packer: test Build

packer/core_test.go

@@ -48,6 +48,36 @@ func TestCoreBuildNames(t *testing.T) {
 	}
 }
 
+func TestCoreBuild_basic(t *testing.T) {
+	config := TestCoreConfig(t)
+	testCoreTemplate(t, config, fixtureDir("build-basic.json"))
+	b := TestBuilder(t, config, "test")
+	core := TestCore(t, config)
+
+	b.ArtifactId = "hello"
+
+	build, err := core.Build("test")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if _, err := build.Prepare(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	artifact, err := build.Run(nil, nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if len(artifact) != 1 {
+		t.Fatalf("bad: %#v", artifact)
+	}
+
+	if artifact[0].Id() != b.ArtifactId {
+		t.Fatalf("bad: %s", artifact[0].Id())
+	}
+}
+
 func TestCoreValidate(t *testing.T) {
 	cases := []struct {
 		File string
@@ -110,3 +140,12 @@ func testComponentFinder() *ComponentFinder {
 		Provisioner:   provFactory,
 	}
 }
+
+func testCoreTemplate(t *testing.T, c *CoreConfig, p string) {
+	tpl, err := template.ParseFile(p)
+	if err != nil {
+		t.Fatalf("err: %s\n\n%s", p, err)
+	}
+
+	c.Template = tpl
+}

packer/test-fixtures/build-basic.json

+{
+    "builders": [{
+        "type": "test"
+    }]
+}

packer/testing.go

@@ -42,3 +42,19 @@ func TestCore(t *testing.T, c *CoreConfig) *Core {
 
 	return core
 }
+
+// TestBuilder sets the builder with the name n to the component finder
+// and returns the mock.
+func TestBuilder(t *testing.T, c *CoreConfig, n string) *MockBuilder {
+	var b MockBuilder
+
+	c.Components.Builder = func(actual string) (Builder, error) {
+		if actual != n {
+			return nil, nil
+		}
+
+		return &b, nil
+	}
+
+	return &b
+}