Add tests for calculator core (elementary#50)

* split meson build file

* add core unit tests

* combine core dependencies into variable

* add test cases for issues and PRs

* add tests for big numbers (commented out)

* add tests for errors

* remove comments

meson.build

@@ -7,28 +7,16 @@ i18n = import('i18n')
 
 add_global_arguments('-DGETTEXT_PACKAGE="io.elementary.calculator"', language:'c')
 
-executable(
-    meson.project_name(),
-    'src/PantheonCalculator.vala',
-    'src/Button.vala',
-    'src/MainWindow.vala',
-    'src/HistoryDialog.vala',
-    'src/Core/Stack.vala',
-    'src/Core/Token.vala',
-    'src/Core/Scanner.vala',
-    'src/Core/Evaluation.vala',
-    dependencies: [
-        dependency('glib-2.0'),
-        dependency('gobject-2.0'),
-        dependency('gtk+-3.0'),
-        dependency('granite'),
-        meson.get_compiler('vala').find_library('posix'),
-        meson.get_compiler('c').find_library('m', required : false)
-    ],
-    install : true
-)
+core_deps = [
+    dependency('glib-2.0'),
+    dependency('gobject-2.0'),
+    meson.get_compiler('vala').find_library('posix'),
+    meson.get_compiler('c').find_library('m', required : false)
+]
 
 meson.add_install_script('meson/post_install.py')
 
 subdir('data')
 subdir('po')
+subdir('src')
+subdir('test')

src/meson.build

@@ -0,0 +1,17 @@
+executable(
+    meson.project_name(),
+    'PantheonCalculator.vala',
+    'Button.vala',
+    'MainWindow.vala',
+    'HistoryDialog.vala',
+    'Core/Stack.vala',
+    'Core/Token.vala',
+    'Core/Scanner.vala',
+    'Core/Evaluation.vala',
+    dependencies: [
+        core_deps,
+        dependency('gtk+-3.0'),
+        dependency('granite')
+    ],
+    install : true
+)

test/CoreTest.vala

@@ -0,0 +1,100 @@
+/*
+* Copyright (c) 2018 elementary LLC. (https://github.com/elementary/calculator)
+*
+* This file is part of Pantheon Calculator
+*
+* Pantheon Calculator is free software: you can redistribute it
+* and/or modify it under the terms of the GNU General Public License as
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* Pantheon Calculator is distributed in the hope that it will be
+* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+* Public License for more details.
+*
+* You should have received a copy of the GNU General Public License along
+* with Pantheon Calculator. If not, see http://www.gnu.org/licenses/.
+*/
+
+class PantheonCalculator.Core.CoreTest : Object {
+    public static int main (string[] args) {
+
+        assert_equal ("0+0", "0");
+        assert_equal ("2+2", "4");
+        assert_equal ("4.23 + 1.11", "5.34");
+
+        assert_equal ("1*1", "1");
+        assert_equal ("11 * 1.1", "12.1");
+        assert_equal ("5 × -1", "-5"); // https://github.com/elementary/calculator/issues/37
+        assert_equal ("5 × -2", "-10"); // https://github.com/elementary/calculator/issues/37
+        assert_equal ("-5 * -1", "5"); // https://github.com/elementary/calculator/issues/37
+        assert_equal ("-5 * -2", "10"); // https://github.com/elementary/calculator/issues/37
+        assert_equal ("-1 / −1", "1"); // https://github.com/elementary/calculator/pull/38/files
+        assert_equal ("144 / 15", "9.6");
+
+        assert_equal ("2^5", "32");
+        assert_equal ("3456^0.5 - sqrt(3456)", "0");
+        assert_equal ("723 mod 5", "3");
+        assert_equal ("2%", "0.02");
+
+        assert_equal ("14E-2", "0.14"); // https://github.com/elementary/calculator/issues/16
+        assert_equal ("1.1E2 - 1E1", "100");
+
+        assert_equal ("pi", "3.141592654");
+        assert_equal ("(π)", "3.141592654");
+        assert_equal ("e", "2.718281828");
+
+        assert_equal ("sqrt(144)", "12");
+        assert_equal ("√423", "20.566963801");
+        assert_equal ("sin(pi ÷ 2)", "1");
+        assert_equal ("sin(-pi)", "0"); // https://github.com/elementary/calculator/issues/1
+        assert_equal ("cos(90)", "-0.448073616");
+        assert_equal ("sinh(2)", "3.626860408");
+        assert_equal ("cosh(2)", "3.762195691");
+
+        assert_equal ("2 + 2 * 2.2", "6.4");
+        assert_equal ("(2 + 2) * 2.2", "8.8");
+        assert_equal ("sin(0.123)^2 + cos(0.123)^2", "1");
+        assert_equal ("tan(0.245) - sin(0.245) / cos(0.245)", "0");
+        assert_equal ("sqrt(5^2 - 4^2)", "3");
+        assert_equal ("sqrt(423) + (3.23 * 8.56) - 1E2", "-51.784236199");
+        assert_equal ("sqrt(-1 + 423 + 1) + (3.23 * 8.56) - sin(90 + 0.2)", "47.428606036");
+        assert_equal ("e^5.25 / exp(5.25)", "1");
+        assert_equal ("exp(log(2.2))", "2.2");
+        assert_equal ("3.141592654*3.141592654", "9.869604404"); // https://github.com/elementary/calculator/issues/7
+        assert_equal ("10 + 5 - 10%", "14.9"); // https://github.com/elementary/calculator/issues/44
+        assert_equal ("10 - 10% + 5", "14.9"); // https://github.com/elementary/calculator/issues/44
+
+        assert_throw ("2+(2", "Mismatched parenthesis.");
+        assert_throw ("2+f", "'f' is invalid.");
+
+        return 0;
+    }
+
+    static void assert_equal (string input, string result) {
+        try {
+            string eval_result = Evaluation.evaluate (input, 0);
+            if (eval_result != result) {
+                error ("%s is %s, but should be %s", input, eval_result, result);
+            }
+        } catch (Error e) {
+            error ("Exception at input %s", input);
+        }
+    }
+
+    static void assert_throw (string input, string message) {
+        Error eval_error = null;
+        try {
+            Evaluation.evaluate (input, 0);
+        } catch (Error e) {
+            eval_error = e;
+        }
+
+        if (eval_error == null) {
+            error ("%s did not throw", input);
+        } else if (eval_error.message != message) {
+            error ("%s did throw %s, but should %s", input, eval_error.message, message);
+        }
+    }
+}

test/meson.build

@@ -0,0 +1,11 @@
+core_test = executable(
+    meson.project_name() + '-test',
+    'CoreTest.vala',
+    meson.source_root() + '/src/Core/Stack.vala',
+    meson.source_root() + '/src/Core/Token.vala',
+    meson.source_root() + '/src/Core/Scanner.vala',
+    meson.source_root() + '/src/Core/Evaluation.vala',
+    dependencies: core_deps
+)
+
+test('Calculator core test', core_test)