1 files changed, 95 insertions, 0 deletions
diff --git a/calculator_test.go b/calculator_test.go
new file mode 100644
index 0000000..89eeea1
--- /dev/null
+++ b/calculator_test.go
@@ -0,0 +1,95 @@
+// Copyright (c) 2020 Alexander Kiryukhin <a.kiryukhin@mail.ru>
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package executor
+
+import "testing"
+
+func TestCalc(t *testing.T) {
+	funcs := []*Function{
+		NewFunction("negative", func(args ...float64) (f float64, err error) {
+			return -args[0], nil
+		}, 1),
+		NewFunction("sum", func(args ...float64) (f float64, err error) {
+			return args[0] + args[1], nil
+		}, 2),
+	}
+	operators := []*Operator{
+		NewOperator("==", 1, LeftAssoc, func(a, b float64) (float64, error) {
+			if a == b {
+				return 1, nil
+			}
+			return 0, nil
+		}),
+	}
+	tests := []struct {
+		name       string
+		expression string
+		expected   float64
+		vars       map[string]float64
+		funcs      []*Function
+		operators  []*Operator
+	}{
+		{"simple", "((15/(7-(1+1)))*-3)-(-2+(1+1))", ((15.0 / (7.0 - (1.0 + 1.0))) * -3.0) - (-2.0 + (1.0 + 1.0)), nil, nil, nil},
+		{"variables", "a+b*c", 14.0, map[string]float64{"a": 2.0, "b": 3.0, "c": 4.0}, nil, nil},
+		{"functions 1 arg", "negative(10)", -10.0, nil, funcs, nil},
+		{"functions 2 arg", "negative(sum(10, 20)+20)", -50.0, nil, funcs, nil},
+		{"custom operator", "10 == 10", 1, nil, nil, operators},
+		{"custom operator 2", "10 == 12", 0, nil, nil, operators},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			c := NewCalc()
+			c.AddOperators(MathOperators)
+			if test.funcs != nil {
+				c.AddFunctions(test.funcs)
+			}
+			if test.operators != nil {
+				c.AddOperators(test.operators)
+			}
+			if err := c.Prepare(test.expression); err != nil {
+				t.Error(err)
+			}
+			actual, err := c.Execute(test.vars)
+			if err != nil {
+				t.Error(err)
+			}
+			if actual != test.expected {
+				t.Errorf("Expected %f, actual %f", test.expected, actual)
+			}
+		})
+	}
+}
+
+func TestCalc2(t *testing.T) {
+	c := NewCalc()
+	c.AddOperators(MathOperators)
+	if err := c.Prepare("((15/(7-(1+1)))*-3)-(-2+(1+1))"); err != nil {
+		t.Error(err)
+	}
+	actual, err := c.Execute(nil)
+	if err != nil {
+		t.Error(err)
+	}
+	expected := ((15.0 / (7.0 - (1.0 + 1.0))) * -3.0) - (-2.0 + (1.0 + 1.0))
+	if actual != expected {
+		t.Errorf("Expected %f, actual %f", expected, actual)
+	}
+}