Add error for division by zero using "=" (#2002) (#2030)

* error for division by zero with =

* cargo fmt

* add helper zero_division_error

* tests for zero division error

* fix test names (zero div error)

crates/nu-cli/tests/commands/math/mod.rs

@@ -87,6 +87,54 @@ fn division_of_ints2() {
     assert_eq!(actual.out, "0.25");
 }
 
+#[test]
+fn error_zero_division_int_int() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            = 1 / 0
+        "#
+    ));
+
+    assert!(actual.err.contains("division by zero"));
+}
+
+#[test]
+fn error_zero_division_decimal_int() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            = 1.0 / 0
+        "#
+    ));
+
+    assert!(actual.err.contains("division by zero"));
+}
+
+#[test]
+fn error_zero_division_int_decimal() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            = 1 / 0.0
+        "#
+    ));
+
+    assert!(actual.err.contains("division by zero"));
+}
+
+#[test]
+fn error_zero_division_decimal_decimal() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            = 1.0 / 0.0
+        "#
+    ));
+
+    assert!(actual.err.contains("division by zero"));
+}
+
 #[test]
 fn proper_precedence_history() {
     let actual = nu!(