Moving metric naming to it's own package

pkg/naming/regex_matcher_test.go

@@ -0,0 +1,49 @@
+package naming
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/directxman12/k8s-prometheus-adapter/pkg/config"
+)
+
+func TestReMatcherIs(t *testing.T) {
+	filter := config.RegexFilter{
+		Is: "my_.*",
+	}
+
+	matcher, err := NewReMatcher(filter)
+	require.NoError(t, err)
+
+	result := matcher.Matches("my_label")
+	require.True(t, result)
+
+	result = matcher.Matches("your_label")
+	require.False(t, result)
+}
+
+func TestReMatcherIsNot(t *testing.T) {
+	filter := config.RegexFilter{
+		IsNot: "my_.*",
+	}
+
+	matcher, err := NewReMatcher(filter)
+	require.NoError(t, err)
+
+	result := matcher.Matches("my_label")
+	require.False(t, result)
+
+	result = matcher.Matches("your_label")
+	require.True(t, result)
+}
+
+func TestEnforcesIsOrIsNotButNotBoth(t *testing.T) {
+	filter := config.RegexFilter{
+		Is:    "my_.*",
+		IsNot: "your_.*",
+	}
+
+	_, err := NewReMatcher(filter)
+	require.Error(t, err)
+}