Only build effects platform once in roc_cli tests

crates/cli/tests/cli_run.rs

@@ -367,6 +367,8 @@ mod cli_run {
         )
     }
 
+    static BUILD_EFFECTS_PLATFORM: std::sync::Once = std::sync::Once::new();
+
     #[allow(clippy::too_many_arguments)]
     fn test_roc_app(
         dir_name: &str,
@@ -438,6 +440,22 @@ mod cli_run {
             custom_flags = vec![LINKER_FLAG, "legacy"];
         }
 
+        if dir_name.to_ascii_lowercase().contains("effectful")
+            || roc_filename.ends_with("effects.roc")
+        {
+            BUILD_EFFECTS_PLATFORM.call_once(|| {
+                run_roc_on(
+                    Path::new("../../examples/cli/effects.roc"),
+                    [CMD_BUILD],
+                    &[],
+                    &[],
+                    &[],
+                );
+            });
+
+            custom_flags.push(PREBUILT_PLATFORM);
+        }
+
         // Check with and without optimizations
         check_output_with_stdin(
             &file_name,
@@ -986,6 +1004,21 @@ mod cli_run {
         );
     }
 
+    #[test]
+    #[cfg_attr(windows, ignore)]
+    fn interactive_effects() {
+        test_roc_app(
+            "examples/cli",
+            "effects.roc",
+            &["hi there!"],
+            &[],
+            &[],
+            "hi there!\nIt is known\n",
+            UseValgrind::Yes,
+            TestCliCommands::Run,
+        )
+    }
+
     #[test]
     #[cfg_attr(windows, ignore)]
     fn effectful_hello() {
@@ -1255,21 +1288,6 @@ mod cli_run {
         assert_valid_roc_check_status(out.status);
     }
 
-    #[test]
-    #[cfg_attr(windows, ignore)]
-    fn interactive_effects() {
-        test_roc_app(
-            "examples/cli",
-            "effects.roc",
-            &["hi there!"],
-            &[],
-            &[],
-            "hi there!\nIt is known\n",
-            UseValgrind::Yes,
-            TestCliCommands::Run,
-        )
-    }
-
     #[test]
     #[cfg_attr(windows, ignore)]
     // tea = The Elm Architecture