wrote more of the compressor and added some tests

test/compress/blocks.js

@@ -0,0 +1,49 @@
+remove_blocks: {
+    input: {
+        {;}
+        foo();
+        {};
+        {
+            {};
+        };
+        bar();
+        {}
+    }
+    expect: {
+        foo();
+        bar();
+    }
+}
+
+keep_some_blocks: {
+    input: {
+        // 1.
+        if (foo) {
+            {{{}}}
+            if (bar) baz();
+            {{}}
+        } else {
+            stuff();
+        }
+
+        // 2.
+        if (foo) {
+            for (var i = 0; i < 5; ++i)
+                if (bar) baz();
+        } else {
+            stuff();
+        }
+    }
+    expect: {
+        // 1.
+        if (foo) {
+            if (bar) baz();
+        } else stuff();
+
+        // 2.
+        if (foo) {
+            for (var i = 0; i < 5; ++i)
+                if (bar) baz();
+        } else stuff();
+    }
+}

test/compress/dead-code.js

@@ -0,0 +1,53 @@
+dead_code_1: {
+    options = {
+        dead_code: true
+    };
+    input: {
+        function f() {
+            a();
+            b();
+            x = 10;
+            return;
+            if (x) {
+                y();
+            }
+        }
+    }
+    expect: {
+        function f() {
+            a();
+            b();
+            x = 10;
+            return;
+        }
+    }
+}
+
+dead_code_2_should_warn: {
+    options = {
+        dead_code: true
+    };
+    input: {
+        function f() {
+            g();
+            x = 10;
+            throw "foo";
+            // completely discarding the `if` would introduce some
+            // bugs.  UglifyJS v1 doesn't deal with this issue.
+            if (x) {
+                y();
+                var x;
+                function g(){};
+            }
+        }
+    }
+    expect: {
+        function f() {
+            g();
+            x = 10;
+            throw "foo";
+            var x;
+            function g(){};
+        }
+    }
+}

test/compress/debugger.js

@@ -0,0 +1,24 @@
+keep_debugger: {
+    options = {
+        drop_debugger: false
+    };
+    input: {
+        debugger;
+    }
+    expect: {
+        debugger;
+    }
+}
+
+drop_debugger: {
+    options = {
+        drop_debugger: true
+    };
+    input: {
+        debugger;
+        if (foo) debugger;
+    }
+    expect: {
+        if (foo);
+    }
+}

test/compress/properties.js

@@ -0,0 +1,25 @@
+keep_properties: {
+    options = {
+        properties: false
+    };
+    input: {
+        a["foo"] = "bar";
+    }
+    expect: {
+        a["foo"] = "bar";
+    }
+}
+
+dot_properties: {
+    options = {
+        properties: true
+    };
+    input: {
+        a["foo"] = "bar";
+        a["if"] = "if";
+    }
+    expect: {
+        a.foo = "bar";
+        a["if"] = "if";
+    }
+}

test/compress/sequences.js

@@ -0,0 +1,60 @@
+make_sequences_1: {
+    options = {
+        sequences: true
+    };
+    input: {
+        foo();
+        bar();
+        baz();
+    }
+    expect: {
+        foo(),bar(),baz();
+    }
+}
+
+make_sequences_2: {
+    options = {
+        sequences: true
+    };
+    input: {
+        if (boo) {
+            foo();
+            bar();
+            baz();
+        } else {
+            x();
+            y();
+            z();
+        }
+    }
+    expect: {
+        if (boo) foo(),bar(),baz();
+        else x(),y(),z();
+    }
+}
+
+make_sequences_3: {
+    options = {
+        sequences: true
+    };
+    input: {
+        function f() {
+            foo();
+            bar();
+            return baz();
+        }
+        function g() {
+            foo();
+            bar();
+            throw new Error();
+        }
+    }
+    expect: {
+        function f() {
+            return foo(), bar(), baz();
+        }
+        function g() {
+            throw foo(), bar(), new Error();
+        }
+    }
+}