test: Add pytest suite for FLAMES game core logic

tests/test_flames.py

@@ -0,0 +1,77 @@
+"""
+Tests for FLAMES Game core logic.
+"""
+
+def remove_common_chars(name1, name2):
+    name1_list = list(name1)
+    name2_list = list(name2)
+    for char in name1_list[:]:
+        if char in name2_list:
+            name1_list.remove(char)
+            name2_list.remove(char)
+    return name1_list, name2_list
+
+
+def calculate_flames(count):
+    flames = ['F', 'L', 'A', 'M', 'E', 'S']
+    index = 0
+    while len(flames) > 1:
+        index = (index + count - 1) % len(flames)
+        flames.pop(index)
+    return flames[0]
+
+
+def calculate_score(name1, name2, count):
+    total_len = len(name1) + len(name2)
+    matched_chars = total_len - count
+    return 30 + round((matched_chars / total_len) * 70) if total_len > 0 else 0
+
+
+# Tests
+def test_remove_common_chars_basic():
+    n1, n2 = remove_common_chars("alice", "bob")
+    assert len(n1) + len(n2) > 0
+
+
+def test_remove_common_chars_identical():
+    n1, n2 = remove_common_chars("abc", "abc")
+    assert len(n1) + len(n2) == 0
+
+
+def test_flames_result_valid():
+    result = calculate_flames(3)
+    assert result in ['F', 'L', 'A', 'M', 'E', 'S']
+
+
+def test_flames_count_one():
+    result = calculate_flames(1)
+    assert result in ['F', 'L', 'A', 'M', 'E', 'S']
+
+
+def test_flames_count_six():
+    result = calculate_flames(6)
+    assert result in ['F', 'L', 'A', 'M', 'E', 'S']
+
+
+def test_score_range():
+    score = calculate_score("alice", "bob", 4)
+    assert 0 <= score <= 100
+
+
+def test_score_full_match():
+    score = calculate_score("abc", "abc", 0)
+    assert score == 100
+
+
+def test_degenerate_case():
+    n1, n2 = remove_common_chars("abc", "abc")
+    count = len(n1) + len(n2)
+    assert count == 0
+
+
+def test_flames_known_output():
+    # "alice" vs "bob" — count = 4+1 = 5 remaining
+    n1, n2 = remove_common_chars("alice", "bob")
+    count = len(n1) + len(n2)
+    result = calculate_flames(count)
+    assert result in ['F', 'L', 'A', 'M', 'E', 'S']