### Question:
EnvironmentPropertySource extends PropertySource<Environment> { public static String resolvePlaceholders(StandardEnvironment preparedEnvironment, String text) { text = ESCAPED_PLACEHOLDERS.matcher(text).replaceAll("\\$_{"); return preparedEnvironment.resolvePlaceholders(text).replace("$_{", "${"); } EnvironmentPropertySource(Environment sources); static StandardEnvironment prepareEnvironment(Environment environment); static String resolvePlaceholders(StandardEnvironment preparedEnvironment, String text); @Override Object getProperty(String name);  }### Answer:
@Test public void testEscapedPlaceholdersRemoved() { assertThat(resolvePlaceholders(this.env, "\\${abc}")).isEqualTo("${abc}"); assertThat(resolvePlaceholders(this.env, "\\\\${abc}")).isEqualTo("${abc}"); }