public void stringX() { assertEquals("Input: stringX(\"xxHxix\")", "xHix", exercises.StringX("xxHxix")); assertEquals("Input: stringX(\"abxxxcd\")", "abcd", exercises.StringX("abxxxcd")); assertEquals("Input: stringX(\"xabxxxcdx\")", "xabcdx", exercises.StringX("xabxxxcdx")); assertEquals("Input: stringX(\"xKittenx\")", "xKittenx", exercises.StringX("xKittenx")); assertEquals("Input: stringX(\"Hello\")", "Hello", exercises.StringX("Hello")); assertEquals("Input: stringX(\"xx\")", "xx", exercises.StringX("xx")); assertEquals("Input: stringX(\"x\")", "x", exercises.StringX("x")); assertEquals("Input: stringX(\"\")", "", exercises.StringX("")); }