Add tests for forEach block

test/unit/blocks_control.js

@@ -52,6 +52,72 @@ test('repeatUntil', t => {
     t.end();
 });
 
+test('forEach', t => {
+    const rt = new Runtime();
+    const c = new Control(rt);
+
+    // for each (variable) in "abcd"
+    // ..should yield variable values "a", "b", "c", "d"
+    const variableValues = [];
+    const variable = {value: 0};
+    let value = 'abcd';
+
+    const util = {
+        stackFrame: Object.create(null),
+        target: {
+            lookupOrCreateVariable: function () {
+                return variable;
+            }
+        },
+        startBranch: function () {
+            variableValues.push(variable.value);
+            c.forEach({VARIABLE: {}, VALUE: value}, util);
+        }
+    };
+
+    c.forEach({VARIABLE: {}, VALUE: value}, util);
+    t.deepEqual(variableValues, ['a', 'b', 'c', 'd']);
+
+    // for each (variable) in "5"
+    // ..should yield variable values 1, 2, 3, 4, 5
+    util.stackFrame = Object.create(null);
+    variableValues.splice(0);
+    variable.value = 0;
+    value = '5';
+    c.forEach({VARIABLE: {}, VALUE: value}, util);
+    t.deepEqual(variableValues, [1, 2, 3, 4, 5]);
+
+    // for each (variable) in 4
+    // ..should yield variable values 1, 2, 3, 4
+    util.stackFrame = Object.create(null);
+    variableValues.splice(0);
+    variable.value = 0;
+    value = 4;
+    c.forEach({VARIABLE: {}, VALUE: value}, util);
+    t.deepEqual(variableValues, [1, 2, 3, 4]);
+
+    // for each (variable) in 10:
+    //   if variable % 4 === 3:
+    //     variable++
+    // ..should yield variable values 1, 2, 3,  5, 6, 7,  9, 10
+    // (this script skips multiples of 4)
+    util.stackFrame = Object.create(null);
+    variableValues.splice(0);
+    variable.value = 0;
+    value = 10;
+    util.startBranch = function () {
+        variableValues.push(variable.value);
+        if (variable.value % 4 === 3) {
+            variable.value++;
+        }
+        c.forEach({VARIABLE: {}, VALUE: value}, util);
+    };
+    c.forEach({VARIABLE: {}, VALUE: value}, util);
+    t.deepEquals(variableValues, [1, 2, 3, 5, 6, 7, 9, 10]);
+
+    t.end();
+});
+
 test('forever', t => {
     const rt = new Runtime();
     const c = new Control(rt);