added a few more tests

Tests/CollectionTests.cs

@@ -0,0 +1,31 @@
+using MLEM.Extensions;
+using NUnit.Framework;
+
+namespace Tests {
+    public class CollectionTests {
+
+        [Test]
+        public void TestCombinations() {
+            var things = new[] {
+                new[] {'1', '2', '3'},
+                new[] {'A', 'B'},
+                new[] {'+', '-'}
+            };
+            
+            var expected = new[] {
+                new[] {'1', 'A', '+'}, new[] {'1', 'A', '-'}, new[] {'1', 'B', '+'}, new[] {'1', 'B', '-'},
+                new[] {'2', 'A', '+'}, new[] {'2', 'A', '-'}, new[] {'2', 'B', '+'}, new[] {'2', 'B', '-'},
+                new[] {'3', 'A', '+'}, new[] {'3', 'A', '-'}, new[] {'3', 'B', '+'}, new[] {'3', 'B', '-'}
+            };
+            Assert.AreEqual(things.Combinations(), expected);
+            
+            var indices = new[] {
+                new[] {0, 0, 0}, new[] {0, 0, 1}, new[] {0, 1, 0}, new[] {0, 1, 1},
+                new[] {1, 0, 0}, new[] {1, 0, 1}, new[] {1, 1, 0}, new[] {1, 1, 1},
+                new[] {2, 0, 0}, new[] {2, 0, 1}, new[] {2, 1, 0}, new[] {2, 1, 1}
+            };
+            Assert.AreEqual(things.IndexCombinations(), indices);
+        }
+
+    }
+}

Tests/DataTests.cs

@@ -0,0 +1,77 @@
+using System;
+using System.IO;
+using Microsoft.Xna.Framework;
+using MLEM.Data;
+using MLEM.Data.Json;
+using MLEM.Misc;
+using Newtonsoft.Json;
+using NUnit.Framework;
+
+namespace Tests {
+    public class DataTests {
+
+        private readonly TestObject testObject = new TestObject(Vector2.One, "test") {
+            Vec = new Vector2(10, 20),
+            Point = new Point(20, 30),
+            Dir = Direction2.Left,
+            OtherTest = new TestObject(Vector2.One, "other") {
+                Vec = new Vector2(70, 30),
+                Dir = Direction2.Right
+            }
+        };
+
+        [Test]
+        public void TestJsonSerializers() {
+            var serializer = JsonConverters.AddAll(new JsonSerializer());
+
+            var writer = new StringWriter();
+            serializer.Serialize(writer, this.testObject);
+            var ret = writer.ToString();
+
+            Assert.AreEqual(ret, "{\"Vec\":\"10 20\",\"Point\":\"20 30\",\"OtherTest\":{\"Vec\":\"70 30\",\"Point\":\"0 0\",\"OtherTest\":null,\"Dir\":\"Right\"},\"Dir\":\"Left\"}");
+
+            var read = serializer.Deserialize<TestObject>(new JsonTextReader(new StringReader(ret)));
+            Assert.AreEqual(this.testObject, read);
+        }
+
+        [Test]
+        public void TestCopy() {
+            var copy = this.testObject.Copy();
+            Assert.AreEqual(this.testObject, copy);
+            Assert.AreSame(this.testObject.OtherTest, copy.OtherTest);
+
+            var deepCopy = this.testObject.DeepCopy();
+            Assert.AreEqual(this.testObject, deepCopy);
+            Assert.AreNotSame(this.testObject.OtherTest, deepCopy.OtherTest);
+        }
+
+        private class TestObject {
+
+            public Vector2 Vec;
+            public Point Point;
+            public Direction2 Dir { get; set; }
+            public TestObject OtherTest;
+
+            public TestObject(Vector2 test, string test2) {
+            }
+
+            public override string ToString() {
+                return $"{nameof(this.Vec)}: {this.Vec}, {nameof(this.Point)}: {this.Point}, {nameof(this.OtherTest)}: {this.OtherTest}, {nameof(this.Dir)}: {this.Dir}";
+            }
+
+            protected bool Equals(TestObject other) {
+                return this.Vec.Equals(other.Vec) && this.Point.Equals(other.Point) && Equals(this.OtherTest, other.OtherTest) && this.Dir == other.Dir;
+            }
+
+            public override bool Equals(object obj) {
+                return ReferenceEquals(this, obj) || obj is TestObject other && Equals(other);
+            }
+
+            public override int GetHashCode() {
+                return HashCode.Combine(this.Vec, this.Point, this.OtherTest, (int) this.Dir);
+            }
+
+        }
+
+    }
+}

Tests/DirectionTests.cs

@@ -0,0 +1,24 @@
+using System.Drawing;
+using Microsoft.Xna.Framework;
+using MLEM.Misc;
+using NUnit.Framework;
+
+namespace Tests {
+    public class DirectionTests {
+
+        [Test]
+        public void TestDirections() {
+            Assert.AreEqual(new Vector2(0.5F, 0.5F).ToDirection(), Direction2.DownRight);
+            Assert.AreEqual(new Vector2(0.25F, 0.5F).ToDirection(), Direction2.DownRight);
+            Assert.AreEqual(new Vector2(0.15F, 0.5F).ToDirection(), Direction2.Down);
+        }
+
+        [Test]
+        public void Test90Directions() {
+            Assert.AreEqual(new Vector2(0.75F, 0.5F).To90Direction(), Direction2.Right);
+            Assert.AreEqual(new Vector2(0.5F, 0.5F).To90Direction(), Direction2.Down);
+            Assert.AreEqual(new Vector2(0.25F, 0.5F).To90Direction(), Direction2.Down);
+        }
+
+    }
+}

Tests/NumberTests.cs

@@ -1,5 +1,6 @@
 using Microsoft.Xna.Framework;
 using MLEM.Extensions;
+using MLEM.Misc;
 using NUnit.Framework;
 
 namespace Tests {
@@ -23,13 +24,40 @@ namespace Tests {
         public void TestEquals() {
             Assert.IsTrue(0.25F.Equals(0.26F, 0.01F));
             Assert.IsFalse(0.25F.Equals(0.26F, 0.009F));
+
+            Assert.IsTrue(new Vector2(0.25F, 0).Equals(new Vector2(0.3F, 0), 0.1F));
+            Assert.IsFalse(new Vector2(0.25F, 0.5F).Equals(new Vector2(0.3F, 0.25F), 0.1F));
+
+            Assert.IsTrue(new Vector3(0.25F, 0, 3.5F).Equals(new Vector3(0.3F, 0, 3.45F), 0.1F));
+            Assert.IsFalse(new Vector3(0.25F, 0.5F, 0).Equals(new Vector3(0.3F, 0.25F, 0), 0.1F));
+
+            Assert.IsTrue(new Vector4(0.25F, 0, 3.5F, 0.75F).Equals(new Vector4(0.3F, 0, 3.45F, 0.7F), 0.1F));
+            Assert.IsFalse(new Vector4(0.25F, 0.5F, 0, 1).Equals(new Vector4(0.3F, 0.25F, 0, 0.9F), 0.1F));
         }
 
         [Test]
-        public void TestMatrixOps() {
-            var matrix = Matrix.CreateRotationX(2) * Matrix.CreateScale(2.5F);
-            Assert.AreEqual(matrix.Scale(), new Vector3(2.5F));
-            Assert.AreEqual(matrix.Rotation(), Quaternion.CreateFromAxisAngle(Vector3.UnitX, 2));
+        public void TestPointExtensions() {
+            Assert.AreEqual(new Point(4, 3).Multiply(3), new Point(12, 9));
+            Assert.AreEqual(new Point(17, 12).Divide(3), new Point(5, 4));
+            Assert.AreEqual(new Point(4, 12).Transform(Matrix.CreateTranslation(2, 0, 0) * Matrix.CreateScale(2, 2, 2)), new Point(12, 24));
+        }
+
+        [Test]
+        public void TestMatrixOps([Range(0.5F, 2, 0.5F)] float scale, [Range(-1, 1, 1F)] float rotationX) {
+            var matrix = Matrix.CreateRotationX(rotationX) * Matrix.CreateScale(scale, scale, scale);
+            Assert.IsTrue(matrix.Scale().Equals(new Vector3(scale), 0.001F), $"{matrix.Scale()} does not equal {new Vector2(scale)}");
+            Assert.AreEqual(matrix.Rotation(), Quaternion.CreateFromAxisAngle(Vector3.UnitX, rotationX));
+        }
+
+        [Test]
+        public void TestPenetrate() {
+            new RectangleF(2, 2, 4, 4).Penetrate(new RectangleF(3, 2, 4, 4), out var normal, out var penetration);
+            Assert.AreEqual(normal, new Vector2(1, 0));
+            Assert.AreEqual(penetration, 3);
+
+            new RectangleF(-10, 10, 5, 5).Penetrate(new RectangleF(25, 25, 10, 10), out normal, out penetration);
+            Assert.AreEqual(normal, Vector2.Zero);
+            Assert.AreEqual(penetration, 0);
         }
 
     }