a lot of refactoring and re-implementing tests for FunctionEntry

src/consts.rs

@@ -0,0 +1,29 @@
+use crate::function::Riemann;
+use std::ops::RangeInclusive;
+
+// Hard-Coded limits
+
+/// Range of acceptable input values for integral_num
+pub const INTEGRAL_NUM_RANGE: RangeInclusive<usize> = 1..=50000;
+/// Minimum X value for calculating an Integral
+pub const INTEGRAL_X_MIN: f64 = -1000.0;
+/// Maximum X value for calculating an Integral
+
+pub const INTEGRAL_X_MAX: f64 = 1000.0;
+/// Range of acceptable x coordinates for calculating an integral
+pub const INTEGRAL_X_RANGE: RangeInclusive<f64> = INTEGRAL_X_MIN..=INTEGRAL_X_MAX;
+
+// Default values
+
+/// Default Riemann Sum to calculate
+pub const DEFAULT_RIEMANN: Riemann = Riemann::Left;
+
+/// Default minimum X value to display
+pub const DEFAULT_MIN_X: f64 = -10.0;
+
+/// Default Maxmimum X value to display
+
+pub const DEFAULT_MAX_X: f64 = 10.0;
+
+/// Default number of integral boxes
+pub const DEFAULT_INTEGRAL_NUM: usize = 100;