Add another test

test.py

@@ -238,6 +238,24 @@ def test_correlations(nxdirty, nydirty, nrow, nchan, epsilon, du, dv, weight):
         assert_allclose(np.zeros_like(y1), y1.imag)
 
 
+@pmp("nrow", (1, 1000))
+@pmp("nchan", (1, 10))
+@pmp("epsilon", (1e-2, 1e-7, 2e-12))
+@pmp("weight", (True, False))
+def test_no_correlation(nrow, nchan, epsilon, weight):
+    np.random.seed(42)
+    bl, conf, idx = _init_gridder(128, 128, epsilon, nchan, nrow)
+    wgt = np.random.rand(*idx.shape) if weight else None
+    w = conf.W()
+    for uu in range(-2*w, 2*w):
+        for vv in range(-2*w, 2*w):
+            if abs(uu) >= w or abs(vv) >= w:
+                with pytest.raises(RuntimeError):
+                    ng.get_correlations(bl, conf, idx, uu, vv, wgt)
+            else:
+                ng.get_correlations(bl, conf, idx, uu, vv, wgt)
+
+
 @pmp('epsilon', [1e-2, 1e-4, 1e-7, 1e-10, 1e-11, 1e-12, 2e-13])
 @pmp('nxdirty', [12, 128])
 @pmp('nydirty', [4, 12, 128])