refactor: unify naming in ResourceHarness methods

Author: simschla

app/src/test/java/com/diffplug/spotless/cli/steps/RemoveUnusedImportsTest.java

@@ -31,7 +31,7 @@ void itRemovesUnusedImportsWithDefaultEngine() {
 
         assertFile("Java.java")
                 .notSameSasResource("java/removeunusedimports/JavaCodeWithLicensePackageUnformatted.test")
-                .hasNotContent("Unused");
+                .notHasContent("Unused");
 
         selfie().expectResource("Java.java").toMatchDisk();
     }
@@ -48,7 +48,7 @@ void itRemovesWithExplicitDefaultEngine() {
 
         assertFile("Java.java")
                 .notSameSasResource("java/removeunusedimports/JavaCodeWithLicensePackageUnformatted.test")
-                .hasNotContent("Unused");
+                .notHasContent("Unused");
 
         selfie().expectResource("Java.java").toMatchDisk();
     }
@@ -65,7 +65,7 @@ void itRemovesWithExplicitCleanThatEngine() {
 
         assertFile("Java.java")
                 .notSameSasResource("java/removeunusedimports/JavaCodeWithLicensePackageUnformatted.test")
-                .hasNotContent("Unused");
+                .notHasContent("Unused");
 
         selfie().expectResource("Java.java").toMatchDisk();
     }

testlib/src/main/java/com/diffplug/spotless/ResourceHarness.java

@@ -205,15 +205,15 @@ public ReadAsserter hasContent(String expected) {
             return hasContent(expected, StandardCharsets.UTF_8);
         }
 
-        public ReadAsserter hasNotContent(String notExpected) {
-            return notHasContent(notExpected, StandardCharsets.UTF_8);
-        }
-
         public ReadAsserter hasContent(String expected, Charset charset) {
             assertThat(file).usingCharset(charset).hasContent(expected);
             return this;
         }
 
+        public ReadAsserter notHasContent(String notExpected) {
+            return notHasContent(notExpected, StandardCharsets.UTF_8);
+        }
+
         public ReadAsserter notHasContent(String notExpected, Charset charset) {
             assertThat(file).usingCharset(charset).content().isNotEqualTo(notExpected);
             return this;
@@ -228,7 +228,7 @@ public ReadAsserter sameAsResource(String resource) {
         }
 
         public ReadAsserter notSameSasResource(String resource) {
-            return hasNotContent(getTestResource(resource));
+            return notHasContent(getTestResource(resource));
         }
 
         public ReadAsserter matches(Consumer<AbstractCharSequenceAssert<?, String>> conditions) throws IOException {