move contents of taskchampion repo to tc/

rust/integration-tests/src/bindings_tests/mod.rs

@@ -0,0 +1,30 @@
+use std::fs;
+
+extern "C" {
+    // set up to send test output to TEST-OUTPUT
+    fn setup_output();
+    // close the output file
+    fn finish_output();
+}
+
+// Each suite is represented by a <name>_tests C function in <name>.c.
+// All of these C files are built into a library that is linked to the crate -- but not to test
+// crates.  So, this macro produces a "glue function" that calls the C function, and that can be
+// called from test crates.
+macro_rules! suite(
+    { $s:ident } => {
+    pub fn $s() -> (i32, String) {
+        extern "C" {
+            fn $s() -> i32;
+        }
+        unsafe { setup_output() };
+        let res = unsafe { $s() };
+        unsafe { finish_output() };
+        let output = fs::read_to_string("TEST-OUTPUT")
+            .unwrap_or_else(|e| format!("could not open TEST-OUTPUT: {}", e));
+        (res, output)
+    }
+    };
+);
+
+include!(concat!(env!("OUT_DIR"), "/bindings_test_suites.rs"));