public void stringYak() { assertEquals("Input: stringYak(\"yakpak\")", "pak", exercises.StringYak("yakpak")); assertEquals("Input: stringYak(\"pakyak\")", "pak", exercises.StringYak("pakyak")); assertEquals("Input: stringYak(\"yak123ya\")", "123ya", exercises.StringYak("yak123ya")); assertEquals("Input: stringYak(\"yak\")", "", exercises.StringYak("yak")); assertEquals("Input: tringYak(\"yakxxxyak\")", "xxx", exercises.StringYak("yakxxxyak")); assertEquals("Input: stringYak(\"HiyakHi\")", "HiHi", exercises.StringYak("HiyakHi")); assertEquals("Input: stringYak(\"xxxyakyyyakzzz\")", "xxxyyzzz", exercises.StringYak("xxxyakyyyakzzz")); }