feat: add GitVersion struct

pkg/commands/git_commands/version_test.go

@@ -0,0 +1,47 @@
+package git_commands
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseGitVersion(t *testing.T) {
+	scenarios := []struct {
+		input    string
+		expected GitVersion
+	}{
+		{
+			input:    "git version 2.39.0",
+			expected: GitVersion{Major: 2, Minor: 39, Patch: 0, Additional: ""},
+		},
+		{
+			input:    "git version 2.37.1 (Apple Git-137.1)",
+			expected: GitVersion{Major: 2, Minor: 37, Patch: 1, Additional: "(Apple Git-137.1)"},
+		},
+		{
+			input:    "git version 2.37 (Apple Git-137.1)",
+			expected: GitVersion{Major: 2, Minor: 37, Patch: 0, Additional: "(Apple Git-137.1)"},
+		},
+	}
+
+	for _, s := range scenarios {
+		actual, err := ParseGitVersion(s.input)
+
+		assert.NoError(t, err)
+		assert.NotNil(t, actual)
+		assert.Equal(t, s.expected.Major, actual.Major)
+		assert.Equal(t, s.expected.Minor, actual.Minor)
+		assert.Equal(t, s.expected.Patch, actual.Patch)
+		assert.Equal(t, s.expected.Additional, actual.Additional)
+	}
+}
+
+func TestGitVersionIsOlderThan(t *testing.T) {
+	assert.False(t, (&GitVersion{2, 0, 0, ""}).IsOlderThan(1, 99, 99))
+	assert.False(t, (&GitVersion{2, 0, 0, ""}).IsOlderThan(2, 0, 0))
+	assert.False(t, (&GitVersion{2, 1, 0, ""}).IsOlderThan(2, 0, 9))
+
+	assert.True(t, (&GitVersion{2, 0, 1, ""}).IsOlderThan(2, 1, 0))
+	assert.True(t, (&GitVersion{2, 0, 1, ""}).IsOlderThan(3, 0, 0))
+}