Function TestSpec_PublicAPI_MergeUnique

pkg/sliceutil/spec_test.go:173–199

TestSpec_PublicAPI_MergeUnique validates the documented behavior of MergeUnique as described in the sliceutil README.md specification. Specification: "Returns a deduplicated slice starting with base and appending unseen values from extra" README example: merged := sliceutil.MergeUnique([]string{

(t *testing.T)

//	merged := sliceutil.MergeUnique([]string{"a", "b"}, "b", "c")
//	// merged = ["a", "b", "c"]
func TestSpec_PublicAPI_MergeUnique(t *testing.T) {
	t.Run("appends unseen values from extra to base", func(t *testing.T) {
		merged := MergeUnique([]string{"a", "b"}, "b", "c")
		assert.Equal(t, []string{"a", "b", "c"}, merged,
			"MergeUnique should append only unseen extras, in order")
	})

	t.Run("base is deduplicated when it contains duplicates", func(t *testing.T) {
		merged := MergeUnique([]string{"a", "b", "a"}, "c")
		assert.Equal(t, []string{"a", "b", "c"}, merged,
			"MergeUnique should deduplicate the base slice")
	})

	t.Run("returns base when extra is empty", func(t *testing.T) {
		merged := MergeUnique([]string{"x", "y"})
		assert.Equal(t, []string{"x", "y"}, merged,
			"MergeUnique with no extras should yield the deduplicated base")
	})

	t.Run("does not modify input base slice", func(t *testing.T) {
		original := []string{"a", "b"}
		input := make([]string, len(original))
		copy(input, original)
		_ = MergeUnique(input, "b", "c")
		assert.Equal(t, original, input, "MergeUnique must not modify the input base slice")
	})
}

// TestSpec_PublicAPI_Exclude validates the documented behavior of
// Exclude as described in the sliceutil README.md specification.