added GT, GTE, LT, LTE (#54)

* added GT, GTE, LT, LTE

* GTE -> GreaterThanOrEqual

decimal.go

@@ -423,6 +423,28 @@ func (d Decimal) Equals(d2 Decimal) bool {
 	return d.Equal(d2)
 }
 
+// Greater Than (GT) returns true when d is greater than d2.
+func (d Decimal) GreaterThan(d2 Decimal) bool {
+	return d.Cmp(d2) == 1
+}
+
+// Greater Than or Equal (GTE) returns true when d is greater than or equal to d2.
+func (d Decimal) GreaterThanOrEqual(d2 Decimal) bool {
+	cmp := d.Cmp(d2)
+	return cmp == 1 || cmp == 0
+}
+
+// Less Than (LT) returns true when d is less than d2.
+func (d Decimal) LessThan(d2 Decimal) bool {
+	return d.Cmp(d2) == -1
+}
+
+// Less Than or Equal (LTE) returns true when d is less than or equal to d2.
+func (d Decimal) LessThanOrEqual(d2 Decimal) bool {
+	cmp := d.Cmp(d2)
+	return cmp == -1 || cmp == 0
+}
+
 // Sign returns:
 //
 //	-1 if d <  0

decimal_test.go

@@ -1322,18 +1322,53 @@ func TestDecimal_Abs2(t *testing.T) {
 	}
 }
 
-func TestDecimal_Equal(t *testing.T) {
+func TestDecimal_Equalities(t *testing.T) {
 	a := New(1234, 3)
 	b := New(1234, 3)
+	c := New(1234, 4)
 
 	if !a.Equal(b) {
 		t.Errorf("%q should equal %q", a, b)
 	}
+	if a.Equal(c) {
+		t.Errorf("%q should not equal %q", a, c)
+	}
 
-	// note, this should be deprecated, here for backwards compatibility
+	// note, this block should be deprecated, here for backwards compatibility
 	if !a.Equals(b) {
 		t.Errorf("%q should equal %q", a, b)
 	}
+
+	if !c.GreaterThan(b) {
+		t.Errorf("%q should be greater than  %q", c, b)
+	}
+	if b.GreaterThan(c) {
+		t.Errorf("%q should not be greater than  %q", b, c)
+	}
+	if !a.GreaterThanOrEqual(b) {
+		t.Errorf("%q should be greater or equal %q", a, b)
+	}
+	if !c.GreaterThanOrEqual(b) {
+		t.Errorf("%q should be greater or equal %q", c, b)
+	}
+	if b.GreaterThanOrEqual(c) {
+		t.Errorf("%q should not be greater or equal %q", b, c)
+	}
+	if !b.LessThan(c) {
+		t.Errorf("%q should be less than %q", a, b)
+	}
+	if c.LessThan(b) {
+		t.Errorf("%q should not be less than  %q", a, b)
+	}
+	if !a.LessThanOrEqual(b) {
+		t.Errorf("%q should be less than or equal %q", a, b)
+	}
+	if !b.LessThanOrEqual(c) {
+		t.Errorf("%q should be less than or equal  %q", a, b)
+	}
+	if c.LessThanOrEqual(b) {
+		t.Errorf("%q should not be less than or equal %q", a, b)
+	}
 }
 
 func TestDecimal_ScalesNotEqual(t *testing.T) {