added lox test files

lox.t/number/decimal_point_at_eof.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at end: Expect property name after '.'.
+123.

lox.t/number/leading_dot.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at '.': Expect expression.
+.123;

lox.t/number/literals.lox

@@ -0,0 +1,7 @@
+print 123;     // expect: 123
+print 987654;  // expect: 987654
+print 0;       // expect: 0
+print -0;      // expect: -0
+
+print 123.456; // expect: 123.456
+print -0.001;  // expect: -0.001

lox.t/number/nan_equality.lox

@@ -0,0 +1,8 @@
+var nan = 0/0;
+
+print nan == 0; // expect: false
+print nan != 1; // expect: true
+
+// NaN is not equal to self.
+print nan == nan; // expect: false
+print nan != nan; // expect: true

lox.t/number/trailing_dot.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at ';': Expect property name after '.'.
+123.;