goipgrep: refactor into module; pure-Go ping/resolve; cache+CI; drop binary

projects/go-tools/go/goipgrep/internal/extract/extract_test.go

@@ -0,0 +1,36 @@
+package extract
+
+import (
+	"context"
+	"strings"
+	"testing"
+)
+
+func TestGrepIPv4(t *testing.T) {
+	in := "a 1.2.3.4 b 999.2.3.4 c\nx 10.0.0.1 y"
+	var got []string
+	err := Grep(context.Background(), strings.NewReader(in), Options{Mode: ModeIP}, func(s string) {
+		got = append(got, s)
+	})
+	if err != nil {
+		t.Fatalf("Grep: %v", err)
+	}
+	// Candidate matcher intentionally returns 999.2.3.4 too; validation happens elsewhere.
+	if len(got) != 3 {
+		t.Fatalf("got %d matches: %#v", len(got), got)
+	}
+}
+
+func TestGrepMAC(t *testing.T) {
+	in := "aa:bb:cc:dd:ee:ff aabb.ccdd.eeff 00-11-22-33-44-55"
+	var got []string
+	err := Grep(context.Background(), strings.NewReader(in), Options{Mode: ModeMAC}, func(s string) {
+		got = append(got, s)
+	})
+	if err != nil {
+		t.Fatalf("Grep: %v", err)
+	}
+	if len(got) != 3 {
+		t.Fatalf("got %d matches: %#v", len(got), got)
+	}
+}