add "js Test Driver" unit tests

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>editor</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>

jsTestDriver.conf

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+
+server: http://localhost:4224
+
+load:
+  - src/*.js
+  - test/*.js

test/MockRenderer.js

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+MockRenderer = function() {
+    this.container = document.createElement("div");
+    this.cursor = {
+        row: 0,
+        column: 0
+    }
+    
+    this.visibleRowCount = 20;
+    
+    this.layerConfig = {
+        firstVisibleRow: 0,
+        lastVisibleRow: this.visibleRowCount,
+    }
+};
+
+
+MockRenderer.prototype.getFirstVisibleRow = function() {
+    return this.layerConfig.firstVisibleRow;
+};
+
+MockRenderer.prototype.getLastVisibleRow = function() {
+    return this.layerConfig.lastVisibleRow;
+};
+
+MockRenderer.prototype.getContainerElement = function() {
+    return this.container;
+};
+
+MockRenderer.prototype.setDocument = function(doc) {
+    this.lines = doc.lines;
+};
+
+MockRenderer.prototype.setTokenizer = function() {
+};
+
+MockRenderer.prototype.updateCursor = function(position) {
+    this.cursor.row = position.row;
+    this.cursor.column = position.column;
+};
+
+MockRenderer.prototype.scrollCursorIntoView = function() {
+    if (this.cursor.row < this.layerConfig.firstVisibleRow) {
+        this.scrollToRow(this.cursor.row);
+    } else if (this.cursor.row > this.layerConfig.lastVisibleRow) {
+        this.scrollToRow(this.cursor.row);
+    }
+};
+
+MockRenderer.prototype.scrollToRow = function(row) {
+    var row = Math.min(this.lines.length - this.visibleRowCount, Math.max(0, row));
+    this.layerConfig.firstVisibleRow = row;
+    this.layerConfig.lastVisibleRow = row + this.visibleRowCount;
+}
+
+
+MockRenderer.prototype.draw = function() {
+};
+

test/NavigationTest.js

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+var NavigationTest = TestCase("NavigationTest", {
+    
+    createTextDocument : function(rows, cols) {
+        var line = new Array(cols+1).join("a");
+        var text = new Array(rows).join(line + "\n") + line;
+        return new ace.TextDocument(text);
+    },
+
+    "test: navigate to end of file should place the cursor on last row and column" : function() {
+        var editor = new ace.Editor(this.createTextDocument(200, 10),
+                new MockRenderer());
+
+        editor.navigateFileEnd();
+        
+        var cursor = editor.getCursorPosition();
+        assertEquals(199, cursor.row);
+        assertEquals(10, cursor.column);
+    },
+    
+    "test: navigate to end of file should scroll the last line into view" : function() {
+        var editor = new ace.Editor(this.createTextDocument(200, 10),
+                                    new MockRenderer());
+
+        editor.navigateFileEnd();
+        var cursor = editor.getCursorPosition();
+        
+        assertTrue(editor.getFirstVisibleRow() <= cursor.row);
+        assertTrue(editor.getLastVisibleRow() >= cursor.row);
+    },
+    
+    "test: navigate to start of file should place the cursor on the first row and column" : function() {
+        var editor = new ace.Editor(this.createTextDocument(200, 10),
+                                    new MockRenderer());
+        
+        editor.navigateFileStart();
+        
+        var cursor = editor.getCursorPosition();
+        assertEquals(0, cursor.row);
+        assertEquals(0, cursor.column);
+    },
+    
+    "test: navigate to start of file should scroll the first row into view" : function() {
+        var editor = new ace.Editor(this.createTextDocument(200, 10),
+                                    new MockRenderer());
+        
+        editor.scrollToRow(editor.getLastVisibleRow() + 20);
+        editor.navigateFileStart();
+        
+        assertEquals(0, editor.getFirstVisibleRow());
+    }    
+});