From de56ff1659d753c22ac5f7b7b72791a184c85ab4 Mon Sep 17 00:00:00 2001
From: "akmkhale@ansatnuc04" <akm.khaled.talukder@intel.com>
Date: Fri, 17 Feb 2023 10:52:07 -0600
Subject: [PATCH] Adding a rigorous test for caching

Breaking strings into 80 cols

Rename function
---
 numba_dpex/tests/kernel_tests/test_caching.py | 96 ++++++++++++++++++-
 1 file changed, 95 insertions(+), 1 deletion(-)

diff --git a/numba_dpex/tests/kernel_tests/test_caching.py b/numba_dpex/tests/kernel_tests/test_caching.py
index 9d54b14479..b7e92838b7 100644
--- a/numba_dpex/tests/kernel_tests/test_caching.py
+++ b/numba_dpex/tests/kernel_tests/test_caching.py
@@ -2,12 +2,14 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-import dpctl
+import string
+
 import dpctl.tensor as dpt
 import numpy as np
 import pytest
 
 import numba_dpex as dpex
+from numba_dpex.core.caching import LRUCache
 from numba_dpex.core.kernel_interface.dispatcher import (
     JitKernel,
     get_ordered_arg_access_types,
@@ -15,6 +17,98 @@
 from numba_dpex.tests._helper import filter_strings
 
 
+def test_LRUcache_operations():
+    """Test rigorous caching operations.
+
+    Performs different permutations of caching operations
+    and check if the state of the cache is correct.
+    """
+    alphabet = list(string.ascii_lowercase)
+    cache = LRUCache(name="testcache", capacity=4, pyfunc=None)
+    assert str(cache) == "{}" and cache.head is None and cache.tail is None
+
+    states = []
+    for i in range(4):
+        cache.put(i, alphabet[i])
+        tail_key = cache.get(cache.tail.key)
+        head_key = cache.get(cache.head.key)
+        states.append((cache, tail_key, head_key))
+    assert (
+        str(states)
+        == "["
+        + "({(2: c), (1: b), (3: d), (0: a)}, 'a', 'a'), "
+        + "({(2: c), (1: b), (3: d), (0: a)}, 'b', 'a'), "
+        + "({(2: c), (1: b), (3: d), (0: a)}, 'c', 'b'), "
+        + "({(2: c), (1: b), (3: d), (0: a)}, 'd', 'a')"
+        + "]"
+    )
+
+    states = []
+    picking_order = [3, 1, 0, 2, 2]
+    for index in picking_order:
+        value = cache.get(index)
+        states.append((value, cache, cache.head, cache.tail))
+    assert (
+        str(states)
+        == "["
+        + "('d', {(3: d), (1: b), (0: a), (2: c)}, (2: c), (3: d)), "
+        + "('b', {(3: d), (1: b), (0: a), (2: c)}, (2: c), (1: b)), "
+        + "('a', {(3: d), (1: b), (0: a), (2: c)}, (2: c), (0: a)), "
+        + "('c', {(3: d), (1: b), (0: a), (2: c)}, (3: d), (2: c)), "
+        + "('c', {(3: d), (1: b), (0: a), (2: c)}, (3: d), (2: c))"
+        + "]"
+    )
+
+    states = []
+    for i in range(5, 10):
+        cache.put(i, alphabet[i])
+        tail_key = cache.get(cache.tail.key)
+        head_key = cache.get(cache.head.key)
+        states.append((cache, tail_key, head_key))
+    assert (
+        str(states)
+        == "["
+        + "({(8: i), (2: c), (9: j), (1: b)}, 'f', 'b'), "
+        + "({(8: i), (2: c), (9: j), (1: b)}, 'g', 'c'), "
+        + "({(8: i), (2: c), (9: j), (1: b)}, 'h', 'b'), "
+        + "({(8: i), (2: c), (9: j), (1: b)}, 'i', 'c'), "
+        + "({(8: i), (2: c), (9: j), (1: b)}, 'j', 'b')"
+        + "]"
+    )
+    assert str(cache.evicted) == "{3: 'd', 0: 'a', 5: 'f', 6: 'g', 7: 'h'}"
+
+    picking_order = [2, 1, 3]
+    states = []
+    for index in picking_order:
+        value = cache.get(index)
+        states.append((value, cache, cache.head, cache.tail))
+    assert (
+        str(states)
+        == "["
+        + "('c', {(9: j), (2: c), (1: b), (3: d)}, (8: i), (2: c)), "
+        + "('b', {(9: j), (2: c), (1: b), (3: d)}, (8: i), (1: b)), "
+        + "('d', {(9: j), (2: c), (1: b), (3: d)}, (9: j), (3: d))"
+        + "]"
+    )
+    assert str(cache.evicted) == "{0: 'a', 5: 'f', 6: 'g', 7: 'h', 8: 'i'}"
+
+    cache.put(0, "x")
+    assert (
+        str(cache) == "{(2: c), (1: b), (3: d), (0: x)}"
+        and str(cache.head) == "(2: c)"
+        and str(cache.tail) == "(0: x)"
+    )
+    assert str(cache.evicted) == "{5: 'f', 6: 'g', 7: 'h', 8: 'i', 9: 'j'}"
+
+    cache.put(6, "y")
+    assert (
+        str(cache) == "{(1: b), (3: d), (0: x), (6: y)}"
+        and str(cache.head) == "(1: b)"
+        and str(cache.tail) == "(6: y)"
+    )
+    assert str(cache.evicted) == "{5: 'f', 7: 'h', 8: 'i', 9: 'j', 2: 'c'}"
+
+
 @pytest.mark.parametrize("filter_str", filter_strings)
 def test_caching_hit_counts(filter_str):
     """Tests the correct number of cache hits.