mono/mcs/class/corlib/Test/System.Collections/HashtableTest.cs

// HashtableTest.cs - NUnit Test Cases for the System.Collections.Hashtable class
//
//
// (C) Ximian, Inc.  http://www.ximian.com
// 


using System;
using System.Collections;

using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;

using NUnit.Framework;



namespace MonoTests.System.Collections {


/// <summary>Hashtable test.</summary>
[TestFixture]
public class HashtableTest : Assertion {

        [Test]
	public void TestCtor1() {
		Hashtable h = new Hashtable();
		AssertNotNull("No hash table", h);
	}

        [Test]
	public void TestCtor2() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable(null);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null hashtable error not thrown", 
			       errorThrown);
		}
		{
			string[] keys = {"this", "is", "a", "test"};
			char[] values = {'a', 'b', 'c', 'd'};
			Hashtable h1 = new Hashtable();
			for (int i = 0; i < keys.Length; i++) {
				h1[keys[i]] = values[i];
			}
			Hashtable h2 = new Hashtable(h1);
			for (int i = 0; i < keys.Length; i++) {
				AssertEquals("No match for key " + keys[i],
					     values[i], h2[keys[i]]);
			}
		}
	}

        [Test]
        [ExpectedException (typeof (ArgumentOutOfRangeException))]
        public void TestCtor3 ()
        {
                Hashtable h = new Hashtable ();
                Hashtable hh = new Hashtable (h, Single.NaN);
        }

        [Test]
        [ExpectedException (typeof (ArgumentException))]
        public void TestCtor4 ()
        {
                Hashtable ht = new Hashtable (Int32.MaxValue, 0.1f, null, null);
        }
        
	// TODO - Ctors for capacity and load (how to test? any access?)
        // TODO - Ctors with IComparer, IHashCodeProvider, Serialization

        [Test]	
	public void TestCount() {
		Hashtable h = new Hashtable();
		AssertEquals("new table - count zero", 0, h.Count);
		int max = 100;
		for (int i = 1; i <= max; i++) {
			h[i] = i;
			AssertEquals("Count wrong for " + i,
				     i, h.Count);
		}
		for (int i = 1; i <= max; i++) {
			h[i] = i * 2;
			AssertEquals("Count shouldn't change at " + i,
				     max, h.Count);
		}
	}

        [Test]        
	public void TestIsFixedSize() {
		Hashtable h = new Hashtable();
		AssertEquals("hashtable not fixed by default",
			     false, h.IsFixedSize);
		// TODO - any way to get a fixed-size hashtable?
	}

	public void TestIsReadOnly() {
		Hashtable h = new Hashtable();
		AssertEquals("hashtable not read-only by default",
			     false, h.IsReadOnly);
		// TODO - any way to get a read-only hashtable?
	}

        [Test]        
	public void TestIsSynchronized() {
		Hashtable h = new Hashtable();
		Assert("hashtable not synced by default", !h.IsSynchronized);
		Hashtable h2 = Hashtable.Synchronized(h);
		Assert("hashtable should by synced", h2.IsSynchronized);
	}

        [Test]
	public void TestItem() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				Object o = h[null];
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null hashtable error not thrown", 
			       errorThrown);
		}
		// TODO - if read-only and/or fixed-size is possible,
		//        test 'NotSupportedException' here

		{
			Hashtable h = new Hashtable();
			int max = 100;
			for (int i = 1; i <= max; i++) {
				h[i] = i;
				AssertEquals("value wrong for " + i,
					     i, h[i]);
			}
		}
	}

        [Test]
	public void TestKeys() {
		string[] keys = {"this", "is", "a", "test"};
		char[] values1 = {'a', 'b', 'c', 'd'};
		char[] values2 = {'e', 'f', 'g', 'h'};
		Hashtable h1 = new Hashtable();
		for (int i = 0; i < keys.Length; i++) {
			h1[keys[i]] = values1[i];
		}
		AssertEquals("keys wrong size",
			     keys.Length, h1.Keys.Count);
		for (int i = 0; i < keys.Length; i++) {
			h1[keys[i]] = values2[i];
		}
		AssertEquals("keys wrong size 2",
			     keys.Length, h1.Keys.Count);
	}

	// TODO - SyncRoot
        [Test]        
	public void TestValues() {
		string[] keys = {"this", "is", "a", "test"};
		char[] values1 = {'a', 'b', 'c', 'd'};
		char[] values2 = {'e', 'f', 'g', 'h'};
		Hashtable h1 = new Hashtable();
		for (int i = 0; i < keys.Length; i++) {
			h1[keys[i]] = values1[i];
		}
		AssertEquals("values wrong size",
			     keys.Length, h1.Values.Count);
		for (int i = 0; i < keys.Length; i++) {
			h1[keys[i]] = values2[i];
		}
		AssertEquals("values wrong size 2",
			     keys.Length, h1.Values.Count);
	}

	[Test]
	public void TestAdd() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h.Add(null, "huh?");
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null add error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h.Add('a', 1);
				h.Add('a', 2);
			} catch (ArgumentException) {
				errorThrown = true;
			}
			Assert("re-add error not thrown", 
			       errorThrown);
		}
		// TODO - hit NotSupportedException
		{
			Hashtable h = new Hashtable();
			int max = 100;
			for (int i = 1; i <= max; i++) {
				h.Add(i, i);
				AssertEquals("value wrong for " + i,
					     i, h[i]);
			}
		}
	}

        [Test]
	public void TestClear() {
		// TODO - hit NotSupportedException
		Hashtable h = new Hashtable();
		AssertEquals("new table - count zero", 0, h.Count);
		int max = 100;
		for (int i = 1; i <= max; i++) {
			h[i] = i;
		}
		Assert("table don't gots stuff", h.Count > 0);
		h.Clear();
		AssertEquals("Table should be cleared",
			     0, h.Count);
	}

        [Test]
	public void TestClone() {
		{
			char[] c1 = {'a', 'b', 'c'};
			char[] c2 = {'d', 'e', 'f'};
			Hashtable h1 = new Hashtable();
			for (int i = 0; i < c1.Length; i++) {
				h1[c1[i]] = c2[i];
			}
			Hashtable h2 = (Hashtable)h1.Clone();
			AssertNotNull("got no clone!", h2);
			AssertNotNull("clone's got nothing!", h2[c1[0]]);
			for (int i = 0; i < c1.Length; i++) {
				AssertEquals("Hashtable match", 
					     h1[c1[i]], h2[c1[i]]);
			}
		}
		{
			char[] c1 = {'a', 'b', 'c'};
			char[] c20 = {'1', '2'};
			char[] c21 = {'3', '4'};
			char[] c22 = {'5', '6'};
			char[][] c2 = {c20, c21, c22};
			Hashtable h1 = new Hashtable();
			for (int i = 0; i < c1.Length; i++) {
				h1[c1[i]] = c2[i];
			}
			Hashtable h2 = (Hashtable)h1.Clone();
			AssertNotNull("got no clone!", h2);
			AssertNotNull("clone's got nothing!", h2[c1[0]]);
			for (int i = 0; i < c1.Length; i++) {
				AssertEquals("Hashtable match", 
					     h1[c1[i]], h2[c1[i]]);
			}

			((char[])h1[c1[0]])[0] = 'z';
			AssertEquals("shallow copy", h1[c1[0]], h2[c1[0]]);
		}
	}

        [Test]
	public void TestContains() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				bool result = h.Contains(null);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null add error not thrown", 
			       errorThrown);
		}
		{
			Hashtable h = new Hashtable();
			h['a'] = "blue";
			Assert("'a'? it's in there!", h.Contains('a'));
			Assert("'b'? no way!", !h.Contains('b'));
		}
	}

        [Test]
	public void TestContainsKey() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				bool result = h.ContainsKey(null);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null add error not thrown", 
			       errorThrown);
		}
		{
			Hashtable h = new Hashtable();
			h['a'] = "blue";
			Assert("'a'? it's in there!", h.ContainsKey('a'));
			Assert("'b'? no way!", !h.ContainsKey('b'));
		}
	}

        [Test]        
	public void TestContainsValue() {
		{
			Hashtable h = new Hashtable();
			h['a'] = "blue";
			Assert("blue? it's in there!", 
			       h.ContainsValue("blue"));
			Assert("green? no way!", 
			       !h.ContainsValue("green"));
		}
	}

        [Test]        
	public void TestCopyTo() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h.CopyTo(null, 0);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null hashtable error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				Object[] o = new Object[1];
				h.CopyTo(o, -1);
			} catch (ArgumentOutOfRangeException) {
				errorThrown = true;
			}
			Assert("out of range error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				Object[,] o = new Object[1,1];
				h.CopyTo(o, 1);
			} catch (ArgumentException) {
				errorThrown = true;
			}
			Assert("multi-dim array error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h['a'] = 1; // no error if table is empty
				Object[] o = new Object[5];
				h.CopyTo(o, 5);
			} catch (ArgumentException) {
				errorThrown = true;
			}
			Assert("no room in array error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h['a'] = 1;
				h['b'] = 2;
				h['c'] = 2;
				Object[] o = new Object[2];
				h.CopyTo(o, 0);
			} catch (ArgumentException) {
				errorThrown = true;
			}
			Assert("table too big error not thrown", 
			       errorThrown);
		}
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h["blue"] = 1;
				h["green"] = 2;
				h["red"] = 3;
				Char[] o = new Char[3];
				h.CopyTo(o, 0);
			} catch (InvalidCastException) {
				errorThrown = true;
			}
			Assert("invalid cast error not thrown", 
			       errorThrown);
		}

		{
			Hashtable h = new Hashtable();
			h['a'] = 1;
			h['b'] = 2;
			DictionaryEntry[] o = new DictionaryEntry[2];
			h.CopyTo(o,0);
			AssertEquals("first copy fine.", 'a', o[0].Key);
			AssertEquals("first copy fine.", 1, o[0].Value);
			AssertEquals("second copy fine.", 'b', o[1].Key);
			AssertEquals("second copy fine.", 2, o[1].Value);
		}
	}

        [Test]        
	public void TestGetEnumerator() {
		String[] s1 = {"this", "is", "a", "test"};
		Char[] c1 = {'a', 'b', 'c', 'd'};
		Hashtable h1 = new Hashtable();
		for (int i = 0; i < s1.Length; i++) {
			h1[s1[i]] = c1[i];
		}
		IDictionaryEnumerator en = h1.GetEnumerator();
		AssertNotNull("No enumerator", en);
		
		for (int i = 0; i < s1.Length; i++) {
			en.MoveNext();
			Assert("Not enumerating for " + en.Key, 
			       Array.IndexOf(s1, en.Key) >= 0);
			Assert("Not enumerating for " + en.Value, 
			       Array.IndexOf(c1, en.Value) >= 0);
		}
	}

	// TODO - GetObjectData
	// TODO - OnDeserialization
        [Test]
	public void TestSerialization () {
		Random r = new Random();
		string filename = "hashtable_" + r.Next(99999).ToString() + ".dat";
		Hashtable table1 = new Hashtable();
		Hashtable table2;
    	Stream str;
	    BinaryFormatter formatter = new BinaryFormatter();

		for (int i = 0; i < 100; i++) {
			table1[i] = "TestString Key: " + i.ToString();
		}
		str = File.OpenWrite(filename);
    	formatter.Serialize(str, table1);
	    str.Close();

		str = File.OpenRead(filename);
		table2 = (Hashtable) formatter.Deserialize(str);
		str.Close();

		File.Delete(filename);

		bool result;
		foreach (DictionaryEntry de in table1) {
			int key1 = (int) de.Key;
			string val1 = (string) de.Value;
			string val2 = (string) table2[key1];
			if (val2 != val1) {
				result = false;
			}
		}
		result = true;

		Assert("Binary Serialization Error", result);
	}

        [Test]        
	public void TestRemove() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = new Hashtable();
				h.Remove(null);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null hashtable error not thrown", 
			       errorThrown);
		}
		{
			string[] keys = {"this", "is", "a", "test"};
			char[] values = {'a', 'b', 'c', 'd'};
			Hashtable h = new Hashtable();
			for (int i = 0; i < keys.Length; i++) {
				h[keys[i]] = values[i];
			}
			AssertEquals("not enough in table",
				     4, h.Count);
			h.Remove("huh?");
			AssertEquals("not enough in table",
				     4, h.Count);
			h.Remove("this");
			AssertEquals("Wrong count in table",
				     3, h.Count);
			h.Remove("this");
			AssertEquals("Wrong count in table",
				     3, h.Count);
		}
	}

        [Test]        
	public void TestSynchronized() {
		{
			bool errorThrown = false;
			try {
				Hashtable h = Hashtable.Synchronized(null);
			} catch (ArgumentNullException) {
				errorThrown = true;
			}
			Assert("null hashtable error not thrown", 
			       errorThrown);
		}
		{
			Hashtable h = new Hashtable();
			Assert("hashtable not synced by default", 
			       !h.IsSynchronized);
			Hashtable h2 = Hashtable.Synchronized(h);
			Assert("hashtable should by synced", 
			       h2.IsSynchronized);
		}
	}
	
	
	protected Hashtable ht;
	private static Random rnd;
	
	[SetUp]
	public void SetUp() {
		ht=new Hashtable();
		rnd=new Random();
	}
	
	private void SetDefaultData() {
		ht.Clear();
		ht.Add("k1","another");
		ht.Add("k2","yet");
		ht.Add("k3","hashtable");
	}
	
        [Test]
	public void TestAddRemoveClear() {
		ht.Clear();
		Assert(ht.Count==0);
		
		SetDefaultData();
		Assert(ht.Count==3);
		
		bool thrown=false;
		try {
			ht.Add("k2","cool");
		} catch (ArgumentException) {thrown=true;}
		Assert("Must throw ArgumentException!",thrown);
		
		ht["k2"]="cool";
		Assert(ht.Count==3);
		Assert(ht["k2"].Equals("cool"));
		
	}

        [Test]	
	public void TestCopyTo2() {
		SetDefaultData();
		Object[] entries=new Object[ht.Count];
		ht.CopyTo(entries,0);
		Assert("Not an entry.",entries[0] is DictionaryEntry);
	}
	
        [Test]	
	public void TestUnderHeavyLoad() {
		ht.Clear();
		int max=100000;
		String[] cache=new String[max*2];
		int n=0;
		
		for (int i=0;i<max;i++) {
			int id=rnd.Next()&0xFFFF;
			String key=""+id+"-key-"+id;
			String val="value-"+id;
			if (ht[key]==null) {
				ht[key]=val;
				cache[n]=key;
				cache[n+max]=val;
				n++;
			}
		}
		
		Assert(ht.Count==n);
		
		for (int i=0;i<n;i++) {
			String key=cache[i];
			String val=ht[key] as String;
			String err="ht[\""+key+"\"]=\""+val+
				"\", expected \""+cache[i+max]+"\"";
			Assert(err,val!=null && val.Equals(cache[i+max]));
		}
		
		int r1=(n/3);
		int r2=r1+(n/5);
		
		for (int i=r1;i<r2;i++) {
			ht.Remove(cache[i]);
		}
		
		
		for (int i=0;i<n;i++) {
			if (i>=r1 && i<r2) {
				Assert(ht[cache[i]]==null);
			} else {
				String key=cache[i];
				String val=ht[key] as String;
				String err="ht[\""+key+"\"]=\""+val+
					"\", expected \""+cache[i+max]+"\"";
				Assert(err,val!=null && val.Equals(cache[i+max]));
			}
		}
		
		ICollection keys=ht.Keys;
		int nKeys=0;
		foreach (Object key in keys) {
			Assert((key as String) != null);
			nKeys++;
		}
		Assert(nKeys==ht.Count);

		
		ICollection vals=ht.Values;
		int nVals=0;
		foreach (Object val in vals) {
			Assert((val as String) != null);
			nVals++;
		}
		Assert(nVals==ht.Count);
		
	}

	
	/// <summary>
	///  Test hashtable with CaseInsensitiveHashCodeProvider
	///  and CaseInsensitive comparer.
	/// </summary>
        [Test]        
	public void TestCaseInsensitive ()
	{
		// Not very meaningfull test, just to make
		// sure that hcp is set properly set.
		Hashtable ciHashtable = new Hashtable(11,1.0f,CaseInsensitiveHashCodeProvider.Default,CaseInsensitiveComparer.Default);
		ciHashtable ["key1"] = "value";
		ciHashtable ["key2"] = "VALUE";
		Assert(ciHashtable ["key1"].Equals ("value"));
		Assert(ciHashtable ["key2"].Equals ("VALUE"));

		ciHashtable ["KEY1"] = "new_value";
		Assert(ciHashtable ["key1"].Equals ("new_value"));

	}

        [Test]
	public void TestCopyConstructor ()
	{
		SetDefaultData ();

		Hashtable htCopy = new Hashtable (ht);

		Assert(ht.Count == htCopy.Count);
	}

        [Test]
	public void TestEnumerator ()
	{
		SetDefaultData ();

		IEnumerator e = ht.GetEnumerator ();

		while (e.MoveNext ()) {}

		Assert (!e.MoveNext ());

	}
}
}