improve test

vlib/v/tests/builtin_arrays/array_count_test.v

@@ -13,3 +13,24 @@ fn test_zero() {
 	b := [10]int{init: index}
 	assert a.count(it == 1000) == 0
 }
+
+fn test_struct() {
+	struct Abc {
+		x int
+		y int
+		z string
+	}
+
+	a := [Abc{}, Abc{1, 2, 'abc'}, Abc{100, 2, 'def'}, Abc{0, 0, 'a'}]
+
+	assert dump(a.count(it.z.starts_with('a'))) == 2
+	assert dump(a.count(it.y == 2)) == 2
+	assert dump(a.count(it.z.len == 1)) == 1
+	assert dump(a.count(it.z.len < 3)) == 2
+
+	sa := ['aa', 'bb', 'ccc']
+	dump(sa)
+	assert dump(sa.count(it.len < 3)) == 2
+	assert dump(sa.count(it == 'aa')) == 1
+	assert dump(sa.count(it.len == 3)) == 1
+}