KCL: Better message on assertEqual function (#3898)

Also add a new no-visual test for performance testing.

src/wasm-lib/kcl/src/std/assert.rs

@@ -79,7 +79,14 @@ pub async fn assert_gt(args: Args) -> Result<KclValue, KclError> {
     name = "assertEqual",
 }]
 async fn inner_assert_equal(left: f64, right: f64, epsilon: f64, message: &str, args: &Args) -> Result<(), KclError> {
-    _assert((right - left).abs() < epsilon, message, args).await
+    if (right - left).abs() < epsilon {
+        Ok(())
+    } else {
+        Err(KclError::Type(KclErrorDetails {
+            message: format!("assert failed because {left} != {right}: {message}"),
+            source_ranges: vec![args.source_range],
+        }))
+    }
 }
 
 pub async fn assert_equal(args: Args) -> Result<KclValue, KclError> {

src/wasm-lib/tests/executor/inputs/no_visuals/add_lots.kcl

@@ -0,0 +1,107 @@
+fn f = (i) => {
+  return i * 2  
+}
+
+let x = f(0)
++ f(1)
++ f(2)
++ f(3)
++ f(4)
++ f(5)
++ f(6)
++ f(7)
++ f(8)
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++ f(16)
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++ f(32)
++ f(33)
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++ f(38)
++ f(39)
++ f(40)
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++ f(43)
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++ f(46)
++ f(47)
++ f(48)
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++ f(62)
++ f(63)
++ f(64)
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++ f(68)
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++ f(95)
++ f(96)
++ f(97)
++ f(98)
++ f(99)
++ f(100)
+
+assertEqual(x, 10100, 0.1, "Big sum")

src/wasm-lib/tests/executor/no_visuals.rs

@@ -86,3 +86,4 @@ gen_test_fail!(
     "undefined value: Property 'age' not found in object"
 );
 gen_test!(sketch_group_in_object);
+gen_test!(add_lots);