Add a test for remap-path-prefix

Author: goffrie

test/unit/remap_path_prefix/BUILD.bazel

@@ -0,0 +1,14 @@
+load("//rust:defs.bzl", "rust_test", "rust_library")
+
+rust_library(
+    name = "dep",
+    srcs = ["dep.rs"],
+    edition = "2018",
+)
+
+rust_test(
+    name = "remap_path_prefix",
+    srcs = ["test.rs"],
+    edition = "2018",
+    deps = [":dep"],
+)

test/unit/remap_path_prefix/dep.rs

@@ -0,0 +1,4 @@
+// Without --remap-path-prefix, Location::caller() in this generic function will return an absolute path
+pub fn get_file_name<T>() -> &'static str {
+    std::panic::Location::caller().file()
+}

test/unit/remap_path_prefix/test.rs

@@ -0,0 +1,4 @@
+#[test]
+fn test_dep_file_name() {
+    assert_eq!(dep::get_file_name::<()>(), "test/unit/remap_path_prefix/dep.rs");
+}