import related code from micro repo

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util_test.go

@@ -0,0 +1,46 @@
+package grpc
+
+import (
+	"testing"
+)
+
+func TestServiceMethod(t *testing.T) {
+	type testCase struct {
+		input   string
+		service string
+		method  string
+		err     bool
+	}
+
+	methods := []testCase{
+		{"Foo.Bar", "Foo", "Bar", false},
+		{"/Foo/Bar", "Foo", "Bar", false},
+		{"/package.Foo/Bar", "Foo", "Bar", false},
+		{"/a.package.Foo/Bar", "Foo", "Bar", false},
+		{"a.package.Foo/Bar", "", "", true},
+		{"/Foo/Bar/Baz", "", "", true},
+		{"Foo.Bar.Baz", "", "", true},
+	}
+	for _, test := range methods {
+		service, method, err := serviceMethod(test.input)
+		if err != nil && test.err == true {
+			continue
+		}
+		// unexpected error
+		if err != nil && test.err == false {
+			t.Fatalf("unexpected err %v for %+v", err, test)
+		}
+		// expecter error
+		if test.err == true && err == nil {
+			t.Fatalf("expected error for %+v: got service: %s method: %s", test, service, method)
+		}
+
+		if service != test.service {
+			t.Fatalf("wrong service for %+v: got service: %s method: %s", test, service, method)
+		}
+
+		if method != test.method {
+			t.Fatalf("wrong method for %+v: got service: %s method: %s", test, service, method)
+		}
+	}
+}