update book code

eBook/exercises/chapter_13/string_reverse_test.go

@@ -0,0 +1,40 @@
+// string_reverse_test.go
+package strev
+
+import "testing"
+import "./strev"
+
+type ReverseTest struct {
+	in, out 	string
+}
+
+var ReverseTests = []ReverseTest {
+	ReverseTest{"ABCD", "DCBA"},
+	ReverseTest{"CVO-AZ", "ZA-OVC"},
+	ReverseTest{"Hello 世界", "界世 olleH"},
+}
+
+func TestReverse(t *testing.T) {
+/*
+	in := "CVO-AZ"
+	out := Reverse(in)
+	exp := "ZA-OVC"
+	if out != exp {
+		t.Errorf("Reverse of %s expects %s, but got %s", in, exp, out)
+	}
+*/
+// testing with a battery of testdata:
+	for _, r := range ReverseTests {
+		exp := strev.Reverse(r.in)
+		if r.out != exp {
+			t.Errorf("Reverse of %s expects %s, but got %s", r.in, exp, r.out)
+		}
+	}
+}
+
+func BenchmarkReverse(b *testing.B) {
+	s := "ABCD"
+	for i:=0; i < b.N; i++ {
+		strev.Reverse(s)
+	}
+}