test_suggestion_list: improve readability

Replicates graphql/graphql-js@7a4cbbb

Author: Cito

tests/pyutils/test_suggesion_list.py

@@ -1,48 +1,52 @@
+from typing import List
+
 from graphql.pyutils import suggestion_list
 
 
+def expect_suggestions(input: str, options: List[str], expected: List[str]) -> None:
+    assert suggestion_list(input, options) == expected
+
+
 def describe_suggestion_list():
     def returns_results_when_input_is_empty():
-        assert suggestion_list("", ["a"]) == ["a"]
+        expect_suggestions("", ["a"], ["a"])
 
     def returns_empty_array_when_there_are_no_options():
-        assert suggestion_list("input", []) == []
+        expect_suggestions("input", [], [])
 
     def returns_options_with_small_lexical_distance():
-        assert suggestion_list("greenish", ["green"]) == ["green"]
-        assert suggestion_list("green", ["greenish"]) == ["greenish"]
+        expect_suggestions("greenish", ["green"], ["green"])
+        expect_suggestions("green", ["greenish"], ["greenish"])
 
     def returns_options_with_different_case():
-        assert suggestion_list("verylongstring", ["VERYLONGSTRING"]) == [
-            "VERYLONGSTRING"
-        ]
+        expect_suggestions("verylongstring", ["VERYLONGSTRING"], ["VERYLONGSTRING"])
 
-        assert suggestion_list("VERYLONGSTRING", ["verylongstring"]) == [
-            "verylongstring"
-        ]
+        expect_suggestions("VERYLONGSTRING", ["verylongstring"], ["verylongstring"])
 
-        assert suggestion_list("VERYLONGSTRING", ["VeryLongString"]) == [
-            "VeryLongString"
-        ]
+        expect_suggestions("VERYLONGSTRING", ["VeryLongString"], ["VeryLongString"])
 
     def returns_options_with_transpositions():
-        assert suggestion_list("agr", ["arg"]) == ["arg"]
+        expect_suggestions("agr", ["arg"], ["arg"])
 
-        assert suggestion_list("214365879", ["123456789"]) == ["123456789"]
+        expect_suggestions("214365879", ["123456789"], ["123456789"])
 
     def returns_options_sorted_based_on_lexical_distance():
-        assert suggestion_list("abc", ["a", "ab", "abc"]) == ["abc", "ab"]
+        expect_suggestions("abc", ["a", "ab", "abc"], ["abc", "ab"])
 
-        assert suggestion_list(
-            "GraphQl", ["graphics", "SQL", "GraphQL", "quarks", "mark"]
-        ) == ["GraphQL", "graphics"]
+        expect_suggestions(
+            "GraphQl",
+            ["graphics", "SQL", "GraphQL", "quarks", "mark"],
+            ["GraphQL", "graphics"],
+        )
 
     def returns_options_with_the_same_lexical_distance_sorted_lexicographically():
-        assert suggestion_list("a", ["az", "ax", "ay"]) == ["ax", "ay", "az"]
+        expect_suggestions("a", ["az", "ax", "ay"], ["ax", "ay", "az"])
 
-        assert suggestion_list("boo", ["moo", "foo", "zoo"]) == ["foo", "moo", "zoo"]
+        expect_suggestions("boo", ["moo", "foo", "zoo"], ["foo", "moo", "zoo"])
 
     def returns_options_sorted_first_by_lexical_distance_then_lexicographically():
-        assert suggestion_list(
-            "csutomer", ["store", "customer", "stomer", "some", "more"]
-        ) == ["customer", "stomer", "some", "store"]
+        expect_suggestions(
+            "csutomer",
+            ["store", "customer", "stomer", "some", "more"],
+            ["customer", "stomer", "some", "store"],
+        )