config init now leaves out the test sources unless given --all

A section tagged init:"hidden" isn't written to the file config init
generates; fts_mock and sleeper are. config init --all writes them too.
They still load, and the config commands read and set them as before.

internal/cli/config/config_test.go

@@ -214,6 +214,32 @@ func TestConfigInit(t *testing.T) {
 	}
 }
 
+// The test sources are left out of the file unless --all is given.
+func TestConfigInitTestSources(t *testing.T) {
+	cmdtest.Setup(t, "")
+
+	mustRun(t, "config", "init", "./default.yaml")
+	written := cmdtest.ReadFile(t, "default.yaml")
+	cmdtest.Contains(t, written, "find_a_tender:", "eu_supply:")
+	for _, hidden := range []string{"fts_mock", "sleeper"} {
+		if strings.Contains(written, hidden) {
+			t.Errorf("init wrote %s without --all:\n%s", hidden, written)
+		}
+	}
+
+	mustRun(t, "config", "init", "--all", "./all.yaml")
+	cmdtest.Contains(
+		t, cmdtest.ReadFile(t, "all.yaml"), "fts_mock:", "sleeper:",
+	)
+
+	// The test sources still load and are set as usual.
+	mustRun(
+		t, "--config", "default.yaml",
+		"config", "set", "sources.sleeper.enabled", "true",
+	)
+	cmdtest.Contains(t, cmdtest.ReadFile(t, "default.yaml"), "sleeper:")
+}
+
 // With no path (or a blank one), init searches the default locations. The
 // working directory is one, so its config.yaml is found. (Not finding one
 // would write to /etc/job-search, which a test can't do.)