Wire in new env vars for user info testing

Signed-off-by: Monis Khan <mok@vmware.com>

internal/oidc/callback/callback_handler.go

@@ -269,7 +269,7 @@ func getGroupsFromUpstreamIDToken(
 			"configuredGroupsClaim", upstreamIDPConfig.GetGroupsClaim(),
 			"groupsClaim", groupsClaim,
 		)
-		return nil, httperr.New(http.StatusUnprocessableEntity, "no groups claim in upstream ID token")
+		return nil, nil // the upstream IDP may have omitted the claim if the user has no groups
 	}
 
 	groupsAsArray, okAsArray := groupsAsInterface.([]string)

internal/oidc/callback/callback_handler_test.go

@@ -430,8 +430,16 @@ func TestCallbackEndpoint(t *testing.T) {
 			method:                            http.MethodGet,
 			path:                              newRequestPath().WithState(happyState).String(),
 			csrfCookie:                        happyCSRFCookie,
-			wantStatus:                        http.StatusUnprocessableEntity,
-			wantBody:                          "Unprocessable Entity: no groups claim in upstream ID token\n",
+			wantStatus:                        http.StatusFound,
+			wantRedirectLocationRegexp:        happyDownstreamRedirectLocationRegexp,
+			wantBody:                          "",
+			wantDownstreamIDTokenSubject:      upstreamIssuer + "?sub=" + upstreamSubject,
+			wantDownstreamIDTokenUsername:     upstreamUsername,
+			wantDownstreamRequestedScopes:     happyDownstreamScopesRequested,
+			wantDownstreamGrantedScopes:       happyDownstreamScopesGranted,
+			wantDownstreamNonce:               downstreamNonce,
+			wantDownstreamPKCEChallenge:       downstreamPKCEChallenge,
+			wantDownstreamPKCEChallengeMethod: downstreamPKCEChallengeMethod,
 			wantExchangeAndValidateTokensCall: happyExchangeAndValidateTokensArgs,
 		},
 		{