Merge pull request #1649 from neonailol/header-does-exist-matcher

spring-test/src/main/java/org/springframework/test/web/servlet/result/HeaderResultMatchers.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -90,6 +90,15 @@ public class HeaderResultMatchers {
 		};
 	}
 
+	/**
+	 * Assert that the named response header does exist.
+	 * @since 5.0.3
+	 */
+	public ResultMatcher doesExist(final String name) {
+		return result -> assertTrue("Response should contain header '" + name + "'",
+				result.getResponse().containsHeader(name));
+	}
+
 	/**
 	 * Assert that the named response header does not exist.
 	 * @since 4.0

spring-test/src/test/java/org/springframework/test/web/servlet/samples/standalone/resultmatchers/HeaderAssertionTests.java

@@ -154,6 +154,16 @@ public class HeaderAssertionTests {
 		this.mockMvc.perform(get("/persons/1")).andExpect(header().doesNotExist(LAST_MODIFIED));
 	}
 
+	@Test
+	public void doesExist() throws Exception {
+		this.mockMvc.perform(get("/persons/1")).andExpect(header().doesExist(LAST_MODIFIED));
+	}
+
+	@Test(expected = AssertionError.class)
+	public void doesExistFail() throws Exception {
+		this.mockMvc.perform(get("/persons/1")).andExpect(header().doesExist("X-Custom-Header"));
+	}
+
 	@Test
 	public void stringWithIncorrectResponseHeaderValue() throws Exception {
 		assertIncorrectResponseHeader(header().string(LAST_MODIFIED, secondLater), secondLater);