initialize with first MVP

tests/test_samurai_core_spec.lua

@@ -0,0 +1,26 @@
+local test_samurai = require("test-samurai")
+local core = require("test-samurai.core")
+
+describe("test-samurai core", function()
+  before_each(function()
+    test_samurai.setup()
+  end)
+
+  it("selects Go runner for _test.go files", function()
+    local bufnr = vim.api.nvim_create_buf(false, true)
+    vim.api.nvim_buf_set_name(bufnr, "/tmp/foo_test.go")
+    local runner = core.get_runner_for_buf(bufnr)
+    assert.is_not_nil(runner)
+    assert.equals("go", runner.name)
+  end)
+
+  it("selects JS jest runner for *.test.ts files", function()
+    local bufnr = vim.api.nvim_create_buf(false, true)
+    vim.api.nvim_buf_set_name(bufnr, "/tmp/foo.test.ts")
+    vim.bo[bufnr].filetype = "typescript"
+
+    local runner = core.get_runner_for_buf(bufnr)
+    assert.is_not_nil(runner)
+    assert.equals("js-jest", runner.name)
+  end)
+end)