From af801d86e84ab2e4fca588f684af46c9e505964b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tau=20G=C3=A4rtli?= <git@tau.garden>
Date: Fri, 24 Jan 2025 13:41:14 +0100
Subject: [PATCH] Add unit test for Apply

---
 Funcky.Test/FunctionalClass/ApplyTest.cs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Funcky.Test/FunctionalClass/ApplyTest.cs

diff --git a/Funcky.Test/FunctionalClass/ApplyTest.cs b/Funcky.Test/FunctionalClass/ApplyTest.cs
new file mode 100644
index 00000000..6aae2e35
--- /dev/null
+++ b/Funcky.Test/FunctionalClass/ApplyTest.cs
@@ -0,0 +1,23 @@
+using static Funcky.Discard;
+
+namespace Funcky.Test.FunctionalClass;
+
+public class ApplyTest
+{
+    [Fact]
+    public void CanApplyParametersInAnyOrder()
+    {
+        var func = Linear0;
+        var f1 = Fn(Linear0).Apply(__, __, 10);
+        var f2 = func.Apply(2, __, 7);
+        var f3 = Apply(Fn(Linear0), 42, __, __);
+        Assert.Equal(Linear0(10, 2, 10), f1(10, 2));
+        Assert.Equal(Linear0(2, 10, 7), f2(10));
+        Assert.Equal(Linear0(42, 10, 2), f3(10, 2));
+    }
+
+    public static T Fn<T>(T value) => value;
+
+    private static int Linear0(int a, int b, int c)
+        => a + (b * c);
+}