Move working checks into separate test files

Author: GuillaumeGomez

Diff for: src/test/rustdoc-ui/doc-test-attr-pass.rs

@@ -0,0 +1,8 @@
+// check-pass
+
+#![crate_type = "lib"]
+#![deny(invalid_doc_attributes)]
+#![doc(test(no_crate_inject))]
+#![doc(test(attr(deny(warnings))))]
+
+pub fn foo() {}

Diff for: src/test/rustdoc-ui/doc-test-attr.rs

@@ -10,7 +10,5 @@
 #![doc(test(a))]
 //~^ ERROR unknown `doc(test)` attribute `a`
 //~^^ WARN this was previously accepted by the compiler
-#![doc(test(no_crate_inject))]
-#![doc(test(attr(deny(warnings))))]
 
 pub fn foo() {}

Diff for: src/test/ui/rustdoc/doc-test-attr-pass.rs

@@ -0,0 +1,9 @@
+// check-pass
+
+#![crate_type = "lib"]
+#![deny(invalid_doc_attributes)]
+#![doc(test(no_crate_inject))]
+#![doc(test(attr(deny(warnings))))]
+#![doc(test())]
+
+pub fn foo() {}

Diff for: src/test/ui/rustdoc/doc-test-attr.rs

@@ -10,7 +10,5 @@
 #![doc(test(a))]
 //~^ ERROR unknown `doc(test)` attribute `a`
 //~^^ WARN this was previously accepted by the compiler
-#![doc(test(no_crate_inject))]
-#![doc(test(attr(deny(warnings))))]
 
 pub fn foo() {}