diff --git a/internal/ingress/controller/parser/kongstate/consumer_test.go b/internal/ingress/controller/parser/kongstate/consumer_test.go
index 88b5a6c867..4a6a456fdf 100644
--- a/internal/ingress/controller/parser/kongstate/consumer_test.go
+++ b/internal/ingress/controller/parser/kongstate/consumer_test.go
@@ -9,6 +9,7 @@ import (
 )
 
 func TestConsumer_SetCredential(t *testing.T) {
+	username := "example"
 	type args struct {
 		credType   string
 		consumer   *Consumer
@@ -46,6 +47,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "key-auth without key",
+			args: args{
+				credType: "key-auth",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 		{
 			name: "keyauth_credential",
 			args: args{
@@ -82,6 +101,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "basic-auth without username",
+			args: args{
+				credType: "basic-auth",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 		{
 			name: "basicauth_credential",
 			args: args{
@@ -122,6 +159,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "hmac-auth without username",
+			args: args{
+				credType: "hmac-auth",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 		{
 			name: "hmacauth_credential",
 			args: args{
@@ -166,6 +221,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "oauth2 without client_id",
+			args: args{
+				credType: "oauth2",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 		{
 			name: "jwt",
 			args: args{
@@ -190,6 +263,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "jwt without key",
+			args: args{
+				credType: "jwt",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 		{
 			name: "jwt_secret",
 			args: args{
@@ -230,6 +321,24 @@ func TestConsumer_SetCredential(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "acl without group",
+			args: args{
+				credType: "acl",
+				consumer: &Consumer{
+					Consumer: kong.Consumer{
+						Username: &username,
+					},
+				},
+				credConfig: map[string]string{},
+			},
+			result: &Consumer{
+				Consumer: kong.Consumer{
+					Username: &username,
+				},
+			},
+			wantErr: true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {