Add words package and its test

Author: lfcd85

kadai3-1/lfcd85/Makefile

@@ -1,4 +1,4 @@
-build: cmd/*.go typinggame/*.go
+build: cmd/*.go typinggame/*.go words/*.go
 	GO111MODULE=on go build -o bin/typinggame cmd/main.go
 
 fmt:

kadai3-1/lfcd85/go.mod

@@ -1,3 +1,5 @@
 module github.com/gopherdojo/dojo5/kadai3-1/lfcd85
 
 go 1.12
+
+require github.com/hashicorp/go-multierror v1.0.0

kadai3-1/lfcd85/go.sum

@@ -0,0 +1,4 @@
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v1.0.0 h1:iVjPR7a6H0tWELX5NxNe7bYopibicUzc7uPribsnS6o=
+github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHhCYQXV3UM06sGGrk=

kadai3-1/lfcd85/testdata/abc.txt

@@ -0,0 +1,3 @@
+a
+b
+c

kadai3-1/lfcd85/words/words.go

@@ -0,0 +1,34 @@
+package words
+
+import (
+	"bufio"
+	"os"
+
+	"github.com/gopherdojo/dojo5/kadai3-1/lfcd85/typinggame"
+	"github.com/hashicorp/go-multierror"
+)
+
+func Import(path string) (typinggame.Words, error) {
+	var words typinggame.Words
+	var result error
+
+	f, err := os.Open(path)
+	if err != nil {
+		result = multierror.Append(result, err)
+	}
+	defer func() {
+		if err := f.Close(); err != nil {
+			result = multierror.Append(result, err)
+		}
+	}()
+
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		words = append(words, s.Text())
+	}
+	if err := s.Err(); err != nil {
+		result = multierror.Append(result, err)
+	}
+
+	return words, result
+}

kadai3-1/lfcd85/words/words_test.go

@@ -0,0 +1,40 @@
+package words_test
+
+import (
+	"testing"
+
+	"github.com/gopherdojo/dojo5/kadai3-1/lfcd85/words"
+)
+
+func TestImport(t *testing.T) {
+	cases := []struct {
+		path      string
+		firstWord string
+		lastWord  string
+		length    int
+	}{
+		{"../testdata/abc.txt", "a", "c", 3},
+		{"../testdata/go_standard_library.txt", "archive", "unsafe", 154},
+	}
+
+	for _, c := range cases {
+		c := c
+		t.Run(c.path, func(t *testing.T) {
+			t.Parallel()
+
+			words, err := words.Import(c.path)
+			if err != nil {
+				t.Errorf("failed to Import %v: %v", c.path, err)
+			}
+			if words[0] != c.firstWord {
+				t.Errorf("the first item of imported words is %v; it should be %v", words[0], c.firstWord)
+			}
+			if words[len(words)-1] != c.lastWord {
+				t.Errorf("the first item of imported words is %v; it should be %v", words[0], c.lastWord)
+			}
+			if len(words) != c.length {
+				t.Errorf("the length of imported words is %v; it should be %v", len(words), c.length)
+			}
+		})
+	}
+}