add TSamFile and TSamAll command with default keymaps

tests/test_samurai_output_spec.lua

@@ -1,7 +1,7 @@
 local test_samurai = require("test-samurai")
 local core = require("test-samurai.core")
 
-describe("test-samurai output API", function()
+describe("test-samurai public API", function()
   it("delegates show_output to core", function()
     local called = false
     local orig = core.show_output
@@ -16,4 +16,49 @@ describe("test-samurai output API", function()
 
     assert.is_true(called)
   end)
+
+  it("delegates test_nearest to core.run_nearest", function()
+    local called = false
+    local orig = core.run_nearest
+
+    core.run_nearest = function()
+      called = true
+    end
+
+    test_samurai.test_nearest()
+
+    core.run_nearest = orig
+
+    assert.is_true(called)
+  end)
+
+  it("delegates test_file to core.run_file", function()
+    local called = false
+    local orig = core.run_file
+
+    core.run_file = function()
+      called = true
+    end
+
+    test_samurai.test_file()
+
+    core.run_file = orig
+
+    assert.is_true(called)
+  end)
+
+  it("delegates test_all to core.run_all", function()
+    local called = false
+    local orig = core.run_all
+
+    core.run_all = function()
+      called = true
+    end
+
+    test_samurai.test_all()
+
+    core.run_all = orig
+
+    assert.is_true(called)
+  end)
 end)