Some solutions for the julia path

julia/secrets/runtests.jl

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+using Test
+
+include("secrets.jl")
+
+@testset verbose = true "tests" begin
+    
+    @testset "1. Shift back the bits" begin
+        @test shift_back(8, 2) == 2
+
+        # The original Java code uses a signed integer, so we use Int32 here
+        # Fails with Int64!
+        @test shift_back(Int32(-2_144_333_657), 3) == 268_829_204
+    end
+
+    @testset "2. Set bits" begin
+        @test set_bits(5, 3) == 7
+        @test set_bits(5_652, 26_150) == 30_262
+    end
+
+    @testset "3. Flip bits" begin
+        @test flip_bits(5, 11) == 14
+        @test flip_bits(38_460, 15_471) == 43_603
+    end
+
+    @testset "4. Clear bits" begin
+        @test clear_bits(5, 11) == 4
+        @test clear_bits(90, 240) == 10
+    end
+
+end