diff --git a/crates/cli/tests/cli_run.rs b/crates/cli/tests/cli_run.rs
index f753c5e866..8c6f3683e4 100644
--- a/crates/cli/tests/cli_run.rs
+++ b/crates/cli/tests/cli_run.rs
@@ -1227,6 +1227,40 @@ mod cli_run {
         );
     }
 
+    #[test]
+    #[serial(multi_dep_thunk)]
+    #[cfg_attr(windows, ignore)]
+    fn run_package_unoptimized() {
+        check_output_with_stdin(
+            &fixture_file("packages", "app.roc"),
+            &[],
+            "packages-test",
+            &[],
+            &[],
+            &[],
+            "I am Dep2.value2\n",
+            UseValgrind::Yes,
+            TestCliCommands::Run,
+        );
+    }
+
+    #[test]
+    #[serial(multi_dep_thunk)]
+    #[cfg_attr(windows, ignore)]
+    fn run_package_optimized() {
+        check_output_with_stdin(
+            &fixture_file("packages", "app.roc"),
+            &[],
+            "packages-test",
+            &[OPTIMIZE_FLAG],
+            &[],
+            &[],
+            "I am Dep2.value2\n",
+            UseValgrind::Yes,
+            TestCliCommands::Run,
+        );
+    }
+
     #[test]
     fn known_type_error() {
         check_compile_error(
diff --git a/crates/cli/tests/fixtures/packages/app.roc b/crates/cli/tests/fixtures/packages/app.roc
new file mode 100644
index 0000000000..a37bee685b
--- /dev/null
+++ b/crates/cli/tests/fixtures/packages/app.roc
@@ -0,0 +1,6 @@
+app "packages-test"
+    packages { pf: "platform/main.roc", json: "json/main.roc", csv: "csv/main.roc" }
+    imports [json.JsonParser, csv.Csv]
+    provides [main] to pf
+
+main = "Hello, World! \(JsonParser.example) \(Csv.example)"
diff --git a/crates/cli/tests/fixtures/packages/csv/Csv.roc b/crates/cli/tests/fixtures/packages/csv/Csv.roc
new file mode 100644
index 0000000000..55367d1b9e
--- /dev/null
+++ b/crates/cli/tests/fixtures/packages/csv/Csv.roc
@@ -0,0 +1,6 @@
+interface Csv
+    exposes [example]
+    imports [dep.CsvDep]
+
+example : Str
+example = "This text came from a CSV package: \(CsvDep.stuff)!"
\ No newline at end of file
diff --git a/crates/cli/tests/fixtures/packages/csv/main.roc b/crates/cli/tests/fixtures/packages/csv/main.roc
new file mode 100644
index 0000000000..12d60ce654
--- /dev/null
+++ b/crates/cli/tests/fixtures/packages/csv/main.roc
@@ -0,0 +1,3 @@
+package "csv"
+    exposes [Csv]
+    packages {}
\ No newline at end of file
diff --git a/examples/json/JsonParser.roc b/crates/cli/tests/fixtures/packages/json/JsonParser.roc
similarity index 100%
rename from examples/json/JsonParser.roc
rename to crates/cli/tests/fixtures/packages/json/JsonParser.roc
diff --git a/examples/json/main.roc b/crates/cli/tests/fixtures/packages/json/main.roc
similarity index 100%
rename from examples/json/main.roc
rename to crates/cli/tests/fixtures/packages/json/main.roc
diff --git a/crates/cli/tests/fixtures/packages/platform/host.zig b/crates/cli/tests/fixtures/packages/platform/host.zig
new file mode 100644
index 0000000000..bb797f2bf3
--- /dev/null
+++ b/crates/cli/tests/fixtures/packages/platform/host.zig
@@ -0,0 +1,127 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const str = @import("str");
+const RocStr = str.RocStr;
+const testing = std.testing;
+const expectEqual = testing.expectEqual;
+const expect = testing.expect;
+
+comptime {
+    // This is a workaround for https://github.com/ziglang/zig/issues/8218
+    // which is only necessary on macOS.
+    //
+    // Once that issue is fixed, we can undo the changes in
+    // 177cf12e0555147faa4d436e52fc15175c2c4ff0 and go back to passing
+    // -fcompiler-rt in link.rs instead of doing this. Note that this
+    // workaround is present in many host.zig files, so make sure to undo
+    // it everywhere!
+    if (builtin.os.tag == .macos) {
+        _ = @import("compiler_rt");
+    }
+}
+
+const mem = std.mem;
+const Allocator = mem.Allocator;
+
+extern fn roc__mainForHost_1_exposed_generic(*RocStr) void;
+
+const Align = 2 * @alignOf(usize);
+extern fn malloc(size: usize) callconv(.C) ?*align(Align) anyopaque;
+extern fn realloc(c_ptr: [*]align(Align) u8, size: usize) callconv(.C) ?*anyopaque;
+extern fn free(c_ptr: [*]align(Align) u8) callconv(.C) void;
+extern fn memcpy(dst: [*]u8, src: [*]u8, size: usize) callconv(.C) void;
+extern fn memset(dst: [*]u8, value: i32, size: usize) callconv(.C) void;
+
+export fn roc_alloc(size: usize, alignment: u32) callconv(.C) ?*anyopaque {
+    _ = alignment;
+    return malloc(size);
+}
+
+export fn roc_realloc(c_ptr: *anyopaque, new_size: usize, old_size: usize, alignment: u32) callconv(.C) ?*anyopaque {
+    _ = old_size;
+    _ = alignment;
+    return realloc(@alignCast(16, @ptrCast([*]u8, c_ptr)), new_size);
+}
+
+export fn roc_dealloc(c_ptr: *anyopaque, alignment: u32) callconv(.C) void {
+    _ = alignment;
+    free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
+}
+
+export fn roc_memcpy(dst: [*]u8, src: [*]u8, size: usize) callconv(.C) void {
+    return memcpy(dst, src, size);
+}
+
+export fn roc_memset(dst: [*]u8, value: i32, size: usize) callconv(.C) void {
+    return memset(dst, value, size);
+}
+
+export fn roc_panic(c_ptr: *anyopaque, tag_id: u32) callconv(.C) void {
+    _ = tag_id;
+
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
+extern fn kill(pid: c_int, sig: c_int) c_int;
+extern fn shm_open(name: *const i8, oflag: c_int, mode: c_uint) c_int;
+extern fn mmap(addr: ?*anyopaque, length: c_uint, prot: c_int, flags: c_int, fd: c_int, offset: c_uint) *anyopaque;
+extern fn getppid() c_int;
+
+fn roc_getppid() callconv(.C) c_int {
+    return getppid();
+}
+
+fn roc_getppid_windows_stub() callconv(.C) c_int {
+    return 0;
+}
+
+fn roc_shm_open(name: *const i8, oflag: c_int, mode: c_uint) callconv(.C) c_int {
+    return shm_open(name, oflag, mode);
+}
+fn roc_mmap(addr: ?*anyopaque, length: c_uint, prot: c_int, flags: c_int, fd: c_int, offset: c_uint) callconv(.C) *anyopaque {
+    return mmap(addr, length, prot, flags, fd, offset);
+}
+
+comptime {
+    if (builtin.os.tag == .macos or builtin.os.tag == .linux) {
+        @export(roc_getppid, .{ .name = "roc_getppid", .linkage = .Strong });
+        @export(roc_mmap, .{ .name = "roc_mmap", .linkage = .Strong });
+        @export(roc_shm_open, .{ .name = "roc_shm_open", .linkage = .Strong });
+    }
+
+    if (builtin.os.tag == .windows) {
+        @export(roc_getppid_windows_stub, .{ .name = "roc_getppid", .linkage = .Strong });
+    }
+}
+
+const Unit = extern struct {};
+
+pub export fn main() i32 {
+    const stdout = std.io.getStdOut().writer();
+    const stderr = std.io.getStdErr().writer();
+
+    var timer = std.time.Timer.start() catch unreachable;
+
+    // actually call roc to populate the callresult
+    var callresult = RocStr.empty();
+    roc__mainForHost_1_exposed_generic(&callresult);
+
+    const nanos = timer.read();
+    const seconds = (@intToFloat(f64, nanos) / 1_000_000_000.0);
+
+    // stdout the result
+    stdout.print("{s}\n", .{callresult.asSlice()}) catch unreachable;
+
+    callresult.deinit();
+
+    stderr.print("runtime: {d:.3}ms\n", .{seconds * 1000}) catch unreachable;
+
+    return 0;
+}
+
+fn to_seconds(tms: std.os.timespec) f64 {
+    return @intToFloat(f64, tms.tv_sec) + (@intToFloat(f64, tms.tv_nsec) / 1_000_000_000.0);
+}
diff --git a/crates/cli/tests/fixtures/packages/platform/main.roc b/crates/cli/tests/fixtures/packages/platform/main.roc
new file mode 100644
index 0000000000..edc3368f93
--- /dev/null
+++ b/crates/cli/tests/fixtures/packages/platform/main.roc
@@ -0,0 +1,9 @@
+platform "multi-module"
+    requires {}{ main : Str }
+    exposes []
+    packages {}
+    imports []
+    provides [mainForHost]
+
+mainForHost : Str
+mainForHost = main