Client: fix check for WithPrefix op

Make sure that WithPrefix correctly set the flag, and add test.
Also, add test for WithFromKey.

fixes #14056

Signed-off-by: Sahdev Zala <spzala@us.ibm.com>

client/v3/op_test.go

@@ -75,3 +75,27 @@ func TestIsSortOptionValid(t *testing.T) {
 		}
 	}
 }
+
+func TestIsOptsWithPrefix(t *testing.T) {
+	optswithprefix := []OpOption{WithPrefix()}
+	if !IsOptsWithPrefix(optswithprefix) {
+		t.Errorf("IsOptsWithPrefix = false, expected true")
+	}
+
+	optswithfromkey := []OpOption{WithFromKey()}
+	if IsOptsWithPrefix(optswithfromkey) {
+		t.Errorf("IsOptsWithPrefix = true, expected false")
+	}
+}
+
+func TestIsOptsWithFromKey(t *testing.T) {
+	optswithfromkey := []OpOption{WithFromKey()}
+	if !IsOptsWithFromKey(optswithfromkey) {
+		t.Errorf("IsOptsWithFromKey = false, expected true")
+	}
+
+	optswithprefix := []OpOption{WithPrefix()}
+	if IsOptsWithFromKey(optswithprefix) {
+		t.Errorf("IsOptsWithFromKey = true, expected false")
+	}
+}