Reorganize tests.

test/function/equality.wren

@@ -0,0 +1,16 @@
+// Not structurally equal.
+io.write((fn 123) == (fn 123))  // expect: false
+io.write((fn 123) != (fn 123))  // expect: true
+
+// Not equal to other types.
+io.write((fn 123) == 1)         // expect: false
+io.write((fn 123) == false)     // expect: false
+io.write((fn 123) == "fn 123")  // expect: false
+io.write((fn 123) != 1)         // expect: true
+io.write((fn 123) != false)     // expect: true
+io.write((fn 123) != "fn 123")  // expect: true
+
+// Equal by identity.
+var f = fn 123
+io.write(f == f) // expect: true
+io.write(f != f) // expect: false

test/function/parameters.wren

@@ -0,0 +1,26 @@
+var f0 = fn 0
+io.write(f0.call) // expect: 0
+
+var f1 = fn(a) a
+io.write(f1.call(1)) // expect: 1
+
+var f2 = fn(a, b) a + b
+io.write(f2.call(1, 2)) // expect: 3
+
+var f3 = fn(a, b, c) a + b + c
+io.write(f3.call(1, 2, 3)) // expect: 6
+
+var f4 = fn(a, b, c, d) a + b + c + d
+io.write(f4.call(1, 2, 3, 4)) // expect: 10
+
+var f5 = fn(a, b, c, d, e) a + b + c + d + e
+io.write(f5.call(1, 2, 3, 4, 5)) // expect: 15
+
+var f6 = fn(a, b, c, d, e, f) a + b + c + d + e + f
+io.write(f6.call(1, 2, 3, 4, 5, 6)) // expect: 21
+
+var f7 = fn(a, b, c, d, e, f, g) a + b + c + d + e + f + g
+io.write(f7.call(1, 2, 3, 4, 5, 6, 7)) // expect: 28
+
+var f8 = fn(a, b, c, d, e, f, g, h) a + b + c + d + e + f + g + h
+io.write(f8.call(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36

test/function/syntax.wren

@@ -0,0 +1,33 @@
+// Single expression body.
+(fn io.write("ok")).call // expect: ok
+
+// TODO(bob): Precedence of fn body.
+
+// Curly body.
+fn {
+  io.write("ok") // expect: ok
+}.call
+
+// No trailing newline.
+fn {
+  io.write("ok") }.call // expect: ok
+
+// Multiple expressions.
+fn {
+  io.write("1") // expect: 1
+  io.write("2") // expect: 2
+}.call
+
+// Extra newlines.
+fn {
+
+
+  io.write("1") // expect: 1
+
+
+  io.write("2") // expect: 2
+
+
+}.call
+
+// TODO(bob): Arguments.

test/function/type.wren

@@ -0,0 +1,4 @@
+io.write((fn 0) is Function)      // expect: true
+io.write((fn 0) is Object)        // expect: true
+io.write((fn 0) is String)        // expect: false
+io.write((fn 0).type == Function) // expect: true