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app/service/live/broadcast-proxy/expr/expr_test.go

@@ -0,0 +1,49 @@
+package expr
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestExpr(t *testing.T) {
+	tests := []struct {
+		expr string
+		env  Env
+		want string
+	}{
+		{"$1 > 80 && $2 <9", Env{"$1": 100, "$2": 2}, "true"},
+		{"$1 % 10", Env{"$1": 104, "$2": 2}, "4"},
+		{"pow(x, false) + pow(y, false)", Env{"x": 12, "y": 1}, "2"},
+		{"pow(x, 3) + pow(y, 3)", Env{"x": 9, "y": 10}, "1729"},
+		{"5.0 / 9 * (F - 32)", Env{"F": -40}, "-40"},
+		{"5.0 / 9 * (F - 32)", Env{"F": 32}, "0"},
+		{"5.0 / 9 * (F - 32)", Env{"F": 212}, "100"},
+		////!-Eval
+		//// additional tests that don't appear in the book
+		{"-1 + -x", Env{"x": 1}, "-2"},
+		{"-1 - x", Env{"x": 1}, "-2"},
+		{"a >= 10", Env{"a": 15}, "true"},
+		{"b >= sin(10) && a < 1", Env{"a": 9, "b": 10}, "false"},
+		{"!!!true", Env{"a": 9, "b": 10}, "false"},
+		//!+Eval
+	}
+	var prevExpr string
+	parser := NewExpressionParser()
+	for _, test := range tests {
+		// Print expr only when it changes.
+		if test.expr != prevExpr {
+			t.Logf("\n%s\n", test.expr)
+			prevExpr = test.expr
+		}
+		if err := parser.Parse(test.expr); err != nil {
+			t.Error(err) // parse error
+			continue
+		}
+		got := fmt.Sprintf("%v", parser.GetExpr().Eval(test.env))
+		t.Logf("\t%v => %s\n", test.env, got)
+		if got != test.want {
+			t.Errorf("%s.Eval() in %v = %q, want %q\n",
+				test.expr, test.env, got, test.want)
+		}
+	}
+}