1 files changed, 110 insertions, 0 deletions
diff --git a/compiler/rustc_expand/src/tokenstream/tests.rs b/compiler/rustc_expand/src/tokenstream/tests.rs
new file mode 100644
index 000000000..eed696810
--- /dev/null
+++ b/compiler/rustc_expand/src/tokenstream/tests.rs
@@ -0,0 +1,110 @@
+use crate::tests::string_to_stream;
+
+use rustc_ast::token;
+use rustc_ast::tokenstream::{TokenStream, TokenStreamBuilder};
+use rustc_span::create_default_session_globals_then;
+use rustc_span::{BytePos, Span, Symbol};
+
+fn string_to_ts(string: &str) -> TokenStream {
+    string_to_stream(string.to_owned())
+}
+
+fn sp(a: u32, b: u32) -> Span {
+    Span::with_root_ctxt(BytePos(a), BytePos(b))
+}
+
+#[test]
+fn test_concat() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("foo::bar::baz");
+        let test_fst = string_to_ts("foo::bar");
+        let test_snd = string_to_ts("::baz");
+        let mut builder = TokenStreamBuilder::new();
+        builder.push(test_fst);
+        builder.push(test_snd);
+        let eq_res = builder.build();
+        assert_eq!(test_res.trees().count(), 5);
+        assert_eq!(eq_res.trees().count(), 5);
+        assert_eq!(test_res.eq_unspanned(&eq_res), true);
+    })
+}
+
+#[test]
+fn test_to_from_bijection() {
+    create_default_session_globals_then(|| {
+        let test_start = string_to_ts("foo::bar(baz)");
+        let test_end = test_start.trees().cloned().collect();
+        assert_eq!(test_start, test_end)
+    })
+}
+
+#[test]
+fn test_eq_0() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("foo");
+        let test_eqs = string_to_ts("foo");
+        assert_eq!(test_res, test_eqs)
+    })
+}
+
+#[test]
+fn test_eq_1() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("::bar::baz");
+        let test_eqs = string_to_ts("::bar::baz");
+        assert_eq!(test_res, test_eqs)
+    })
+}
+
+#[test]
+fn test_eq_3() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("");
+        let test_eqs = string_to_ts("");
+        assert_eq!(test_res, test_eqs)
+    })
+}
+
+#[test]
+fn test_diseq_0() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("::bar::baz");
+        let test_eqs = string_to_ts("bar::baz");
+        assert_eq!(test_res == test_eqs, false)
+    })
+}
+
+#[test]
+fn test_diseq_1() {
+    create_default_session_globals_then(|| {
+        let test_res = string_to_ts("(bar,baz)");
+        let test_eqs = string_to_ts("bar,baz");
+        assert_eq!(test_res == test_eqs, false)
+    })
+}
+
+#[test]
+fn test_is_empty() {
+    create_default_session_globals_then(|| {
+        let test0 = TokenStream::default();
+        let test1 = TokenStream::token_alone(token::Ident(Symbol::intern("a"), false), sp(0, 1));
+        let test2 = string_to_ts("foo(bar::baz)");
+
+        assert_eq!(test0.is_empty(), true);
+        assert_eq!(test1.is_empty(), false);
+        assert_eq!(test2.is_empty(), false);
+    })
+}
+
+#[test]
+fn test_dotdotdot() {
+    create_default_session_globals_then(|| {
+        let mut builder = TokenStreamBuilder::new();
+        builder.push(TokenStream::token_joint(token::Dot, sp(0, 1)));
+        builder.push(TokenStream::token_joint(token::Dot, sp(1, 2)));
+        builder.push(TokenStream::token_alone(token::Dot, sp(2, 3)));
+        let stream = builder.build();
+        assert!(stream.eq_unspanned(&string_to_ts("...")));
+        assert_eq!(stream.trees().count(), 1);
+    })
+}