[refactoring] version testing

internal/version/version.go

@@ -42,17 +42,17 @@ func Compare(a string, b string) (int, error) {
 }
 
 func parse(v string) (version, error) {
-	parts := strings.Split(v, ".")
-	if len(parts) != 2 {
+	i := strings.Index(v, ".")
+	if i == -1 {
 		return version{}, errors.New("version must contain major and minor parts")
 	}
 
-	major, err := strconv.Atoi(parts[0])
+	major, err := strconv.Atoi(v[:i])
 	if err != nil {
 		return version{}, err
 	}
 
-	minor, err := strconv.Atoi(parts[1])
+	minor, err := strconv.Atoi(v[i+1:])
 	if err != nil {
 		return version{}, err
 	}

internal/version/version_test.go

@@ -0,0 +1,29 @@
+package version_test
+
+import (
+	"gotest.tools/assert"
+	"testing"
+
+	"github.com/z7zmey/php-parser/internal/version"
+)
+
+func TestSmaller(t *testing.T) {
+	r, err := version.Compare("7.3", "5.6")
+
+	assert.NilError(t, err)
+	assert.Equal(t, 1, r)
+}
+
+func TestGreater(t *testing.T) {
+	r, err := version.Compare("5.6", "7.3")
+
+	assert.NilError(t, err)
+	assert.Equal(t, -1, r)
+}
+
+func TestEqual(t *testing.T) {
+	r, err := version.Compare("7.3", "7.3")
+
+	assert.NilError(t, err)
+	assert.Equal(t, 0, r)
+}