Add overrideWithMissingCustomEmailClaim test

Signed-off-by: Happy2C0de <46957159+Happy2C0de@users.noreply.github.com>

connector/oidc/oidc_test.go

@@ -110,6 +110,23 @@ func TestHandleCallback(t *testing.T) {
 				"email_verified": true,
 			},
 		},
+		{
+			name:                 "overrideWithMissingCustomEmailClaim",
+			userIDKey:            "", // not configured
+			userNameKey:          "", // not configured
+			overrideClaimMapping: true,
+			emailKey:             "custommail",
+			expectUserID:         "subvalue",
+			expectUserName:       "namevalue",
+			expectedEmailField:   "",
+			token: map[string]interface{}{
+				// no "custommail" claim
+				"sub":            "subvalue",
+				"name":           "namevalue",
+				"email":          "emailvalue",
+				"email_verified": true,
+			},
+		},
 		{
 			name:                      "email_verified not in claims, configured to be skipped",
 			insecureSkipEmailVerified: true,