add unit tests

libs/testdiff/replacement.go

@@ -20,7 +20,7 @@ const (
 )
 
 var (
-	// From https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+	// source: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
 	semverRegex      = regexp.MustCompile(`(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?`)
 	uuidRegex        = regexp.MustCompile(`[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}`)
 	numIdRegex       = regexp.MustCompile(`[0-9]{3,}`)

libs/testdiff/replacement_test.go

@@ -1,6 +1,7 @@
 package testdiff
 
 import (
+	"runtime"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -44,3 +45,21 @@ func TestReplacement_TemporaryDirectory(t *testing.T) {
 
 	assert.Equal(t, "/tmp/.../tail", repls.Replace("/tmp/foo/bar/qux/tail"))
 }
+
+func TestReplacement_OS(t *testing.T) {
+	var repls ReplacementsContext
+
+	PrepareReplacementOS(t, &repls)
+
+	assert.Equal(t, "[OS]", repls.Replace(runtime.GOOS))
+}
+
+func TestReplacement_Semver(t *testing.T) {
+	var repls ReplacementsContext
+
+	PrepareReplacementsSemver(t, &repls)
+
+	assert.Equal(t, "[SEMVER]", repls.Replace("1.2.3"))
+	assert.Equal(t, "[SEMVER]", repls.Replace("1.2.3-alpha"))
+	assert.Equal(t, "[SEMVER]", repls.Replace("1.2.3-alpha+build"))
+}