There is a sample dataset under the Saved Datasets option in ML Studio called Iris Two Class Data. Use this to build a K-Means Clustering model with K (Number of Centroids) = 2.
This is not a test, but did you notice that all the instances of one class fall in the same cluster? Don't be confused between the cluster number as 0 and 1 because it is just a number and it won't harm even if you read the cluster 0 as 1 and 1 as 0.