from sklearn.datasets import load_iris
from sklearn.neighbors import KNeighborsClassifier
from sklearn.metrics import accuracy_score

# Load the iris dataset
iris = load_iris()

# Create a KNeighborsClassifier model
model = KNeighborsClassifier()

# Fit the model to the entire dataset
model.fit(iris.data, iris.target)

# Use the model to predict on new, unseen data
y_pred = model.predict(iris.data)

# Calculate the accuracy score on the test data
accuracy = accuracy_score(iris.target, y_pred)

print("Test accuracy:", accuracy)