initial checkin

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

either/apply_test.go

@@ -0,0 +1,48 @@
+package either
+
+import (
+	"testing"
+
+	M "github.com/ibm/fp-go/monoid/testing"
+	N "github.com/ibm/fp-go/number"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestApplySemigroup(t *testing.T) {
+
+	sg := ApplySemigroup[string](N.SemigroupSum[int]())
+
+	la := Left[string, int]("a")
+	lb := Left[string, int]("b")
+	r1 := Right[string](1)
+	r2 := Right[string](2)
+	r3 := Right[string](3)
+
+	assert.Equal(t, la, sg.Concat(la, lb))
+	assert.Equal(t, lb, sg.Concat(r1, lb))
+	assert.Equal(t, la, sg.Concat(la, r2))
+	assert.Equal(t, lb, sg.Concat(r1, lb))
+	assert.Equal(t, r3, sg.Concat(r1, r2))
+}
+
+func TestApplicativeMonoid(t *testing.T) {
+
+	m := ApplicativeMonoid[string](N.MonoidSum[int]())
+
+	la := Left[string, int]("a")
+	lb := Left[string, int]("b")
+	r1 := Right[string](1)
+	r2 := Right[string](2)
+	r3 := Right[string](3)
+
+	assert.Equal(t, la, m.Concat(la, m.Empty()))
+	assert.Equal(t, lb, m.Concat(m.Empty(), lb))
+	assert.Equal(t, r1, m.Concat(r1, m.Empty()))
+	assert.Equal(t, r2, m.Concat(m.Empty(), r2))
+	assert.Equal(t, r3, m.Concat(r1, r2))
+}
+
+func TestApplicativeMonoidLaws(t *testing.T) {
+	m := ApplicativeMonoid[string](N.MonoidSum[int]())
+	M.AssertLaws(t, m)([]Either[string, int]{Left[string, int]("a"), Right[string](1)})
+}