Added few edge cases to the test suite

tests/test_goulagsort.py

@@ -5,6 +5,7 @@ import pytest
 from goulag_sort import send_to_goulag
 
 
+
 def test_empty_list():
     assert send_to_goulag([]) == []
 
@@ -14,6 +15,19 @@ def test_single_element():
 def test_already_sorted():
     assert send_to_goulag([10,20,45,50,60,100,150]) == [10,20,45,50,60,100,150]
 
+def test_list_all_equal():
+    assert send_to_goulag([5,5,5,5,5,5,5,5]) == [5,5,5,5,5,5,5,5]
+
+def test_negative_numbers():
+    inputlist = [-4,15,-10,50,13]
+    expectedlist = sorted(copy.deepcopy(inputlist))
+    assert send_to_goulag(inputlist) == expectedlist
+
+def test_float_numbers():
+    inputlist = [1.7,45.2,10.2,5.4,78.2]
+    expectedlist = sorted(copy.deepcopy(inputlist))
+    assert send_to_goulag(inputlist) == expectedlist
+
 def test_reverse_sorted():
     inputlist = [50,40,30,25,14,10,5]
     expectedlist = [5,10,14,25,30,40,50]
@@ -30,12 +44,30 @@ def test_simple_sort():
     expectedlist = sorted(expectedlist)
     assert send_to_goulag(inputlist) == expectedlist
 
+def test_partially_sorted_list():
+    inputlist = [10,20,30,4,12,2,56,15]
+    expectedlist = copy.deepcopy(inputlist)
+    expectedlist = sorted(expectedlist)
+    assert send_to_goulag(inputlist) == expectedlist
+
+
 def test_duplicated_sort():
     inputlist = [10,20,30,30,50,65,100]
     expectedList = sorted(copy.deepcopy(inputlist))
 
     assert send_to_goulag(inputlist) == expectedList
 
+def test_list_with_zero_and_negatives():
+    inputlist = [0,50,-5,2,-10,7,15]
+    expectedList = sorted(copy.deepcopy(inputlist))
+
+    assert send_to_goulag(inputlist) == expectedList
+
+def test_many_duplicates():
+    input_list = [7, 2, 7, 7, 1, 7, 3, 7]
+    expected_list = sorted(input_list[:])
+    assert send_to_goulag(input_list[:]) == expected_list
+
 def test_really_long_sort():
     inputList = [random.randint(1,500000) for _ in range(10000)]
     expectedList = sorted(copy.deepcopy(inputList))