test: Don't compare floats for strict equality

Cargo.lock

@@ -1913,6 +1913,7 @@ dependencies = [
  "rand_seeder",
  "serde",
  "snafu",
+ "test_helpers",
  "tokio",
  "toml",
  "tracing",

iox_data_generator/Cargo.toml

@@ -31,6 +31,7 @@ uuid = { version = "0.8.1", default_features = false }
 
 [dev-dependencies]
 criterion = "0.3.3"
+test_helpers = { path = "../test_helpers" }
 
 [[bench]]
 name = "point_generation"

iox_data_generator/src/field.rs

@@ -406,6 +406,7 @@ fn field_spec_to_generator<T: DataGenRng>(
 mod test {
     use super::*;
     use crate::{DynamicRng, ZeroRng, TEST_SEED};
+    use test_helpers::approximately_equal;
 
     type Error = Box<dyn std::error::Error>;
     type Result<T = (), E = Error> = std::result::Result<T, E>;
@@ -566,7 +567,7 @@ mod test {
 
         // All the values generated will always be the same known value.
         assert!(
-            f64_fields.iter().all(|f| *f == start_and_end),
+            f64_fields.iter().all(|f| approximately_equal(*f, start_and_end)),
             "{:?}",
             f64_fields
         );