diff --git a/Tests/geometrizeTests/BitmapTests.swift b/Tests/geometrizeTests/BitmapTests.swift
index 1663a86..3d2c584 100644
--- a/Tests/geometrizeTests/BitmapTests.swift
+++ b/Tests/geometrizeTests/BitmapTests.swift
@@ -549,6 +549,64 @@ final class BitmapTests: XCTestCase {
         )
     }
 
+    func testDifferenceFull() throws {
+        let blackBitmap = Bitmap(width: 10, height: 10, color: .black)
+
+        // Difference with itself is 0
+        XCTAssertEqual(blackBitmap.differenceFull(with: blackBitmap), 0)
+
+        var blackBitmapOnePixelChanged = blackBitmap
+        blackBitmapOnePixelChanged[0, 0] = .white
+        var blackBitmapTwoPixelsChanged = blackBitmapOnePixelChanged
+        blackBitmapTwoPixelsChanged[0, 1] = .white
+
+        // Changing two pixels means there's more difference than changing one.
+        XCTAssertGreaterThan(
+            blackBitmap.differenceFull(with: blackBitmapTwoPixelsChanged),
+            blackBitmap.differenceFull(with: blackBitmapOnePixelChanged)
+        )
+
+        // Now the same for white image
+        let whiteBitmap = Bitmap(width: 10, height: 10, color: .white)
+
+        // Difference with itself is 0
+        XCTAssertEqual(whiteBitmap.differenceFull(with: whiteBitmap), 0)
+
+        var whiteBitmapOnePixelChanged = whiteBitmap
+        whiteBitmapOnePixelChanged[0, 0] = .black
+        var whiteBitmapTwoPixelsChanged = whiteBitmapOnePixelChanged
+        whiteBitmapTwoPixelsChanged[0, 1] = .black
+
+        // Changing two pixels means there's more difference than changing one.
+        XCTAssertGreaterThan(
+            whiteBitmap.differenceFull(with: whiteBitmapTwoPixelsChanged),
+            whiteBitmap.differenceFull(with: whiteBitmapOnePixelChanged)
+        )
+    }
+
+    func testDifferenceFullComparingResultWithCPlusPlus() throws {
+        let bitmapFirst = try Bitmap(ppmBundleResource: "differenceFull bitmap first", withExtension: "ppm")
+        let bitmapSecond = try Bitmap(ppmBundleResource: "differenceFull bitmap second", withExtension: "ppm")
+        XCTAssertEqual(bitmapFirst.differenceFull(with: bitmapSecond), 0.170819, accuracy: 0.000001)
+    }
+
+    func testDifferencePartialComparingResultWithCPlusPlus() throws {
+        let bitmapTarget = try Bitmap(ppmBundleResource: "differencePartial bitmap target", withExtension: "ppm")
+        let bitmapBefore = try Bitmap(ppmBundleResource: "differencePartial bitmap before", withExtension: "ppm")
+        let bitmapAfter = try Bitmap(ppmBundleResource: "differencePartial bitmap after", withExtension: "ppm")
+        let scanlines = try [Scanline](stringBundleResource: "differencePartial scanlines", withExtension: "txt")
+        XCTAssertEqual(
+            bitmapBefore.differencePartial(
+                with: bitmapAfter,
+                target: bitmapTarget,
+                score: 0.170819,
+                mask: scanlines
+            ),
+            0.170800,
+            accuracy: 0.000001
+        )
+    }
+
 }
 
 // swiftlint:disable:this file_length
diff --git a/Tests/geometrizeTests/CoreTests.swift b/Tests/geometrizeTests/CoreTests.swift
index e250155..5fcd0e6 100644
--- a/Tests/geometrizeTests/CoreTests.swift
+++ b/Tests/geometrizeTests/CoreTests.swift
@@ -3,64 +3,6 @@ import XCTest
 
 final class CoreTests: XCTestCase {
 
-    func testDifferenceFull() throws {
-        let blackBitmap = Bitmap(width: 10, height: 10, color: .black)
-
-        // Difference with itself is 0
-        XCTAssertEqual(blackBitmap.differenceFull(with: blackBitmap), 0)
-
-        var blackBitmapOnePixelChanged = blackBitmap
-        blackBitmapOnePixelChanged[0, 0] = .white
-        var blackBitmapTwoPixelsChanged = blackBitmapOnePixelChanged
-        blackBitmapTwoPixelsChanged[0, 1] = .white
-
-        // Changing two pixels means there's more difference than changing one.
-        XCTAssertGreaterThan(
-            blackBitmap.differenceFull(with: blackBitmapTwoPixelsChanged),
-            blackBitmap.differenceFull(with: blackBitmapOnePixelChanged)
-        )
-
-        // Now the same for white image
-        let whiteBitmap = Bitmap(width: 10, height: 10, color: .white)
-
-        // Difference with itself is 0
-        XCTAssertEqual(whiteBitmap.differenceFull(with: whiteBitmap), 0)
-
-        var whiteBitmapOnePixelChanged = whiteBitmap
-        whiteBitmapOnePixelChanged[0, 0] = .black
-        var whiteBitmapTwoPixelsChanged = whiteBitmapOnePixelChanged
-        whiteBitmapTwoPixelsChanged[0, 1] = .black
-
-        // Changing two pixels means there's more difference than changing one.
-        XCTAssertGreaterThan(
-            whiteBitmap.differenceFull(with: whiteBitmapTwoPixelsChanged),
-            whiteBitmap.differenceFull(with: whiteBitmapOnePixelChanged)
-        )
-    }
-
-    func testDifferenceFullComparingResultWithCPlusPlus() throws {
-        let bitmapFirst = try Bitmap(ppmBundleResource: "differenceFull bitmap first", withExtension: "ppm")
-        let bitmapSecond = try Bitmap(ppmBundleResource: "differenceFull bitmap second", withExtension: "ppm")
-        XCTAssertEqual(bitmapFirst.differenceFull(with: bitmapSecond), 0.170819, accuracy: 0.000001)
-    }
-
-    func testDifferencePartialComparingResultWithCPlusPlus() throws {
-        let bitmapTarget = try Bitmap(ppmBundleResource: "differencePartial bitmap target", withExtension: "ppm")
-        let bitmapBefore = try Bitmap(ppmBundleResource: "differencePartial bitmap before", withExtension: "ppm")
-        let bitmapAfter = try Bitmap(ppmBundleResource: "differencePartial bitmap after", withExtension: "ppm")
-        let scanlines = try [Scanline](stringBundleResource: "differencePartial scanlines", withExtension: "txt")
-        XCTAssertEqual(
-            bitmapBefore.differencePartial(
-                with: bitmapAfter,
-                target: bitmapTarget,
-                score: 0.170819,
-                mask: scanlines
-            ),
-            0.170800,
-            accuracy: 0.000001
-        )
-    }
-
     func testDefaultEnergyFunctionComparingResultWithCPlusPlus() throws {
         let scanlines = try [Scanline](
             stringBundleResource: "defaultEnergyFunction scanlines",