Add NonZero assertion function

Author: pellared

f/obj.go

@@ -60,3 +60,13 @@ func (x FluentObj[T]) Zero() FailureMessage {
 	}
 	return FailureMessage("not a zero value (-want +got):\n" + diff)
 }
+
+// NonZero tests if the object is a non-zero value.
+func (x FluentObj[T]) NonZero() FailureMessage {
+	var want T
+	ok := cmp.Equal(want, x.Got)
+	if !ok {
+		return ""
+	}
+	return FailureMessage("a zero value")
+}

f/obj_test.go

@@ -71,6 +71,24 @@ func TestObj(t *testing.T) {
 		})
 	})
 
+	t.Run("NonZero", func(t *testing.T) {
+		t.Run("Passed", func(t *testing.T) {
+			got := A{Str: "string"}
+			msg := f.Obj(got).NonZero()
+			assertPassed(t, msg)
+		})
+		t.Run("Failed", func(t *testing.T) {
+			got := A{}
+			msg := f.Obj(got).NonZero()
+			assertFailed(t, msg, "a zero value")
+		})
+		t.Run("nil", func(t *testing.T) {
+			var got *A
+			msg := f.Obj(got).NonZero()
+			assertFailed(t, msg, "a zero value")
+		})
+	})
+
 	t.Run("Check", func(t *testing.T) {
 		t.Run("Passed", func(t *testing.T) {
 			fn := func(x A) string {