSystemPopulated,
+			b:     nonSystemPopulatedAlt,
+			equal: false,
+		},
+		{
+			name:  "two nil pools",
+			a:     nil,
+			b:     nil,
+			equal: true,
+		},
+		{
+			name:  "one nil pool, one empty pool",
+			a:     nil,
+			b:     emptyPool,
+			equal: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			equal := tc.a.Equal(tc.b)
+			if equal != tc.equal {
+				t.Errorf("Unexpected Equal result: got %t, want %t", equal, tc.equal)
+			}
+		})
+	}
+}