test: restructure test packages

Signed-off-by: Steffen Vogel <post@steffenvogel.de>

test/test_test.go

@@ -0,0 +1,46 @@
+package test_test
+
+import (
+	"crypto/rand"
+	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"riasc.eu/wice/test"
+)
+
+func TestSuite(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Test Helper Suite")
+}
+
+var _ = test.SetupLogging()
+
+var _ = Describe("entropy", func() {
+	Specify("that the entropy of an empty slice is zero", func() {
+		Expect(test.Entropy([]byte{})).To(BeNumerically("==", 0))
+		Expect(test.Entropy(nil)).To(BeNumerically("==", 0))
+	})
+
+	Specify("that the entropy of A is defined as", func() {
+		Expect(test.Entropy([]byte("AAAAAAAAAAAAAA"))).To(BeZero())
+	})
+
+	Specify("that the entropy of A is defined as", func() {
+		Expect(test.Entropy([]byte("This is some not-so random string"))).To(
+			And(
+				BeNumerically(">", 1),
+				BeNumerically("<", 5),
+			),
+		)
+	})
+
+	Specify("that the entropy of random data", func() {
+		random := make([]byte, 128)
+		n, err := rand.Read(random)
+		Expect(err).To(Succeed())
+		Expect(n).To(Equal(128))
+
+		Expect(test.Entropy(random)).To(BeNumerically(">", 5))
+	})
+})