diff --git a/tests/alloydb/alloydb_integration_test.go b/tests/alloydb/alloydb_integration_test.go
index 468af718f5..a89e1c23b0 100644
--- a/tests/alloydb/alloydb_integration_test.go
+++ b/tests/alloydb/alloydb_integration_test.go
@@ -1129,26 +1129,26 @@ func TestAlloyDBCreateCluster(t *testing.T) {
 		{
 			name:           "api failure",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c2-api-failure", "password": "p1"}`,
-			want:           "internal api error",
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"error processing GCP request: error creating AlloyDB cluster: googleapi: Error 500: internal api error"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing project",
 			body:           `{"location": "l1", "cluster": "c1", "password": "p1"}`,
-			want:           `parameter \"project\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"project\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing cluster",
 			body:           `{"project": "p1", "location": "l1", "password": "p1"}`,
-			want:           `parameter \"cluster\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"cluster\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing password",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1"}`,
-			want:           `parameter \"password\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"password\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 	}
 
@@ -1245,26 +1245,26 @@ func TestAlloyDBCreateInstance(t *testing.T) {
 		{
 			name:           "missing project",
 			body:           `{"location": "l1", "cluster": "c1", "instance": "i1", "instanceType": "PRIMARY"}`,
-			want:           `parameter \"project\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"project\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing cluster",
 			body:           `{"project": "p1", "location": "l1", "instance": "i1", "instanceType": "PRIMARY"}`,
-			want:           `parameter \"cluster\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"cluster\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing location",
 			body:           `{"project": "p1", "cluster": "c1", "instance": "i1", "instanceType": "PRIMARY"}`,
-			want:           `parameter \"location\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"location\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing instance",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "instanceType": "PRIMARY"}`,
-			want:           `parameter \"instance\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"instance\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "invalid instanceType",
@@ -1371,50 +1371,50 @@ func TestAlloyDBCreateUser(t *testing.T) {
 		{
 			name:           "api failure",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "user": "u3-api-failure", "userType": "ALLOYDB_IAM_USER"}`,
-			want:           "user internal api error",
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"error processing GCP request: error creating AlloyDB user: googleapi: Error 500: user internal api error"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing project",
 			body:           `{"location": "l1", "cluster": "c1", "user": "u-fail", "userType": "ALLOYDB_IAM_USER"}`,
-			want:           `parameter \"project\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"project\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing cluster",
 			body:           `{"project": "p1", "location": "l1", "user": "u-fail", "userType": "ALLOYDB_IAM_USER"}`,
-			want:           `parameter \"cluster\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"cluster\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing location",
 			body:           `{"project": "p1", "cluster": "c1", "user": "u-fail", "userType": "ALLOYDB_IAM_USER"}`,
-			want:           `parameter \"location\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"location\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing user",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "userType": "ALLOYDB_IAM_USER"}`,
-			want:           `parameter \"user\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"user\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing userType",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "user": "u-fail"}`,
-			want:           `parameter \"userType\" is required`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"parameter \"userType\" is required"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "missing password for builtin user",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "user": "u-fail", "userType": "ALLOYDB_BUILT_IN"}`,
-			want:           `password is required when userType is ALLOYDB_BUILT_IN`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"password is required when userType is ALLOYDB_BUILT_IN"}`,
+			wantStatusCode: http.StatusOK,
 		},
 		{
 			name:           "invalid userType",
 			body:           `{"project": "p1", "location": "l1", "cluster": "c1", "user": "u-fail", "userType": "invalid"}`,
-			want:           `invalid or missing 'userType' parameter; expected 'ALLOYDB_BUILT_IN' or 'ALLOYDB_IAM_USER'`,
-			wantStatusCode: http.StatusBadRequest,
+			want:           `{"error":"invalid or missing 'userType' parameter; expected 'ALLOYDB_BUILT_IN' or 'ALLOYDB_IAM_USER'"}`,
+			wantStatusCode: http.StatusOK,
 		},
 	}