Rollup merge of #39615 - phungleson:corefloat, r=alexcrichton

Improve format float

* Move float into mod float like in test
* Add more tests for f64 f32, lower exp, upper exp, which can come if handy in the future if we want refactor further
* Use `assert_eq` for clearer error messages

1 files changed, 25 insertions, 7 deletions

diff --git a/src/libcoretest/fmt/float.rs b/src/libcoretest/fmt/float.rs
index 16cd2feddc0..695001312e4 100644
--- a/src/libcoretest/fmt/float.rs
+++ b/src/libcoretest/fmt/float.rs
@@ -9,11 +9,29 @@
 // except according to those terms.
 
 #[test]
-fn test_format_float() {
-    assert!("1" == format!("{:.0}", 1.0f64));
-    assert!("9" == format!("{:.0}", 9.4f64));
-    assert!("10" == format!("{:.0}", 9.9f64));
-    assert!("9.8" == format!("{:.1}", 9.849f64));
-    assert!("9.9" == format!("{:.1}", 9.851f64));
-    assert!("1" == format!("{:.0}", 0.5f64));
+fn test_format_f64() {
+    assert_eq!("1", format!("{:.0}", 1.0f64));
+    assert_eq!("9", format!("{:.0}", 9.4f64));
+    assert_eq!("10", format!("{:.0}", 9.9f64));
+    assert_eq!("9.8", format!("{:.1}", 9.849f64));
+    assert_eq!("9.9", format!("{:.1}", 9.851f64));
+    assert_eq!("1", format!("{:.0}", 0.5f64));
+    assert_eq!("1.23456789e6", format!("{:e}", 1234567.89f64));
+    assert_eq!("1.23456789e3", format!("{:e}", 1234.56789f64));
+    assert_eq!("1.23456789E6", format!("{:E}", 1234567.89f64));
+    assert_eq!("1.23456789E3", format!("{:E}", 1234.56789f64));
+}
+
+#[test]
+fn test_format_f32() {
+    assert_eq!("1", format!("{:.0}", 1.0f32));
+    assert_eq!("9", format!("{:.0}", 9.4f32));
+    assert_eq!("10", format!("{:.0}", 9.9f32));
+    assert_eq!("9.8", format!("{:.1}", 9.849f32));
+    assert_eq!("9.9", format!("{:.1}", 9.851f32));
+    assert_eq!("1", format!("{:.0}", 0.5f32));
+    assert_eq!("1.2345679e6", format!("{:e}", 1234567.89f32));
+    assert_eq!("1.2345679e3", format!("{:e}", 1234.56789f32));
+    assert_eq!("1.2345679E6", format!("{:E}", 1234567.89f32));
+    assert_eq!("1.2345679E3", format!("{:E}", 1234.56789f32));
 }