Rename transformEquals to equals(as3DTransform:)

Author: markuswntr

Sources/QuaternionModule/Quaternion.swift

@@ -421,7 +421,7 @@ extension Quaternion: Hashable {
   /// - Parameter other: The value to compare.
   /// - Returns: True if the transformation of this quaternion equals `other`.
   @_transparent
-  public func transformEquals(_ other: Quaternion) -> Bool {
+  public func equals(as3DTransform other: Quaternion) -> Bool {
     // Identify all numbers with either component non-finite as a single "point at infinity".
     guard isFinite || other.isFinite else { return true }
     // For finite numbers, equality is defined componentwise. Cases where only

Tests/QuaternionTests/PropertyTests.swift

@@ -165,7 +165,26 @@ final class PropertyTests: XCTestCase {
       ),
     ]
     for (lhs, rhs) in rotations {
-      XCTAssertTrue(lhs.transformEquals(rhs))
+      XCTAssertTrue(lhs.equals(as3DTransform: rhs))
+    }
+
+    let signDifferentAxis: [(lhs: Quaternion<T>, rhs: Quaternion<T>)] = [
+      (
+        Quaternion<T>(real:  -.pi, imaginary:  -.pi,  -.pi,  -.pi),
+        Quaternion<T>(real:  -.pi, imaginary:   .pi,   .pi,   .pi)
+      ), (
+        Quaternion<T>(real:  -.ulpOfOne, imaginary:   .ulpOfOne,   .ulpOfOne,   .ulpOfOne),
+        Quaternion<T>(real:  -.ulpOfOne, imaginary:  -.ulpOfOne,  -.ulpOfOne,  -.ulpOfOne)
+      ), (
+        Quaternion<T>(real:  -.pi, imaginary:  -.pi,   .pi,  -.pi),
+        Quaternion<T>(real:  -.pi, imaginary:   .pi,  -.pi,   .pi)
+      ), (
+        Quaternion<T>(real:  -.ulpOfOne, imaginary:  -.ulpOfOne,   .ulpOfOne,   .ulpOfOne),
+        Quaternion<T>(real:  -.ulpOfOne, imaginary:   .ulpOfOne,  -.ulpOfOne,  -.ulpOfOne)
+      )
+    ]
+    for (lhs, rhs) in signDifferentAxis {
+      XCTAssertFalse(lhs.equals(as3DTransform: rhs))
     }
   }