Add tests

Manifest.toml

@@ -2,7 +2,7 @@
 
 julia_version = "1.9.3"
 manifest_format = "2.0"
-project_hash = "e0c77beb18dc1f6cce661ebd60658c0c1a77390f"
+project_hash = "cde703bfa3f648aa63354f4e861d6be54804f556"
 
 [[deps.ANSIColoredPrinters]]
 git-tree-sha1 = "574baf8110975760d391c710b6341da1afa48d8c"

Project.toml

@@ -5,3 +5,4 @@ version = "0.1.0"
 
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

test/runtests.jl

+include("test_add.jl")

test/test_add.jl

+using SustainableSoftwareEngineering
+using Test
+
+@testset "Addition Tests" begin
+    @test add(2, 2) == 4
+    @test add(-1, 1) == 0
+    @test add(0, 0) == 0
+    @test_throws MethodError add("a", "b")
+end