Add Options.validate test

Author: tanaka0325

kadai2/tanaka0325/imgconv/imgconv_test.go

@@ -0,0 +1,56 @@
+package imgconv
+
+import (
+	"testing"
+)
+
+func TestOption_validate(t *testing.T) {
+	notAllowdExt := "not_allowed_ext"
+	jpg := "jpg"
+	png := "png"
+	allowedList := []string{jpg, png}
+
+	tests := []struct {
+		name    string
+		options Options
+		args    []string
+		isErr   bool
+	}{
+		{
+			name: "err: Options.From is not allowed",
+			options: Options{
+				From: &notAllowdExt,
+				To:   &png,
+			},
+			args:  allowedList,
+			isErr: true,
+		},
+		{
+			name: "err: Options.To is not allowed",
+			options: Options{
+				From: &jpg,
+				To:   &notAllowdExt,
+			},
+			args:  allowedList,
+			isErr: true,
+		},
+		{
+			name: "ok",
+			options: Options{
+				From: &jpg,
+				To:   &png,
+			},
+			args:  allowedList,
+			isErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.options.validate(tt.args)
+			if (tt.isErr && err == nil) || (!tt.isErr && err != nil) {
+				t.Errorf("expect err is %t, but got err is %s", tt.isErr, err)
+			}
+		})
+	}
+}