void Test_remove_not_existing()
{
MyHashTableSeperateChaining <string, int> table = new MyHashTableSeperateChaining <string, int>();
table.Insert("a", 1);
table.Insert("b", 2);
table.Insert("c", 3);
Assert.Throws <KeyNotFoundException>(() => table.Remove("z"));
}
void Test_remove_null()
{
MyHashTableSeperateChaining <string, int> table = new MyHashTableSeperateChaining <string, int>();
table.Insert("a", 1);
table.Insert("b", 2);
table.Insert("c", 3);
Assert.Throws <ArgumentNullException>(() => table.Remove(null));
}
void Test_using_enumerator()
{
MyHashTableSeperateChaining <string, string> table = new MyHashTableSeperateChaining <string, string>();
table.Insert("a", "1");
table.Insert("b", "2");
table.Insert("c", "3");
using (var e = table.GetEnumerator())
Assert.NotNull(e);
}
void Test_remove()
{
MyHashTableSeperateChaining <string, int> table = new MyHashTableSeperateChaining <string, int>();
table.Insert("a", 1);
table.Insert("b", 2);
table.Insert("c", 3);
table.Insert("d", 4);
Assert.Equal(2, table.Remove("b"));
Assert.True(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.True(table.ContainsKey("c"));
Assert.True(table.ContainsKey("d"));
Assert.Equal(3, table.Remove("c"));
Assert.True(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.False(table.ContainsKey("c"));
Assert.True(table.ContainsKey("d"));
Assert.Equal(1, table.Remove("a"));
Assert.False(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.False(table.ContainsKey("c"));
Assert.True(table.ContainsKey("d"));
Assert.Equal(4, table.Remove("d"));
Assert.False(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.False(table.ContainsKey("c"));
Assert.False(table.ContainsKey("d"));
Assert.True(table.IsEmpty());
}
void Test_values()
{
string[] expectedValues = { "first", "second", "third" };
MyHashTableSeperateChaining <string, string> table = new MyHashTableSeperateChaining <string, string>();
table.Insert("a", "first");
table.Insert("b", "second");
table.Insert("c", "third");
var values = table.Values();
Assert.Equal(3, values.Count);
values.ForEach(v => {
int index = Array.IndexOf(expectedValues, v);
Assert.NotEqual(-1, index);
expectedValues[index] = null;
});
foreach (var k in expectedValues)
{
Assert.Null(k);
}
}
void Test_keys()
{
string[] expectedKeys = { "a", "b", "c" };
MyHashTableSeperateChaining <string, int> table = new MyHashTableSeperateChaining <string, int>();
table.Insert("a", 1);
table.Insert("b", 2);
table.Insert("c", 3);
var keys = table.Keys();
Assert.Equal(3, keys.Count);
keys.ForEach(k => {
int index = Array.IndexOf(expectedKeys, k);
Assert.NotEqual(-1, index);
expectedKeys[index] = null;
});
foreach (var k in expectedKeys)
{
Assert.Null(k);
}
}
void Test_get_enumerator()
{
string[] sortedKeys = { "b", "c", "a" };
MyHashTableSeperateChaining <string, string> table = new MyHashTableSeperateChaining <string, string>();
table.Insert("a", "1");
table.Insert("b", "2");
table.Insert("c", "3");
List <string> keys = new List <string>();
foreach (var k in table)
{
keys.Add(k);
int index = Array.FindIndex(sortedKeys, s => k == s);
sortedKeys[index] = null;
}
foreach (var s in sortedKeys)
{
Assert.Null(s);
}
Assert.Equal(3, keys.Count);
table.Clear();
keys.Clear();
table.Insert("h", "1");
table.Insert("km", "2");
table.Insert("zy", "3");
sortedKeys = new string[] { "h", "km", "zy" };
foreach (var k in table)
{
keys.Add(k);
int index = Array.FindIndex(sortedKeys, s => k == s);
sortedKeys[index] = null;
}
foreach (var s in sortedKeys)
{
Assert.Null(s);
}
Assert.Equal(3, keys.Count);
}
void Test_insert_null_key()
{
MyHashTableSeperateChaining <string, string> tbl = new MyHashTableSeperateChaining <string, string>();
Assert.Throws <ArgumentNullException>(() => tbl.Insert(null, "test"));
}
void Test_exhaustively()
{
MyHashTableSeperateChaining <string, string> table = new MyHashTableSeperateChaining <string, string>();
table.Insert("a", "1");
table.Insert("b", "2");
table.Insert("c", "3");
Assert.Equal(3, table.Size);
Assert.False(table.IsEmpty());
table.Remove("a");
Assert.False(table.ContainsKey("a"));
Assert.True(table.ContainsKey("b"));
Assert.True(table.ContainsKey("c"));
Assert.Equal(2, table.Size);
var keys = table.Keys();
var values = table.Values();
Assert.Equal(2, keys.Count);
Assert.Equal(2, values.Count);
table.Clear();
Assert.True(table.IsEmpty());
Assert.False(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.False(table.ContainsKey("c"));
var keys2 = table.Keys();
var values2 = table.Values();
Assert.Empty(keys2);
Assert.Empty(values2);
table.Insert("h", "100");
table.Insert("z", "255");
table.Insert("z", "300");
Assert.Equal(2, table.Size);
Assert.False(table.IsEmpty());
Assert.Equal("300", table.GetValue("z"));
Assert.False(table.ContainsKey("a"));
Assert.False(table.ContainsKey("b"));
Assert.False(table.ContainsKey("c"));
Assert.True(table.ContainsKey("h"));
Assert.True(table.ContainsKey("z"));
var keys3 = table.Keys();
var values3 = table.Values();
Assert.Equal(2, keys3.Count);
Assert.Equal(2, values3.Count);
table.Remove("z");
Assert.Equal(1, table.Size);
Assert.False(table.IsEmpty());
Assert.True(table.ContainsKey("h"));
Assert.False(table.ContainsKey("z"));
table.Remove("h");
Assert.True(table.IsEmpty());
Assert.False(table.ContainsKey("h"));
Assert.False(table.ContainsKey("z"));
var keys4 = table.Keys();
var values4 = table.Values();
Assert.Empty(keys4);
Assert.Empty(values4);
Assert.Throws <ArgumentException>(() => table.Remove("z"));
}