[add] tests, [add] refactor epub feat

metadata/metadata_test.go

@@ -0,0 +1,14 @@
+package metadata
+
+import (
+	"testing"
+)
+
+func TestGetWordCount(t *testing.T) {
+	var want int64 = 30477
+	wordCount, err := countEPUBWords("./_test_files/alice.epub")
+
+	if wordCount != want {
+		t.Fatalf(`Expected: %v, Got: %v, Error: %v`, want, wordCount, err)
+	}
+}