1 files changed, 88 insertions, 0 deletions
diff --git a/parse_test.go b/parse_test.go
new file mode 100644
index 0000000..4864ebc
--- /dev/null
+++ b/parse_test.go
@@ -0,0 +1,88 @@
+package arguments
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func split(s string) []string {
+	return strings.Split(s, " ")
+}
+
+func TestStringSingle(t *testing.T) {
+	var args struct {
+		Foo string
+	}
+	err := ParseFrom(&args, split("--foo bar"))
+	require.NoError(t, err)
+	assert.Equal(t, "bar", args.Foo)
+}
+
+func TestMixed(t *testing.T) {
+	var args struct {
+		Foo  string `arg:"-f"`
+		Bar  int
+		Ham  bool
+		Spam float32
+	}
+	args.Bar = 3
+	err := ParseFrom(&args, split("-spam=1.2 -ham -f xyz"))
+	require.NoError(t, err)
+	assert.Equal(t, "xyz", args.Foo)
+	assert.Equal(t, 3, args.Bar)
+	assert.Equal(t, true, args.Ham)
+	assert.Equal(t, 1.2, args.Spam)
+}
+
+func TestRequired(t *testing.T) {
+	var args struct {
+		Foo string `arg:"required"`
+	}
+	err := ParseFrom(&args, nil)
+	require.Error(t, err, "--foo is required")
+}
+
+func TestShortFlag(t *testing.T) {
+	var args struct {
+		Foo string `arg:"-f"`
+	}
+
+	err := ParseFrom(&args, split("-f xyz"))
+	require.NoError(t, err)
+	assert.Equal(t, "xyz", args.Foo)
+
+	err = ParseFrom(&args, split("-foo xyz"))
+	require.NoError(t, err)
+	assert.Equal(t, "xyz", args.Foo)
+
+	err = ParseFrom(&args, split("--foo xyz"))
+	require.NoError(t, err)
+	assert.Equal(t, "xyz", args.Foo)
+}
+
+func TestCaseSensitive(t *testing.T) {
+	var args struct {
+		Lower bool `arg:"-v"`
+		Upper bool `arg:"-V"`
+	}
+
+	err := ParseFrom(&args, split("-v"))
+	require.NoError(t, err)
+	assert.True(t, args.Lower)
+	assert.False(t, args.Upper)
+}
+
+func TestCaseSensitive2(t *testing.T) {
+	var args struct {
+		Lower bool `arg:"-v"`
+		Upper bool `arg:"-V"`
+	}
+
+	err := ParseFrom(&args, split("-V"))
+	require.NoError(t, err)
+	assert.False(t, args.Lower)
+	assert.True(t, args.Upper)
+}