Add tests for ResolveMetadata protected header methods

Implemented tests for the ResolveMetadata struct to verify the behavior of GetProtectedHeaderString and GetProtectedHeaderChain methods. This ensures correct functionality for different input scenarios, including cases where headers do not exist or values are of incorrect types.

vdr/resolver/did_test.go

@@ -23,7 +23,8 @@ import (
 	"crypto/elliptic"
 	"crypto/rand"
 	"errors"
-	"github.com/nuts-foundation/go-did"
+	"github.com/lestrrat-go/jwx/v2/cert"
+	ssi "github.com/nuts-foundation/go-did"
 	"github.com/nuts-foundation/go-did/did"
 	"github.com/nuts-foundation/nuts-node/crypto/hash"
 	"github.com/stretchr/testify/assert"
@@ -241,3 +242,100 @@ func TestChainedDIDResolver_Resolve(t *testing.T) {
 		assert.ErrorIs(t, err, ErrNotFound)
 	})
 }
+
+func TestResolveMetadata_GetProtectedHeaderString(t *testing.T) {
+	tt := []struct {
+		name       string
+		inputKey   string
+		testKey    string
+		inputValue any
+		expectedOk bool
+	}{
+		{"no JwtProtectedHeaders",
+			"",
+			"testKey",
+			"",
+			false,
+		},
+		{"key not exist",
+			"testKey",
+			"otherKey",
+			"testValue",
+			false,
+		},
+		{"key exists",
+			"testKey",
+			"testKey",
+			"testValue",
+			true,
+		},
+		{"no sting value",
+			"testKey",
+			"testKey",
+			time.Now(),
+			false,
+		},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			meta := &ResolveMetadata{}
+			if tc.inputKey != "" {
+				meta.JwtProtectedHeaders = make(map[string]interface{})
+				meta.JwtProtectedHeaders[tc.inputKey] = tc.inputValue
+			}
+			foundValue, foundOk := meta.GetProtectedHeaderString(tc.testKey)
+			assert.Equal(t, tc.expectedOk, foundOk)
+			if tc.expectedOk {
+				assert.Equal(t, tc.inputValue, foundValue)
+			}
+		})
+	}
+}
+func TestResolveMetadata_GetProtectedHeaderChain(t *testing.T) {
+	tt := []struct {
+		name       string
+		inputKey   string
+		testKey    string
+		inputValue any
+		expectedOk bool
+	}{
+		{"no JwtProtectedHeaders",
+			"",
+			"testKey",
+			"",
+			false,
+		},
+		{"key not exist",
+			"testKey",
+			"otherKey",
+			&cert.Chain{},
+			false,
+		},
+		{"key exists",
+			"testKey",
+			"testKey",
+			&cert.Chain{},
+			true,
+		},
+		{"no chain value",
+			"testKey",
+			"testKey",
+			time.Now(),
+			false,
+		},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			meta := &ResolveMetadata{}
+			if tc.inputKey != "" {
+				meta.JwtProtectedHeaders = make(map[string]interface{})
+				meta.JwtProtectedHeaders[tc.inputKey] = tc.inputValue
+			}
+			foundValue, foundOk := meta.GetProtectedHeaderChain(tc.testKey)
+			assert.Equal(t, tc.expectedOk, foundOk)
+			if tc.expectedOk {
+				assert.Equal(t, tc.inputValue, foundValue)
+			}
+		})
+	}
+}